EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/
EVAL-AD7986FMCZ User Guide
UG-727
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the AD7944/AD7985/AD7986 14-/16-/18-Bit, PulSAR ADCs
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 31
FEATURES
Full featured evaluation board for the
AD7944/AD7985/AD7986
Versatile analog signal conditioning circuitry
On-board reference, reference buffers, and ADC drivers
System demonstration board compatible (EVAL-SDP-CH1Z)
PC software for control and data analysis of time and
frequency domain
EVALUATION KIT CONTENTS
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ
evaluation board
ADDITIONAL EQUIPMENT AND SOFTWARE
System demonstration platform (EVAL-SDP-CH1Z)
Precision source
World-compatible, 12 V dc supply adapter
(included with EVAL-SDP-CH1Z)
Power supply, +7.5 V/−3.0 V (optional)
USB cable
SMA cable
ONLINE RESOURCES
Documents Needed
AD7944, AD7985, and AD7986 data sheet
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/
EVAL-AD7986FMCZ user guide
Required Software
AD7944/AD7985/AD7986 evaluation software
Design and Integration Files
Schematics, layout files, bill of materials
GENERAL DESCRIPTION
The EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/
EVAL-AD7986FMCZ are evaluation boards designed to
demonstrate the low power performance of the AD7944/
AD7985/AD7986 14-/16-/18-bit, PulSAR® analog-to-digital
converters (ADCs) and to provide an easy to understand
interface for a variety of system applications. Full descriptions
of the AD7944, AD7985, and AD7986 are available in the
respective product data sheets, which should be consulted in
conjunction with this user guide when using these evaluation
boards.
The user PC software controls the evaluation board over the USB
cable through the Analog Devices, Inc., system demonstration
platform (SDP) board, the EVAL-SDP-CH1Z.
On-board components include the following:
The ADR3412/ADR4525/ADR4550 high precision,
buffered band gap, 1.2 V/2.048 V/5.0 V reference options
The AD8031 reference buffer
The ADA4899-1/ADA4897-1/AD8021 signal conditioning
circuit with three op amps and an option to use a
differential amplifier (AD8139)
The ADP7118, ADM7160, ADP2370, and ADP7182
regulators to derive necessary voltage levels on board
The EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/
EVAL-AD7986FMCZ evaluation boards interface to the
EVAL-SDP-CH1Z SDP board via a 160-pin FMC connector.
SMA connectors, JP1/JP4 and JP2/JP5, are provided for the
low noise analog signal source.
TYPICAL EVALUATION SETUP
TO 12V WALL WART
PC
SI G NAL SOURCE SMA
CONNECTOR
USB
12476-001
Figure 1.
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TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents ................................................................... 1
Additional Equipment and Software ............................................. 1
Online Resources .............................................................................. 1
General Description ......................................................................... 1
Typical Evaluation Setup ................................................................. 1
Revision History ............................................................................... 2
Functional Block Diagram .............................................................. 3
Evaluation Board Hardware ............................................................ 4
Device Description ....................................................................... 4
Hardware Link Options ............................................................... 4
Power Supplies .............................................................................. 4
Serial Interface .............................................................................. 6
Analog Inputs ................................................................................ 6
Reference Options ........................................................................ 6
Layout Guidelines ......................................................................... 7
Basic Hardware Setup ...................................................................7
Evaluation Board Software ...............................................................8
Software Installation .....................................................................8
Launching the Software ............................................................. 10
Software Operation .................................................................... 11
WaveForm Capture .................................................................... 13
DC Testing—Histogram ............................................................ 14
AC Testing—Histogram ............................................................ 14
AC Testing—FFT Capture ........................................................ 15
Summary Tab .............................................................................. 16
Troubleshooting .............................................................................. 17
Software ....................................................................................... 17
Hardware ..................................................................................... 17
Evaluation Board Schematics and Artwork ................................ 18
Bill of Materials ............................................................................... 25
REVISION HISTORY
7/15—Revision 0: Initial Version
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FUNCTIONAL BLOCK DIAGRAM
–V
S
–V
S
= –3V
–V
S
+7.5V
GND
IN+
VIN+
VIN–
IN–
AD7944/AD7985/AD7986
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ EVAL-SDP-CH1Z
–V
S
+7.5V
AD8031
LVCMOS
INTERFACE
160-PIN
10mm
VITA 57 CO NNE CTOR
REFREFIN AVDD DVDD VIO
CNV
SCK
SDO
TURBO
ADR4550
+7.5V
+7.5V
+5V
+5V
AD8031
+5V +12V
+12V
+12V
WAL L W ART
USB PO RT
+2.5V
ADA4899-1
ADA4899-1
VCM
ADM7160
ADP7118
ADP2370ADP7118
POWER
SUPPLY
CIRCUITRY
ADSP-BF527
SPARTAN-6
FPGA
XC6SLX25
+5V
SDI
+7.5V
12476-002
Figure 2.
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EVALUATION BOARD HARDWARE
DEVICE DESCRIPTION
The AD7944 is a 14-bit, 2.5 MSPS successive approximation
(SAR) ADC. The AD7985 is a 16-bit, 2.5 MSPS SAR ADC. The
AD7986 is an 18-bit, 2 MSPS SAR ADC.
These ADCs are low power and high speed and include an
internal conversion clock, an internal reference (and buffer),
error correction circuits, and a versatile serial interface port. On
the rising edge of CNV, each ADC samples an analog input, IN+,
between 0 V and REF with respect to the ground sense, IN−.
The ADCs feature a very high sampling rate turbo mode
(TURBO is high) and a reduced power normal mode (TURBO
is low) for low power applications where the power is scaled
with the throughput.
Full descriptions of the AD7944, AD7985, and AD7986 are
available in the respective product data sheets, which should be
consulted in conjunction with this user guide when using the
evaluation boards. Full details on the E VA L -SDP-CH1Z are
available at the SDP board product page.
HARDWARE LINK OPTIONS
The default link settings and the functions of the link options
are shown in Table 1.
POWER SUPPLIES
The power (12 V) for the E VA L -AD7944FMCZ/E VA L -
AD7985FMCZ/E VA L-AD7986FMCZ evaluation boards comes
through a 160-pin FMC connector, J7, from the E VA L -SDP-
CH1Z. The user also has the option of using an external 12 V
supply to power the evaluation board. On-board regulators
generate the required levels from the applied 12 V rail. The
ADP7118 (U18) supplies 7.5 V for the +VS pin of the ADC
driver amplifiers (ADA4899-1, ADA4897-1, or AD8021), the
external reference ADR4550 (U5), the ADR4525 (U8), and the
ADR3412. Another ADP7118 (U10) supplies 5 V for BVDD
(U1), the ADP2370 (U2), and the ADM7160 (U3 and U12).
The ADP2370 (U2), in turn, directly generates −3.0 V or
connects to the ADP7182 to generate −2.5 V for the −VS pin of
the amplifier. The ADM7160 (U3 and U12) provides 2.5 V for
DVDD and VIO (U1). The user also can use external bench top
supplies to power the on-board amplifiers. The 3.3 V supply for
the EEPROM (U7) comes from the E VA L-SDP-CH1Z through
a 160-pin FMC connector, J7. Each supply is decoupled where it
enters the board and again at each device. A single ground
plane is used on this board to minimize the effect of high
frequency noise interference.
Table 1. Pin Jumper Descriptions
Link Default Purpose
JP1, JP2 B to center Connects analog inputs VIN+ and VIN− to the inputs of the ADC driver ADA4899-1, ADA4897-1, or AD8021. The
A to center position sets the fully differential path through the AD8139.
JP3, JP4 B to center Connects the outputs from the ADA4899-1 to the inputs of the ADC. The A to center position sets the fully
differential path.
JP5 A to center Connects the VCM output from the ADR4550 to the VCM buffer AD8031.
JP6 B to center Connects 2.5 V to the ADC AVDD (analog core) supply. To prevent permanent damage to the ADC, do not
connect this supply to supplies >2.5 V.
JP7 ADC specific Single or differential ADC input selection. The AD7986 default position is B to center. The AD7944 and AD7985
default position is A to center.
