SPT1018
8-BIT, HIGH SPEED D/A CONVERTER
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370
Sync, Blank, Bright, Ref - High
D0 - D3
D4 - D7
(MSBs)
4 To 15
Decode
Output
Current
Switches
Out +
Out -
Video Controls In
Video Data In
Feedthrough
Convert
Ref+
Ref-
Video Data In
4
4
4
4
2
4
Ref
Buffer
Register
Comp
FEATURES
• 275 MWPS Conversion Rate - Version A
• 165 MWPS Conversion Rate - Version B
• Compatible with TDC1018 and HDAC10180
with Improved Performance
• RS-343-A Compatible
• Complete Video Controls: Sync, Blank, Bright
and Reference White (Force High)
• 10KH, 100K ECL Compatible
• Single Power Supply
• Registered Data and Video Controls
• Differential Current Outputs
• ESD Protected Data and Control Inputs
APPLICATIONS
• High Resolution Color or Monochrome Raster
Graphics Displays
• Medical Electronics: CAT, PET, MR Imaging Displays
• CAD/CAE Workstations
• Solids Modeling
• General Purpose High-Speed D/A Conversion
• Digital Synthesizers
• Automated Test Equipment
• Digital Transmitters/Modulators
GENERAL DESCRIPTION
The SPT1018 is a monolithic 8-bit digital-to-analog converter
capable of accepting video data at a 165 or 275 MWPS rate.
Complete with video controls (Sync, Blank, Reference White
[Force High], Bright), the SPT1018 directly drives doubly-
terminated 50 or 75 ohm loads to standard composite video
levels. The standard set-up level is 7.5 IRE. The SPT1018 is
pin-compatible with the HDAC10180 and the TDC1018, with
improved performance. The SPT1018 contains data and
control input registers, video control logic, reference buffer,
and current switches.
The SPT1018 is available in a 24-lead PDIP package in the
industrial temperature range. Contact the factory for military
temperature and /883 versions.
BLOCK DIAGRAM
SPT
25/14/97
SPT1018
ABSOLUTE MAXIMUM RATING (Beyond which damage may occur)1
Supply Voltages
VEE (measured to VCC) ............................... -7.0 to 0.5 V
Input Voltages
CONV, Data, and Controls .......................... VEE to 0.5 V
(measured to VCC)
Ref+ (measured to VCC) .............................. VEE to 0.5 V
Ref- (measured to VCC)............................... VEE to 0.5 V
Temperature
Operating, ambient ................................-25 to +85 °C
junction.........................................+175 °C
Lead, Soldering (10 seconds)............................. +300 °C
Storage .....................................................-60 to +150 °C
Note: 1. Operation at any Absolute Maximum Ratings is not implied. See Electrical Specifications for proper nominal applied
conditions in typical applications.
ELECTRICAL SPECIFICATIONS
VCC =ground, VEE = -5.2 V ±0.3 V, TA =TMIN to TMAX, CC = 0 pF, ISet = 1.105 mA, unless otherwise specified.
TEST TEST
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
DC ELECTRICAL CHARACTERISTICS
Integral Linearity Error 1.0 mA<I Set<1.3 mA VI -.37 +.37 % Full Scale
-.95 +.95 LSB
Differential Linearity Error 1.0 mA<ISet<1.3 mA VI -0.2 +0.2 % Full Scale
-0.5 +0.5 LSB
Gain Error VI -6.5 +6.5 % Full Scale
Gain Error Tempco V 150 PPM/°C
Input Capacitance, REF+, REF- V 5 pF
Compliance Voltage, +Output VI -1.2 1.5 V
Compliance Voltage, -Output VI -1.2 1.5 V
Equivalent Output Resistance VI 20 kΩ
Output Capacitance V 12 pF
Maximum Current, + Output IV 45 mA
Maximum Current, - Output IV 45 mA
Output Offset Current VI 0.05 0.5 LSB
Input Voltage, Logic HIGH VI -1.0 V
Input Voltage, Logic LOW VI -1.5 V
Convert Voltage, IV -0.5 -2.5 V
Common Mode Range (VICM)
Convert Voltage, Differential (VIDF) IV 0.4 1.2 V
Input Current, Logic LOW, VI 35 120 µA
Data and Controls
Input Current, Logic HIGH, VI 40 120 µA
Data and Controls
Input Current, Convert VI 2 60 µA
SPT
35/14/97
SPT1018
ELECTRICAL SPECIFICATIONS
VCC =ground, VEE = -5.2 V ±0.3 V, TA =TMIN to TMAX, CC = 0 pF, ISet = 1.105 mA, unless otherwise specified.