JP8 B to center Connects 7.5 V to amplifier +VS.
JP9 B to center Connects −3.0 V to amplifier −VS.
JP10 B to center Connects 5 V to ADC BVDD. For an external reference, the best performance is obtained when the reference
source that is connected to the REF pins and BVDD are the same. Used in conjunction with LK3.
JP11 B to center Connects 2.5 V to ADC DVDD (digital core) supply. To prevent permanent damage to the ADC, do not connect
this supply to supplies >2.5 V.
JP12 B to center Connects 2.5 V to the ADC digital input/output supply.
LK1 B Option to use external 12 V power supply or +12V_FMC power from the EVAL-SDP-CH1Z.
LK2 REFIN to GND Selects the internal reference and/or the reference buffer. Used in conjunction with LK10 and LK3.
LK3 Not inserted Option to connect REF with BVDD.
LK4 B Connects to the 7.5 V supply coming from the ADP7118.
LK5 B Connects to the −3.0 V supply coming from the ADP2370.
LK6 B Connects the VCM to VCM buffer AD8031.
LK7 A Connects the +5 V output from the ADR4550 to generate the REF buffer AD8031.
LK8
A to B
Connects the SDO pin of the ADC to the level shifter pin.
LK9, LK11,
LK12, LK13
B to center Connect the TURBO, SDI, CNV, and SCK pins of the ADC to level shifter pins. The A to center position bypasses the
level shifter. To prevent different voltage level damage to the ADC, the B to center position is recommended.
LK10 A Selection of either the internal reference of the ADC or an external reference.
LK16 B Connects −NEG with the −3.0 V supply coming from the ADP2370. The A to center position connects with ADP7182.
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Table 2. On-Board Connectors
Connector Function
J1, J2, J4, J5 SMA analog input. Connects the low noise analog signal source to the inputs of the ADC driver ADA4899-1, ADA4897-1,
AD8021, or AD8139.
J3 3-pin terminal. This option is for using external bench top supplies. Apply external +Vs, −Vs, and GND to power amplifiers on
the EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ evaluation board.
J6 6-pin (2 × 3) socket. This option is for interfacing with an external ADC driver board.
J7 160-pin FMC 10 mm male VITA 57 connector. This connector mates with the EVAL-SDP-CH1Z board.
J8, J9 7-pin (1 × 7) header connector. This option is for using an external ADC driver board.
J10 6-pin (1 × 6) header connector. This option is for using an external serial interface to control the ADC.
Table 3. On-Board Power Supplies Description
Power
Supply
Voltage
Range (V) Purpose
+VS +5 to +7.5 The two ADP7118 devices (U10, U18) generate the necessary 5 V and 7.5 V supplies, respectively, from the 12 V
supply coming from the EVAL-SDP-CH1Z, or from external power supply. The 7.5 V supply is recommended for
the on-board amplifier +VS. The 5 V supply is provided to AVDD (U1), the ADP2370 (U2), the
ADR4525/ADR4550/ADR3412 (U5, U8, and U13), and the ADM7160 (U3 and U12). The user also has the option
to use an external bench top supply for +VS through J3.
−VS −2 to −5 The ADP2370 generates −3.0 V or connects to the ADP7182 to generate −2.5 V for the −VS pin of the amplifier.
The user also has the option to use an external bench top supply for −VS through J3.
|+VS to −VS| 12 Maximum range of supply for correct operation.1
AVDD 5 Analog supply rail (U1).2
DVDD2, VIO 2.5 ADC supply rails.2
1 Dictated by ADA4899-1 supply operation.
2 Refer to the AD7944, AD7985, and AD7986 data sheets.
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SERIAL INTERFACE
The E VA L -AD7944FMCZ/EVAL -AD7985FMCZ/E VA L -
AD7986FMCZ evaluation boards use the serial interface
connection to the E VA L-SDP-CH1Z. The EVA L -AD7944FMCZ/
E VA L-AD7985FMCZ/E VA L -AD7986FMCZ have two different
data reading options: read during conversion and read during
acquisition, both of which can operate in 3-wire and 4-wire
serial interface modes. When using the serial interface, the
voltage level shifter option and the external compatible serial
interface options are supported. The serial interface requires
five pins (SDI, SCK, SDO, TURBO, and CNV) connected
between each ADC and the digital host.
The E VA L-SDP-CH1Z board features include the following:
• XILINX Spartan®-6 FPGA
• DDR2
• Micron MT47H32M16Hr-25E:G
8 Mb × 16 bits × 4 Banks(512 Mb/64 Mb)
• SRAM
• ISSI IS61WV25616BLL-10BLI
256 kB × 16 bits (4 Mb/512 kB)
• 1 × 160-pin FMC-LPC connector (refer to the VITA 57
specification)
• Samtec ASP-134603-01
• Up to 1080 Mbps LVDS
• Single-ended LVCMOS
• Power
• Analog Devices ADSP-BF527 Blackfin® processor
• Core performance up to 600 MHz
• 208-ball CSP-BGA package
• 24 MHz CLKIN oscillator
• 32 Mb flash memory
• Numonyx M29W320EB or Numonyx M25P32
• SDRAM memory
• Micron MT48LC16M16A2P-6A
16 Mb × 16 bits (256 Mb/32 MB)
• 2 × 120-pin small foot print connectors
• Hirose FX8-120P-SV1(91), 120-pin header
• Blackfin processor peripherals exposed
• SPI
• SPORT
• TWI/I2C
• GPIO
• PPI
• Asynchronous parallel
ANALOG INPUTS
The analog inputs applied to the E VA L -AD7944FMCZ/E VA L -
AD7985FMCZ/E VA L-AD7986FMCZ evaluation boards are the
J1 and J2 SMA (push on) connectors. These inputs are buffered
with dedicated, discrete driver amplifier circuitry (U15 and U16
or U14), as shown in Figure 1.
The circuit allows different configurations, input range scaling,
filtering, the addition of a dc component, the use of a different
op amp, and a differential amplifier and supplies. The analog
input amplifiers are set as unity-gain buffers at the factory. The
positive rails of the driver amplifiers (U14, U15, and U16) are
driven from 7.5 V (from the ADP7118, U18), and the negative
rails are driven from −3.0 V. The positive rails of the other reference
buffers (U4 and U11) are driven from 7.5 V, and the negative
rails are grounded; these rails can be changed as required. The
range of possible supplies is listed in Table 3. The default
configuration sets both U15 and U16 at midscale generated
from a buffered reference voltage (VCM) of the ADR4550 (U5).
The evaluation board is factory configured to provide either a
single-ended path or a fully differential path, as described in
Table 1. Because the AD7986 is differential, both inputs and
amplifier circuits are used to buffer the IN+ and IN− inputs of
the ADCs. For the AD7944 and the AD7985 evaluation boards,
only the J2, U15, and associated circuitry are used in the path.
For dynamic performance, an FFT test can be performed by
applying a very low distortion source. For low frequency testing,
use the audio precision source. Set the outputs for balanced and
floating. Different sources can be used, though most are single-
ended and use a fixed output resistance.
Because the evaluation board uses the amplifiers in unity gain,
the noninverting input has a common-mode input with a series
590 Ω resistor, which must be taken into account when directly
connecting a source (voltage divider).
REFERENCE OPTIONS
The AD7944, AD7985, and AD7986 each have an internal
4.096 V reference together with an internal buffer that can be
used with an external reference; the devices can also use an
external 5.0 V or 2.048 V reference directly. The E VA L -
AD7944FMCZ/ E VA L-AD7985FMCZ/E VA L-AD7986FMCZ
evaluation boards can be configured to use any of these
references. The jumpers and linkers used to set the reference are
shown in Table 1.
External Reference: Default Configuration
The E VA L -AD7944FMCZ/EVAL -AD7985FMCZ/E VA L -
AD7986FMCZ evaluation boards include an external 5 V and
2.048 V reference. This reference can drive the ADCs and the
REF pin directly, or it can be buffered with the AD8031; the
factory default setting is 5 V and buffered with the AD8031.
The best attainable signal-to-noise ratio (SNR) is achieved by
using the maximum reference voltage of 5 V. Refer to the
AD7944, AD7985, and AD7986 data sheets for more details.
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Internal 4.096 V Reference
The AD7944/AD7985/AD7986 ADCs have an internal 4.096 V
precision reference that can be used on most applications.
Connecting PDREF to GND enables the internal reference. When
the internal reference is enabled, a 4.096 V as well as a 1.2 V band
gap are present on the ADC REF pin and test point. When using
this method, R14 and R17 must be removed to achieve the best
performance. External sources must not be connected to these
test points because they are directly connected to the ADC pins.
Internal Reference Buffer
The internal reference buffer is useful when using an external 1.2 V
reference. When using the internal reference buffer, applying 1.2 V
reference ADR3412 (U13) to REFIN, which is directly connected
to the REFIN pin of the ADC, produces 4.096 V at the REF pin of
the ADC. R14 and R17 must be removed to achieve the best
performance. External sources must not be connected to these
test points because they are directly connected to the ADC pins.
LAYOUT GUIDELINES
When laying out the printed circuit board (PCB) for the ADC,
follow these recommended guidelines to obtain the maximum
performance from the converter.
• Solder the ADC exposed paddle (Pin 21) directly to the
PCB, and connect the paddle to the ground plane of the
board using multiple vias.
• Decouple all the power supply pins (AVDD, BVDD, and
VIO) and the REF pin with low ESR and low ESL ceramic
capacitors, typically 10 µF and 100 nF, placed close to the
DUT (U1) and connected using short, wide traces. This
provides low impedance paths and reduces the effect of
glitches on the power supply lines.
• The ADC voltage reference inputs (REF) have a dynamic
input impedance and must be decoupled with minimal
parasitic inductances, by placing the reference decoupling
ceramic capacitor close to, ideally right up against, the REF
and REFGND pins and connecting them with wide, low
impedance traces.
• Separate analog and digital sections and keep power supply
circuitry away from the ADC.
• Avoid running digital lines under the device as well as
crossover of digital and analog signals, because these
couple noise into the ADC.
• Do not run fast switching signals, such as CNV or clocks,
near analog signal paths.
• Remove the ground and power plane beneath the input
(including feedback) and output pins of the amplifiers (U14,
U15, and U16), because they create an undesired capacitor.
BASIC HARDWARE SETUP
The E VA L -AD7944FMCZ/EVAL -AD7985FMCZ/E VA L -
AD7986FMCZ evaluation boards connect to the (E VA L-SDP-
CH1Z) system demonstration board. The E VA L -SDP-CH1Z
board is the controller board, which is the communication link
between the PC and the main evaluation board.
Figure 1 shows a photograph of the connections between the
E VA L-AD7944FMCZ/E VA L -AD7985FMCZ/E VA L -
AD7986FMCZ daughter board and the E VA L-SDP-CH1Z
controller board.
1. Install the E VA L-AD7944FMCZ/E VA L-AD7985FMCZ/
E VA L-AD7986FMCZ software. Ensure that the E VA L-
SDP-CH1Z board is disconnected from the USB port of
the PC while installing the software. The PC must be
restarted after the installation.
2. Before connecting power, connect the 160-pin FMC
connector, J7, of the evaluation board to the J4 connector
on the E VA L-SDP-CH1Z board. Nylon screws are included
in the E VA L -AD7944FMCZ/EVA L-AD7985FMCZ/E VA L-
AD7986FMCZ evaluation kit and can be used to ensure
the that the evaluation board and the E VA L -SDP-CH1Z
board are connected firmly together.
3. Connect the 12 V power supply adapter included in the kit
to the E VA L -SDP-CH1Z.
4. Connect the E VA L -SDP-CH1Z board to the PC via the
USB cable. Windows XP users may need to search for the
E VA L-SDP-CH1Z drivers. Choose to automatically search
for the drivers for the E VA L -SDP-CH1Z board if prompted
by the operating system.
5. Launch the E VA L -AD7944FMCZ/E VA L -AD7985FMCZ/
E VA L-AD7986FMCZ software from the Analog Devices
subfolder in the Programs menu. The full software
installation procedure is described in the Evaluation Board
Software section.
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EVALUATION BOARD SOFTWARE
SOFTWARE INSTALLATION
The AD7944/AD7985/AD7986 evaluation software is available to
download from the EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/
EVAL-AD7986FMCZ product pages. Double-click the setup.exe
file to run the install. The default location for the software is
C:\Program Files (x86)\Analog Devices\AD7944_85_86
Evaluation Software.
Install the evaluation software before connecting the evaluation
board and EVAL-SDP-CH1Z board to the USB port of the PC
to ensure that the evaluation system is correctly recognized when
connected to the PC.
There are two parts of the software installation process:
AD7944/AD7985/AD7986 evaluation software installation
EVAL-SDP-CH1Z board driver installation
Figure 3 to Figure 9 show the separate steps to install the AD7944/
AD7985/AD7986 evaluation software, and Figure 10 to Figure 15
show the separate steps to install the EVAL-SDP-CH1Z drivers.
Proceed through all of the installation steps to install the software
and drivers in the appropriate locations.
Connect the EVAL-SDP-CH1Z board to the PC only after the
software and drivers have been installed.
12476-003
Figure 3. User Account Control
12476-004
Figure 4. Evaluation Software Installation—Initializing
12476-005
Figure 5. Evaluation Software Installation—Choose Install Location
12476-006
Figure 6. Evaluation Software Installation—License Agreement
12476-007
Figure 7. Evaluation Software Installation—Summary
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12476-008
Figure 8. Evaluation Software Installation—In Progress
12476-009
Figure 9. Evaluation Software Installation—Complete
12476-010
Figure 10. EVAL-SDP-CH1Z Drivers Setup—Welcome
12476-011
Figure 11. EVAL-SDP-CH1Z Drivers Setup—Choose Install Location
12476-012
Figure 12. EVAL-SDP-CH1Z Drivers Setup—Installing Drivers
12476-013
Figure 13. EVAL-SDP-CH1Z Drivers Setup—Windows Security
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12476-014
Figure 14. EVAL-SDP-CH1Z Drivers Setup—Installation Complete
12476-015
Figure 15. Restart Required
After installation is complete, connect the EVAL-AD7944FMCZ,
the EVAL-AD7985FMCZ, or the EVAL-AD7986FMCZ to the
EVAL-SDP-CH1Z board, as described in the Evaluation Board
Hardware section.
When you first plug in the EVAL-SDP-CH1Z board via the USB
cable provided, allow the new Found Hardware Wizard to run.
Once the drivers are installed, check that the board has connected
correctly by looking at the Device Manager of the PC. The Device
Manager can be accessed via My Computer > Manage > Device
Manager from the list of System Tools. The EVAL-SDP-CH1Z
board appears under ADI Development Tools, which indicates
that the installation is complete.
12476-016
Figure 16. Device Manager
LAUNCHING THE SOFTWARE
Once the evaluation board and the EVAL-SDP-CH1Z board are
correctly connected to your PC, the AD7944/AD7985/AD7986
evaluation software can be launched.
1. From the Start menu, click Programs > Analog Devices >
AD7944_85_86 Evaluation Software. The main window
of the software appears (see Figure 19).
a. If the evaluation system is not connected to the USB
port via the EVAL-SDP-CH1Z when the software is
launched, a connectivity error displays (see Figure 17).
b. Connect the evaluation board to the USB port of the PC.
c. Wait for a few seconds and then click Rescan (see
Figure 18).
12476-018
Figure 17. Connectivity Error Alert 1
12476-017
Figure 18. Connectivity Error Alert 2
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SOFTWARE OPERATION
This section describes the full software operation and all the
windows that appear. When the software is launched, the main
software window opens, and the software searches for hardware
connected to the PC. The user software window launches as
shown in Figure 19. The labels listed in this section correspond
to the numbered labels in Figure 19.
File Menu
The File menu, Label 1 in Figure 19, has the following options:
• Save Captured Data: saves data to a .CSV file
• Load Captured Data: loads data for analysis
• Take Screenshot: saves the current screen
• Print: prints the window to the default printer
• Exit: closes the application
Edit Menu
The Edit menu, Label 2 in Figure 19, provides the Initialize to
Default Values option, which resets the software to its initial state.
Help Menu
The Help menu, Label 3 in Figure 19, offers help from the
• Analog Devices website
• User Guide
• Context Help
• About
Eval Board Connected
This indicator, Label 4 in Figure 19, shows that the evaluation
board is connected. In Figure 19, the connected evaluation
board is the E VA L -AD7985FMCZ.
Samples
From the Samples drop-down menu, Label 5 in Figure 19,
select the number of samples to analyze when running the
software; this number is limited to 1,048,576 samples.
Single Capture and Continuous Capture
Clicking Single Capture , Label 6 in Figure 19, performs a
single capture, whereas clicking Continuous Capture, Label 7
in Figure 19, performs a continuous capture from the ADC.
Interface Selection
The Interface Selection drop-down menu, Label 8 in Figure 19,
provides options for using 3-wire or 4-wire mode, reading
during or reading after conversion, and no busy signal mode.
Voltage Reference
The options for using the external reference or internal reference
are controlled by the Voltage Reference drop-down menu,
Label 9 in Figure 19. The default value is set to 5 V (external
reference and external buffer). The other voltage reference
options are 4.096 V (external or internal reference) and 2.048 V
(external reference). When using the external reference, it is
recommended to use an on-board AD8031 as an external
reference buffer.
Turbo Mode
The Turbo Mo de button, Label 10 in Figure 19, provides the
options of Turbo On or Turbo Off (normal mode). Note that
the throughput must be manually changed when changing modes.
Throughput
The Through Output field, Label 11 in Figure 19, controls the
throughput. The default throughput (sampling frequency) is
2000 kSPS. The user can adjust the sampling frequency; however
there are limitations around the sample frequency related to the
SCLK frequency applied. The sample frequency must be at least
200 kSPS. The AD7985 is capable of operating a maximum sample
frequency of 2500 kSPS in reading during conversion turbo mode.
If the user enters a value exceeding the maximum capacity of
the device, the software indicates this, and the user must revert
to the maximum sample frequency.
Tabs
There are four additional tabs available for displaying the data
in different formats.
• Waveform
• Histogram
• FFT
• Summary
To exit the software, go to File > Exit.
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 12 of 31
12 3
5
4
67
8
9
10
11
12476-019
Figure 19. Evaluation Software Window
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 13 of 31
WAVEFORM CAPTURE
Figure 20 shows the Waveform tab. A 20 kHz sine wave input
signal was used along with an on-board 5 V external reference.
The Waveform Ana lysis boxes, Label 1 in Figure 20, show the
amplitudes recorded from the captured signal in addition to the
frequency of the signal tone.
1
CONTROL
CURSOR CONTROL
PANNING
CONTROL
ZOOMING
12476-020
Figure 20. Waveform Capture Tab
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 14 of 31
DC TESTING—HISTOGRAM
Figure 21 shows the Histogram tab. The histogram can be used
to test the ADC for the code distribution for dc input, compute
the mean and standard deviation or transition noise of the
converter, and display the results. Raw data is captured and
passed to the PC for statistical computations.
To perform a histogram test, click the Histogram tab, then click
Single Capture or Continuous Capture.
A histogram test can be performed without an external source
because the evaluation board has a buffered VREF/2 source at the
ADC input.
To test other dc values, apply a source to the J1 and J2 inputs.
The signal may need to be filtered so that the dc source noise is
compatible with that of the ADC.
AC TESTING—HISTOGRAM
The histogram can also be used to test the ADC for the code
distribution for ac input, compute the mean and standard deviation
or transition noise of the converter, and display the results. Raw
data is captured and passed to the PC for statistical computations.
To perform a histogram test, click the Histogram tab, then click
Single Capture or Continuous Capture.
An ac histogram requires a quality signal source applied to the
input J1/J2 connectors.
Figure 21 shows the histogram for a 20 kHz sine wave applied to
the ADC input and the results calculated.
The Histogram Analysis boxes, Label 1 in Figure 21, show the
various measured values for the data captured.
1
12476-021
Figure 21. Histogram Capture Tab
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 15 of 31
AC TESTING—FFT CAPTURE
Figure 22 shows the FFT tab. This tests the traditional ac
characteristics of the converter and displays a fast Fourier
transform (FFT) of the results. As in the histogram test, raw
data is captured and passed to the PC where the FFT is performed
to display the signal-to-noise ratio (SNR), signal-to-noise-and-
distortion ratio (SINAD), total harmonic distortion (THD),
and spurious-free dynamic range (SFDR).
To perform an ac test, apply a sinusoidal signal to the evaluation
board at the SMA inputs, J1 and J2. A very low distortion, better
than 130 dB input signal source (such as audio precision) is
required to allow true evaluation of the device. One possibility
is to filter the input signal from the ac source. There is no
suggested band-pass filter, but carefully consider the choices.
Furthermore, if using a low frequency band-pass filter when the
full-scale input range is more than a few volts peak-to-peak, it is
recommended to use the on-board amplifiers to amplify the signal,
thus preventing the filter from distorting the input signal.
Figure 22 displays the results of the captured data.
FFT Analysis shows the input signal information (Label 1), as
well as the performance data, including SNR, dynamic range, THD,
SINAD, and noise performance (Label 3).
Show Harmonic Content displays the fundamental frequency and
amplitude in addition to the second to fifth harmonics (Label 2).
1 3
2
12476-022
Figure 22. FFT Capture Tab
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 16 of 31
SUMMARY TAB
Figure 23 shows the Summary tab, which captures all the display information and provides it in one tab with a synopsis of the information,
including key performance parameters such as SNR and THD.
12476-023
Figure 23. Summary Tab
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 17 of 31
TROUBLESHOOTING
This section provides recommendations on how to prevent and
troubleshoot problems encountered with the software and the
hardware.
SOFTWARE
Follow these recommendations for the evaluation software:
• Always install the software prior to connecting the
hardware to the PC.
• Always allow the install to fully complete (the software
installation is a two part process: installing the ADC software
and the SDP drivers). This may require a restart of the PC.
• When you first plug in the E VA L -SDP-CH1Z board via the
USB cable provided, allow the new Found Hardware Wizard
to run. Though this may take time, do this prior to starting
the software.
• If the board does not appear to be functioning, ensure that the
ADC evaluation board is connected to the E VA L -SDP-CH1Z
board and that the SDP board is recognized in the Device
Manager, as shown in Figure 16.
• If connected to a slower USB port where the E VA L -SDP-
CH1Z cannot read quickly, a timeout error may occur. In
this case, it is advised not to read continuously or, alternatively,
to lower the number of samples taken.
• Note that when reading continuously from the ADC, the
recommended number of samples is up to 1,048,576.
HARDWARE
If the software does not read any data back, take the following steps:
• With the 12 V wall wart plugged in to the E VA L -SDP-CH1Z
board, check that the voltage applied is within the ranges
shown in Table 3.
• Using a digital multimeter (DMM), measure the voltage
present at 12 V and the VADJ test points, which should
read 12 V and 2.5 V, respectively. The +12V_FMC LED of
the evaluation board and the LEDs of the E VA L-SDP-CH1Z
board (FMC_PWR_GO, SYS_PWR, FPGA_DONE,
BF_POWER, LED0, and LED2) should all be lit.
• Launch the software and read the data. If nothing happens,
exit the software.
• Remove the 12 V wall wart and USB from the E VA L -SDP-
CH1Z board, and then reconnect them and relaunch the
software.
• If an error occurs, check that the evaluation board and the
E VA L-SDP-CH1Z board are connected together so that the
E VA L-SDP-CH1Z is recognized in the Device Manager, as
shown in Figure 16.
Note that when working with the software in standalone/offline
mode (no hardware connected), if you later choose to connect
hardware, first close and then relaunch the software.
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 18 of 31
EVALUATION BOARD SCHEMATICS AND ARTWORK
12476-024
VIN = + 5V , VOUT= –3V , IOUT = UP TO 200mA
VIN = + 12V , VOUT= + 5V , IOUT = UP TO 200mA VIN = + 12V , VOUT= + 7.5V, IO UT = UP TO 200mA
SYSTEM POW ER SUPPLY OPT I O NS
R6
23.7K
1 2
L2
22 µH
LPS4414-223MLB
R11
64.9K
–3P0V
C69
4.7µF
C70
4.7µF
R18
5K
R19
10K
+7.5V
R7
0r
+5V
C34
4.7µF
C36
4.7µF
R63
0r
A
B
LK1 +12V
R5
3k3
+12V_SYS
GREEN
C13
10µF
+12V_EXT
GND1
L6
1.0 µH
LQH32CN1R0M33LC66
4.7µF
R61
1R
D1
40V,200mA
1PS79SB30
C4
4.7µF
C6
1µF
C19
1µF
C29
DNP C37
DNP
R62
0r
1
VOUT
2
SENSE/ADJ
3
GND
4EN5
SS
6VIN
7EP(GND)
U10
ADP7118ACPZN-5.0
1
VOUT
2
SENSE/ADJ
3
GND
4EN 5
SS
6VIN
7EP(GND)
U18
ADP7118ACPZN-5.0
1VIN
2FSEL
3EN
4SYNC 5
FB
6
PG
7
SW
8
PGND
9
PADDLE
U2
ADP2370ACPZ-5.0
+5V
+12V+7.5V+5V
+12V
PG_C2MPG_C2M
–3.0V
+12V_FMC
+12V
Figure 24. Schematic—System Power Supply Options
12476-025
SCREW
TERMINALS
OPAMP POWER SUPPLY OPT I O NS ADC POWER SUPPLY OPTIONS
C63
4.7 µF
C64
4.7µF
1
2
3
JP8
1
2
3
JP9
B
A
LK4
B
A
LK5
R4
0r
R20
0r
J3-1
J3-2
J3-3
1
2
3
JP6
1
2
3
JP10
1
2
3
JP11 1
2
3
JP12
1 2
L3
12
L1
600Z
HZ0805E601R
L0805
1 2
L41 2
L5
2V5_EXT
BVDD_EXT
C14
4.7µF
C30
4.7 µF
C33
10 µF C32
10 µF C39
10 µF C65
10 µF
C18
10 µF
C16
10µF
1IN
2GND
3EN4
NC
5
OUT
U3
ADM7160AUJZ-2.5
1IN
2GND
3EN 4
NC
5
OUT
U12
ADM7160AUJZ-2.5
+5V
AMP_PWR+_EXT
+7.5V
+5V
–3.0V
AMP_PWR–
AMP_PWR+
BVDD
AVDD DVDD VIO
+5V
Figure 25. Schematic—Op Amp and ADC Power Supply Options
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 19 of 31
12476-026
2–
3+6
OP
4
V–
7
V+
U4
AD8031ARZ
C20
0.1µF C21
2.2µF C22
TBD DNP
C23
2.2µF C24
TBD DNP
R21
0r
R24
0r
C26
TBD DNP
R25
TBD DNP
C27
0.1µF
2–
3+6
OP
4
V–
7
V+
U11
AD8031ARZ
C40
0.1µF
C43
0.1µF
R16
0r
R39
0r
1
2
3
JP5
VCM_EXTERNAL
R14
0r
5V_REF
2PT5V_REF
R15
0r
VCM
A
B
LK7
GND2
R45
DNP
2+VIN 6
VOUT
4
GND
U5
ADR4550BRZ
2+VIN 6
VOUT
4
GND
U8
ADR4525BRZ
C35
0.1µF
R3
0r
C61
0.1µF
1
GND_F
2
GND_S
3EN
4VIN
5
VOUT_S
6
VOUT_F
U13
ADR3412ARJZ
R8
0r
1PT2V_REFIN
R30
TBD DNP
A
B
LK2
2–
3+6
OP
4
V–
7
V+
U19
AD8031ARZ
R34
100r
R67
0r
C17
TBD DNP
C75
0.1uF
C38
10µF
R12
1K
C11
10µF
R22
1K C25
10µF
C44
10µF
C42
10µF
R17
0r
C60
10µF
C62
10µF
C15
10µF
A
B
LK6
AMP_PWR+
AMP_PWR+
+7.5V
REF REF
VCM
REFIN
+5V
AMP_PWR+
Figure 26. Schematic—External Reference
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 20 of 31
12476-027
AIN+
AIN-
OPTIO NA L HE A DE R CONNECT OR
C73 AND C74 ARE COMPENSATION CAPACITORS,
GUARD RING AROUND S EE AD8 0 2 1 F IGURE 62
1
FB
2–
3+
4
V– 5
V– 6
VOUT
7
V+
8
D
U15
ADA4899-1
1
FB
2–
3+
4
V– 5
V– 6
VOUT
7
V+
8
D
U16
ADA4899-1
1
2
3
JP1
1
2
3
JP2
1
2
3
JP3
1
2
3
JP4
R52
10r
C49
1.5nF
R59
0r
R48
0r
C52
0.1µF
C53
DNP
C54
0.1µF
C55
DNP
C56
C57
C58
C59
R10
0r
R27
0r
R28
0r
R29
0r R60
0r
R35
0r
C76
100pF
GND3
J1
J2
J4
J5
J6-1
tba
J6-2
J6-3
J6-4
J6-5
J6-6
J8-1
J8-2
J8-3
J8-4
J8-5
J8-6
J8-7
J9-1
J9-2
J9-3
J9-4
J9-5
J9-6
J9-7
R51
200r
R50
0r
R43
0r
C41
0.1µF
R44
DNP R47
DNP
C45
DNP
R49
DNP C46
DNP
8+IN
2VOCM
1–IN
5
–OUT
4
+OUT
6
V–
3
V+
U14
AD8139ARDZ
R55
DNP C51
DNP
C67
DNP
C68
DNP
C72
0.1µF
C73 DNP
C74 DNP
C47
DNP
R13
590R26
590
R23
0r
R36
0r
R46
0r
R37
590
R40
590
R41
590
R38 590
C71
100pF
R53
10rC48
1.5nF
R42
200r
R54
200rR56
200r
R57
820r
R58
820r
C50
0.1µF
DIFF_IN+
DIFF_IN-
AMP_PWR–
AMP_PWR+
AMP_PWR–
AMP_PWR+
OP_AMP-
OP_AMP+
OP_AMP+
OP_AMP–
VCM
VCM IN+
IN–
VCM
AMP_PWR+
AMP_PWR-
VIN–
VIN+
VOUT–
VOUT+
VCM
AMP_PWR–
AMP_PWR+
DIFF_IN+
DIFF_IN– AMP_PWR+
AMP_PWR–
VIN+
VIN–
VOUT+
VOUT–
VCM
Figure 27. Schematic—Analog Front End
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 21 of 31
Figure 28. Schematic—AD7944/AD7985/AD7986 Decoupling
AF22
AG23
AF20
AF21
AH21
AJ21
AG25
AH25
AE25
AF25
AC24
AD24
AK26
AJ26
AG27
AG28
AG30
AH30
AE30
AF30
AB29
AB30
Y30
AA30
AD23
AE24
AG20
AH20
AJ22
AJ23
AA20
AB20
AC22
AD22
AF26
AF27
AJ27
AK28
AC26
AD26
AE28
AF28
AD29
AE29
AC29
AC30
AE23
AF23
AG22
AH22
AK23
AK24
AB24
AC25
AB27
AC27
AH26
AH27
AK29
AK30
AK20
AK21
AJ24
AK25
AD21
AE21
AD27
AD28
AJ28
AJ29
FPGA I2CLines SCL
SDA
BOARD PRESENT PINDP0_C2M_P
DP0_C2M_N
DP0_M2C_P
DP0_M2C_N
LA06_P
LA06_N
LA10_P
LA10_N
LA14_P
LA14_N
LA18_P_CC
LA18_N_CC
LA27_P
LA27_N
GA0
12P0V
12P0V
3P3V
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
PG_C2M
GBTCLK0_M2C_P
GBTCLK0_M2C_N
LA01_P_CC
LA01_N_CC
LA05_P
LA05_N
LA09_P
LA09_N
LA13_P
LA13_N
LA17_P_CC
LA17_N_CC
LA23_P
LA23_N
LA26_P
LA26_N
TCK
TDI
TDO
3P3VAUX
TMS
TRST_L
GA1
3P3V
3P3V
3P3V
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VADJ
CLK1_M2C_P
CLK1_M2C_N
LA00_P_CC
LA00_N_CC
LA03_P
LA03_N
LA08_P
LA08_N
LA12_P
LA12_N
LA16_P
LA16_N
LA20_P
LA20_N
LA22_P
LA22_N
LA25_P
LA25_N
LA29_P
LA29_N
LA31_P
LA31_N
LA33_P
LA33_N
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VADJ
VREF_A_M2C
PRSNT_M2C_L
CLK0_M2C_P
CLK0_M2C_N
LA02_P
LA02_N
LA04_P
LA04_N
LA07_P
LA07_N
LA11_P
LA11_N
LA15_P
LA15_N
LA19_P
LA19_N
LA21_P
LA21_N
LA24_P
LA24_N
LA28_P
LA28_N
LA30_P
LA30_N
LA32_P
LA32_N
EEPROMrequiredinVITA standard
I2Clinepull-up resistors onFPGA board
default SDO connect SDO_FMC
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
C25
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35
C36
C37
C38
C39
C40
J7-A
ASP-134604-01 D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
D32
D33
D34
D35
D36
D37
D38
D39
D40
J7-B
ASP-134604-01 G1
G2
G3
G4
G5
G6
G7
G8
G9
G10
G11
G12
G13
G14
G15
G16
G17
G18
G19
G20
G21
G22
G23
G24
G25
G26
G27
G28
G29
G30
G31
G32
G33
G34
G35
G36
G37
G38
G39
G40
J7-C
ASP-134604-01 H1
H2
H3
H4
H5
H6
H7
H8
H9
H10
H11
H12
H13
H14
H15
H16
H17
H18
H19
H20
H21
H22
H23
H24
H25
H26
H27
H28
H29
H30
H31
H32
H33
H34
H35
H36
H37
H38
H39
H40
J7-D
ASP-134604-01
R1
1E0
2E1
3E2
4
VSS
5
SDA
6SCL
7WP
8
VCC
U7
M24C02-WMN6TP
VADJ
R2
DNP R9
DNP
C7
0.1µF 3P3VAUX
PG_C2M
B
A
B
A
B
A
B
A
B
A
LK11
LK13
LK9
LK12
R31
0r
R32
0r
R64
0r
R33
0r
R65 0r
J10-2
J10-3
J10-4
J10-5
J10-6
2
4U17
NC7S04
1
VCCA
2
T/R0 3
A0 4
A1 5
A2 6
A37
T/R3
8
GND
9
OE
10 T/R2
11 B3
12 B2
13B1
14 B0
15 T/R1
16
VCCB
17
EP
U9
FXL4TD245BQX
R66
10k
1
VCCA
2A0
3A1
4T/R0
5
GND
6
T/R1
7
OE
8
B1
9
B0
10
VCCB
U6
FXL2TD245
C31
0.1µF
C28
0.1µF
LK8
J10-1
3P3VAUX
GA1
GA0
+12V_FMC
GA0
PG_C2M
3P3VAUX
GA1
VADJ VADJ
SCK_FMC
3P3VAUX
I2C_SDA
I2C_SCL
CNV_FMC
SDO_FMC
TURBO_FMC
SDI_FMC
SDI_FMC
SCK_FMC
CNV_FMC
TURBO_FMC
SDO_FMC
TURBO_T
CNV_T
SCK_T
SDI_T
SDO_T
TURBO_FMC
CNV_FMC
SCK_FMC
SDI_FMC
TURBO
CNV
SCK
SDI
SDO
VIO
PG_C2M
VADJ VIO VADJ
SCK_T
SCK_FMC
SDO SDO_T
SDI_FMC SDI_T
CNV_T
TURBO_T
CNV_FMC
TURBO_FMC
12476-029
Figure 29. Schematic—FMC-LPC Male Connector
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 22 of 31
12476-030
Figure 30. Evaluation Board Silkscreen—Top Assembly
xxxxx-xxx
Figure 31. Evaluation Board Silkscreen—Bottom Assembly
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 23 of 31
12476-032
Figure 32. Evaluation Board—Top Layer
12476-033
Figure 33. Evaluation Board Layer 2—Ground
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
Rev. 0 | Page 24 of 31
12476-034
Figure 34. Evaluation Board Layer 3—Power
12476-035
Figure 35. Evaluation Board Bottom Layer
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 25 of 31
BILL OF MATERIALS
Table 4. Analog Bill of Materials for EVAL-AD7986FMCZ
Reference Designator Part Description Part Number Stock Code
+5V, +7V5, +12V, +12V_EXT,
−3P0V, 1PT2V_REFIN,
2PT5V_REF, 2V5_EXT,
3P3VAUX, 5V_REF,
BVDD_EXT, GND1 to GND3
Test point 20-313137 Not Inserted
PG_C2M, VADJ, VCM,
VCM_EXTERNAL
Test point 20-313137 Do Not Place
+12V_SYS LED, 0603, green SML-LX0603SUGW-TR Digikey 67-1693-1-ND
C1, C8, C11, C15, C25, C32,
C33, C38, C39, C42, C44,
C60, C62, C65
Capacitor 0805ZC106KAT2A FEC 2094042
C2, C3, C5, C7, C9, C12,
C20, C27, C28, C31, C35,
C40, C43, C52, C54, C56 to
C59, C61, C75
Capacitor, 0603 MCCA000255 FEC 1759122
C4, C66, C77, C78 Capacitor GRM188R60J475KE19D FEC 1735527
C6, C19 Capacitor GRM188R61A105KA61D FEC 1828798
C10, C17, C22, C24, C26 Capacitor TBA Do Not Place
C13, C16, C18
Capacitor
GRM219R61C106KA73D
FEC 1845747
C14, C30, C34, C36, C63,
C64, C69, C70
Capacitor EMK212B7475KG-T FEC 2112841
C21, C23 Capacitor EMK212B7225KG-T FEC 1683654
C29, C37, C41, C45 to C47,
C50, C51, C53, C55, C67,
C68, C72 to C74, C79
Capacitor, 0603 Not Applicable Do Not Place
C48, C49 Capacitor, 0603 MCCA000201 FEC 1907308
C71, C76 Capacitor, 0603 C1608C0G1H101J080AA FEC 1907297
D1 Diode, Schottky, 40 V, 0.2 A, 1PS79SB30 1PS79SB30 FEC 8734097
J1, J2 SMA 5-1814400-1 Not Inserted
J3 Connector, Power 3 CTB5000/3 FEC 151790
J4, J5 SMA 142-0701-851 Digikey J658-ND
J6 Header, 06, SKT, RA TBA Not Inserted
J7 ASP-134604-01 ASP-134604-01 Samtec ASP-134604-01
J8 Connector, 7 position, header SSW-107-01-T-S FEC 1803478
J9 Connector, 7 position, header TLW-107-05-G-S FEC 1668499
J10
Connector, 6 position, header
TLW-106-05-G-S
Not Inserted
JP1 to JP12, LK6 to LK9, LK11
to LK14, R1, R3, R4, R10
3 W, solder link, 0603 MC 0.063W 0603 0R FEC 9331662
L1, L3 to L5 Bead, 0805 HZ0805E601R DigiKey 240-1018-1-ND
L2 Inductor, 22 µH, LPS4414-223MLB LPS4414-223MLB FEC 2287727
L6 Inductor LQH32CN1R0M33L FEC 9522174
LK1, LK2, LK4, LK5, LK10 Jumper, 2 M20-9983646 & M7566-05 FEC 1022244 & 150-411 (36 Pin Strip)
LK3 Jumper M20-9990246 Do Not Insert
R2, R9, R13, R26, R44, R47,
R49, R55, R70, R72
Resistor Not Applicable Do Not Place
R5 Resistor MC0063W060313K3 FEC 9331026
R6
Resistor
MC0063W0603123K7
FEC 1170924
R7, R8, R14, R16, R17, R39,
R45, R63
Resistor MC 0.1W 0805 0R FEC 9333681
R11 Resistor MC0063W0603164K9 FEC 1170968
R12, R22 Resistor MC 0.063W 0603 1% 1K FEC 9330380
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Rev. 0 | Page 26 of 31
Reference Designator Part Description Part Number Stock Code
R15, R20, R21, R23, R24, R27
to R29, R31 to R33, R35, R36,
R43, R46, R48, R50, R59, R60,
R64, R65, R67
Resistor, 0 Ω MC 0.063W 0603 0R FEC 9331662
R18
Resistor
CRCW08055K00FKTA
FEC 1835558
R19 Resistor MCTC0525B1002T5E FEC 1575900
R25, R30 Resistor TBA Do Not Place
R34 Resistor MC01W08051100R FEC 9332375
R37, R38, R40, R41 Resistor ERA6AEB5900V FEC 1810481
R42, R51, R54, R56 Resistor ERA3AEB201V Do Not Place
R52, R53 Resistor CPF0805B10RE1 FEC 1697403
R57, R58 82 Ω, 0603, 1%, 0.063 W MC0063W0603182R FEC 9331590
R61 Resistor MC0063W060311R0 FEC 2141505
R62 18 Ω, 0805, 1%, 0.1 W MC01W0805118R FEC 9332740
R66 Resistor MC0063W0603110K FEC 9330399
R68 Resistor CRCW04020000Z0ED FEC 1469661
R69 Resistor MC00625W0402111K FEC 1358070
R71 Resistor MC00625W0402111K5 FEC 1803142
U1 AD7986BCPZ AD7986BCPZ AD7986BCPZ
U2 ADP2370ACPZ ADP2370ACPZ ADP2370ACPZ-R7
U3, U12
ADM7160AUJZ-2.5
ADM7160AUJZ-2.5
ADM7160AUJZ-2.5-R2
U4, U11, U19
AD8031ARZ
AD8031ARZ
AD8031ARZ
U5 ADR4550BRZ ADR4550BRZ ADR4550BRZ
U6 FXL2TD245 FXL2TD245L10X Digikey FXL2TD245L10XCT-ND
U7 M24C02-WMN6TP M24C02-WMN6TP Digikey 497-8552-1-ND
U8 ADR4525BRZ ADR4525BRZ ADR4525BRZ
U9 FXL4TD245BQX FXL4TD245BQX Digikey FXL4TD245BQXCT-ND
U10, U18 ADP7118ACPZN-5.0 ADP7118ACPZN-5.0 ADP7118ACPZN-5.0-R7
U13 ADR3412ARJZ ADR3412ARJZ ADR3412ARJZ-R2
U14 AD8139ARDZ AD8139ARDZ Do Not Place
U15, U16 ADA4899-1 ADA4899-1YRDZ ADA4899-1YRDZ
U17 NC7S04 NC7SZ04M5 FEC 1013809
U20
ADP7182AUJZ
ADP7182AUJZ
ADP7182AUJZ-R7
X1, X2 MTHOLE-4MM TBA Do Not Place
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 27 of 31
Table 5. Analog Bill of Materials for EVAL-AD7985FMCZ
Reference Designator Part Description Part Number Stock Code
+5V, +7V5, +12V, +12V_EXT,
−3P0V, 1PT2V_REFIN,
2PT5V_REF, 2V5_EXT,
3P3VAUX, 5V_REF,
BVDD_EXT, GND1 to GND3
Test point 20-313137 Not Inserted
PG_C2M, VADJ, VCM,
VCM_EXTERNAL
Test point 20-313137 Do Not Place
+12V_SYS LED, 0603, green SML-LX0603SUGW-TR Digikey 67-1693-1-ND
C1, C8, C11, C15, C25, C32,
C33, C38, C39, C42, C44,
C60, C62, C65
Capacitor 0805ZC106KAT2A FEC 2094042
C2, C3, C5, C7, C9, C10, C12,
C20, C27, C28, C31, C35,
C40, C43, C52, C54, C56 to
C59, C61, C75
Capacitor, 0603 MCCA000255 FEC 1759122
C4, C66, C77, C78 Capacitor GRM188R60J475KE19D FEC 1735527
C6, C19 Capacitor GRM188R61A105KA61D FEC 1828798
C17, C22, C24, C26 Capacitor TBA Do Not Place
C13, C16, C18 Capacitor GRM219R61C106KA73D FEC 1845747
C14, C30, C34, C36, C63,
C64, C69, C70
Capacitor EMK212B7475KG-T FEC 2112841
C21, C23 Capacitor EMK212B7225KG-T FEC 1683654
C29, C37, C41, C45 to C47,
C50, C51, C53, C55, C67,
C68, C72 to C74, C79
Capacitor, 0603 Not Applicable Do Not Place
C48, C49 Capacitor, 0603 MCCA000201 FEC 1907308
C71, C76
Capacitor, 0603
C1608C0G1H101J080AA
FEC 1907297
D1 Diode, Schottky, 40 V, 0.2 A, 1PS79SB30 1PS79SB30 FEC 8734097
J1, J2 SMA 5-1814400-1 Not Inserted
J3 Connector, Power 3 CTB5000/3 FEC 151790
J4, J5 SMA 142-0701-851 Digikey J658-ND
J6
Header, 06, SKT, RA
TBA
Not Inserted
J7 ASP-134604-01 ASP-134604-01 Samtec ASP-134604-01
J8 Connector, 7 position, header SSW-107-01-T-S FEC 1803478
J9 Connector, 7 position, header TLW-107-05-G-S FEC 1668499
J10 Connector, 6 position, header TLW-106-05-G-S Not Inserted
JP1 to JP12, LK6 to LK9, LK11
to LK14, R1, R3, R4, R10
3 W, solder link, 0603 MC 0.063W 0603 0R FEC 9331662
L1, L3 to L5 Bead, 0805 HZ0805E601R DigiKey 240-1018-1-ND
L2 Inductor, 22 µH, LPS4414-223MLB LPS4414-223MLB FEC 2287727
L6 Inductor LQH32CN1R0M33L FEC 9522174
LK1, LK2, LK4, LK5, LK10 Jumper, 2 M20-9983646 & M7566-05 FEC 1022244 & 150-411 (36 Pin Strip)
LK3 Jumper M20-9990246 Do Not Insert
R2, R9, R13, R26, R42 to
R44, R47, R49 to R51, R54,
R55, R56, R70, R72
Resistor Not Applicable Do Not Place
R5 Resistor MC0063W060313K3 FEC 9331026
R6 Resistor MC0063W0603123K7 FEC 1170924
R7, R8, R14, R16, R17, R39,
R45, R63
Resistor
MC 0.1W 0805 0R
FEC 9333681
R11 Resistor MC0063W0603164K9 FEC 1170968
R12, R22 Resistor MC 0.063W 0603 1% 1K FEC 9330380
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Reference Designator Part Description Part Number Stock Code
R15, R20, R21, R23, R24,
R27 to R29, R31 to R33,
R35, R36, R46, R48, R59,
R60, R64, R65, R67
Resistor, 0 Ω MC 0.063W 0603 0R FEC 9331662
R18
Resistor
CRCW08055K00FKTA
FEC 1835558
R19 Resistor MCTC0525B1002T5E FEC 1575900
R25, R30 Resistor TBA Do Not Place
R34 Resistor MC01W08051100R FEC 9332375
R37, R38, R40, R41 Resistor ERA6AEB5900V FEC 1810481
R52, R53 Resistor CPF0805B10RE1 FEC 1697403
R57, R58 82 Ω, 0603, 1%, 0.063 W MC0063W0603182R FEC 9331590
R61 Resistor MC0063W060311R0 FEC 2141505
R62 18 Ω, 0805, 1%, 0.1 W MC01W0805118R FEC 9332740
R66 Resistor MC0063W0603110K FEC 9330399
R68 Resistor CRCW04020000Z0ED FEC 1469661
R69 Resistor MC00625W0402111K FEC 1358070
R71 Resistor MC00625W0402111K5 FEC 1803142
U1 AD7985BCPZ AD7985BCPZ AD7985BCPZ
U2 ADP2370ACPZ ADP2370ACPZ ADP2370ACPZ-R7
U3, U12 ADM7160AUJZ-2.5 ADM7160AUJZ-2.5 ADM7160AUJZ-2.5-R2
U4, U11, U19
AD8031ARZ
AD8031ARZ
AD8031ARZ
U5
ADR4550BRZ
ADR4550BRZ
ADR4550BRZ
U6 FXL2TD245 FXL2TD245L10X Digikey FXL2TD245L10XCT-ND
U7 M24C02-WMN6TP M24C02-WMN6TP Digikey 497-8552-1-ND
U8 ADR4525BRZ ADR4525BRZ ADR4525BRZ
U9 FXL4TD245BQX FXL4TD245BQX Digikey FXL4TD245BQXCT-ND
U10, U18 ADP7118ACPZN-5.0 ADP7118ACPZN-5.0 ADP7118ACPZN-5.0-R7
U13 ADR3412ARJZ ADR3412ARJZ ADR3412ARJZ-R2
U14 AD8139ARDZ AD8139ARDZ Do Not Place
U15, U16 ADA4899-1 ADA4899-1YRDZ ADA4899-1YRDZ
U17 NC7S04 NC7SZ04M5 FEC 1013809
U20 ADP7182AUJZ ADP7182AUJZ ADP7182AUJZ-R7
X1, X2
MTHOLE-4MM
TBA
Do Not Place
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 29 of 31
Table 6. Analog Bill of Materials for EVAL-AD7944FMCZ
Reference Designator Part Description Part Number Stock Code
+5V, +7V5, +12V, +12V_EXT,
−3P0V, 1PT2V_REFIN,
2PT5V_REF, 2V5_EXT,
3P3VAUX, 5V_REF,
BVDD_EXT, GND1 to GND3
Test point 20-313137 Not Inserted
PG_C2M, VADJ, VCM,
VCM_EXTERNAL
Test point 20-313137 Do Not Place
+12V_SYS LED, 0603, green SML-LX0603SUGW-TR Digikey 67-1693-1-ND
C1, C8, C11, C15, C25, C32,
C33, C38, C39, C42, C44,
C60, C62, C65
Capacitor 0805ZC106KAT2A FEC 2094042
C2, C3, C5, C7, C9, C10,
C12, C20, C27, C28, C31,
C35, C40, C43, C52, C54,
C56 to C59, C61, C75
Capacitor, 0603 MCCA000255 FEC 1759122
C4, C66, C77, C78 Capacitor GRM188R60J475KE19D FEC 1735527
C6, C19 Capacitor GRM188R61A105KA61D FEC 1828798
C17, C22, C24, C26 Capacitor TBA Do Not Place
C13, C16, C18 Capacitor GRM219R61C106KA73D FEC 1845747
C14, C30, C34, C36, C63,
C64, C69, C70
Capacitor EMK212B7475KG-T FEC 2112841
C21, C23 Capacitor EMK212B7225KG-T FEC 1683654
C29, C37, C41, C45 to C47,
C50, C51, C53, C55, C67,
C68, C72 to C74, C79
Capacitor, 0603 Not Applicable Do Not Place
C48, C49 Capacitor, 0603 MCCA000201 FEC 1907308
C71, C76
Capacitor, 0603
C1608C0G1H101J080AA
FEC 1907297
D1 Diode, Schottky, 40 V, 0.2 A, 1PS79SB30 1PS79SB30 FEC 8734097
J1, J2 SMA 5-1814400-1 Not Inserted
J3 Connector, Power 3 CTB5000/3 FEC 151790
J4, J5 SMA 142-0701-851 Digikey J658-ND
J6
Header, 06, SKT, RA
TBA
Not Inserted
J7 ASP-134604-01 ASP-134604-01 Samtec ASP-134604-01
J8 Connector, 7 position, header SSW-107-01-T-S FEC 1803478
J9 Connector, 7 position, header TLW-107-05-G-S FEC 1668499
J10 Connector, 6 position, header TLW-106-05-G-S Not Inserted
JP1 to JP12, LK6 to LK9, LK11
to LK14, R1, R3, R4, R10
3 W, solder link, 0603 MC 0.063W 0603 0R FEC 9331662
L1, L3 to L5 Bead, 0805 HZ0805E601R DigiKey 240-1018-1-ND
L2 Inductor, 22 µH, LPS4414-223MLB LPS4414-223MLB FEC 2287727
L6 Inductor LQH32CN1R0M33L FEC 9522174
LK1, LK2, LK4, LK5, LK10 Jumper, 2 M20-9983646 & M7566-05 FEC 1022244 & 150-411 (36 Pin Strip)
LK3 Jumper M20-9990246 Do Not Insert
R2, R9, R13, R26, R42 to
R44, R47, R49 to R51, R54,
R55, R56, R70, R72
Resistor Not Applicable Do Not Place
R5 Resistor MC0063W060313K3 FEC 9331026
R6 Resistor MC0063W0603123K7 FEC 1170924
R7, R8, R14, R16, R17, R39,
R45, R63
Resistor
MC 0.1W 0805 0R
FEC 9333681
R11 Resistor MC0063W0603164K9 FEC 1170968
R12, R22 Resistor MC 0.063W 0603 1% 1K FEC 9330380
UG-727 EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide
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Reference Designator Part Description Part Number Stock Code
R15, R20, R21, R23, R24,
R27 to R29, R31 to R33,
R35, R36, R46, R48, R59,
R60, R64, R65, R67
Resistor, 0 Ω MC 0.063W 0603 0R FEC 9331662
R18
Resistor
CRCW08055K00FKTA
FEC 1835558
R19 Resistor MCTC0525B1002T5E FEC 1575900
R25, R30 Resistor TBA Do Not Place
R34 Resistor MC01W08051100R FEC 9332375
R37, R38, R40, R41 Resistor ERA6AEB5900V FEC 1810481
R52, R53 Resistor CPF0805B10RE1 FEC 1697403
R57, R58 82 Ω, 0603, 1%, 0.063 W MC0063W0603182R FEC 9331590
R61 Resistor MC0063W060311R0 FEC 2141505
R62 18 Ω, 0805, 1%, 0.1 W MC01W0805118R FEC 9332740
R66 Resistor MC0063W0603110K FEC 9330399
R68 Resistor CRCW04020000Z0ED FEC 1469661
R69 Resistor MC00625W0402111K FEC 1358070
R71 Resistor MC00625W0402111K5 FEC 1803142
U1 AD7944BCPZ AD7944BCPZ AD7944BCPZ
U2 ADP2370ACPZ ADP2370ACPZ ADP2370ACPZ-R7
U3, U12 ADM7160AUJZ-2.5 ADM7160AUJZ-2.5 ADM7160AUJZ-2.5-R2
U4, U11, U19
AD8031ARZ
AD8031ARZ
AD8031ARZ
U5
ADR4550BRZ
ADR4550BRZ
ADR4550BRZ
U6 FXL2TD245 FXL2TD245L10X Digikey FXL2TD245L10XCT-ND
U7 M24C02-WMN6TP M24C02-WMN6TP Digikey 497-8552-1-ND
U8 ADR4525BRZ ADR4525BRZ ADR4525BRZ
U9 FXL4TD245BQX FXL4TD245BQX Digikey FXL4TD245BQXCT-ND
U10, U18 ADP7118ACPZN-5.0 ADP7118ACPZN-5.0 ADP7118ACPZN-5.0-R7
U13 ADR3412ARJZ ADR3412ARJZ ADR3412ARJZ-R2
U14 AD8139ARDZ AD8139ARDZ Do Not Place
U15, U16 ADA4899-1 ADA4899-1YRDZ ADA4899-1YRDZ
U17 NC7S04 NC7SZ04M5 FEC 1013809
U20 ADP7182AUJZ ADP7182AUJZ ADP7182AUJZ-R7
X1, X2
MTHOLE-4MM
TBA
Do Not Place
EVAL-AD7944FMCZ/EVAL-AD7985FMCZ/EVAL-AD7986FMCZ User Guide UG-727
Rev. 0 | Page 31 of 31
NOTES
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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UG12476-0-7/15(0)