TEST
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
DC ELECTRICAL CHARACTERISTICS
Input Capacitance, V 3.0 pF
Data and Controls
Power Supply Sensitivity VI -120 20 +120 µA/V
Supply Current VI 155 220 mA
DYNAMIC CHARACTERISTICS (RL = 37.5 ohms, CL = 5 pF, TA = 25 °C, ISet = 1.105 mA)
Maximum Conversion Rate B Grade IV 165 MWPS
A Grade IV 275 MWPS
Rise Time 10% to 90% G.S. IV 1.6 ns
TA = TMIN to TMAX IV 2.0 ns
Rise Time 10% to 90% G.S. V 1.0 ns
RL = 25 ohms
Current Settling Time, Clocked Mode To 0.2% G.S. V 7.0 ns
Current Settling Time, Clocked Mode To 0.8% G.S. V 5.5 ns
Current Settling Time, Clocked Mode To 0.2% G.S. V 4.5 ns
tSI RL = 25 Ω
Clock to Output Delay, Clocked Mode IV 2.2 4.0 ns
tDSC TA = TMIN to TMAX IV 4.5 ns
Data to Output Delay, IV 3.2 6.0 ns
Transparent Mode tDST TA = TMIN to TMAX IV 6.0 ns
Convert Pulse Width, ( Low or High) B Grade IV 3.0 ns
tPWL, tPWH A Grade IV 1.8 ns
Glitch Energy Area = 1/2 VT V 4 pV-s
Reference Bandwidth, -3 dB V 1.0 MHz
Set-up Time, Data and Controls IV 1.0 ns
tSTA = TMIN to TMAX IV 1.0 ns
Hold Time, Data and Controls IV 0.5 ns
tHTA = TMIN to TMAX IV 0.5 ns
Slew Rate 20% to 80% G.S. IV 390 V/µS
TA = TMIN to TMAX IV 325 V/µS
Clock Feedthrough IV -48 dB
TA = TMIN to TMAX IV -48 dB
TEST LEVEL CODES
All electrical characteristics are subject to the
following conditions: All parameters having min/
max specifications are guaranteed. The Test
Level column indicates the specific device test-
ing actually performed during production and
Quality Assurance inspection. Any blank sec-
tion in the data column indicates that the speci-
fication is not tested at the specified condition.
TEST LEVEL
I
II
III
IV
V
VI
TEST PROCEDURE
100% production tested at the specified temperature.
100% production tested at TA = +25 °C, and sample
tested at the specified temperatures.
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design
and characterization data.
Parameter is a typical value for information purposes
only.
100% production tested at TA = +25 °C. Parameter is
guaranteed over specified temperature range.
SPT
45/14/97
SPT1018
Figure 1 - Functional Diagram
APPLICATION INFORMATION
The SPT1018 is a high speed video digital-to-analog con-
verter capable of conversion rates of up to 275 MWPS. This
makes the device suitable for driving 1500 X 1800 pixel
displays at 70 to 90 Hz update rates.
The SPT1018 is separated into different conversion rate
categories as shown in table I.
The SPT1018 has 10 KH and 100K ECL logic level compat-
ible video controls and data inputs. The complementary
analog output currents produced by the devices are propor-
tional to the product of the digital control and data inputs in
conjunction with the analog reference current. The SPT1018
is segmented so that the four MSBs of the input data are
separated into a parallel thermometer code. From here,
fifteen identical current sinks are driven to fabricate sixteen
coarse output levels. The remaining four LSBs drive four
binary weighted current switches.
The MSB currents are then summed with the LSBs, which
provide a one-sixteenth of full scale contribution, to provide
the 256 distinct analog output levels.
The video control inputs drive weighted current sinks that are
added to the output current to produce composite video
output levels. These controls, Sync, Blank, Reference White
(Force High), and Bright are needed in video applications.
Another feature that similar video D/A converters do not have
is the Feedthrough Control. This pin allows registered or
unregistered operation of the video control and data inputs.
In the registered mode, the composite functions are latched
to the pixel data to prevent screen-edge distortions generally
found on unregistered video DACs.
4
Decoding
Logic
Data
Registers
Current
Sources
And
Switches
Current
Source
Biasing
Amp
+-
Out +
Out -
8
Composite
Video Controls
Feedthrough
D0 - D7
2
CONV
CONV
Ref+
VEE VCC Ref-
Table I - The SPT1018 Family and Speed Designations
PART NUMBER UPDATE COMMENTS
SPT1018A 275 MWPS Suitable for 1200 X 1500 to 1500 X 1800
displays at 60 to 90 Hz update rate.
SPT1018B 165 MWPS Suitable for 1024 X 1280 to 1200 X 1500
displays at 60 to 90 Hz update rate.
SPT
55/14/97
SPT1018
R2
750 Ω
Output
Current
Switches
4 To 15
Decode
Video
Control
Inputs
Video
Data
Inputs
Clock
4
4
)(
Ref
Buffer
V+
R1
500 Ω
ISet ISet
*
V-
1 kΩ
– 5.2 V
.01 µF
LM113/313
FT
FH
Blank
BRT
Sync
D0 (LSB)
D1
D2
D3
D4
D5
D6
D7 (MSB)
CONV
CONV
2 kΩ
Register
Video Monitor
Out+
R3
50/75 ΩR4
50/75 Ω
50/75 Ω COAX
NOTES:
Out-
Ref+
Ref-
V- = -1.2 V (typical) for LM113.
V+ = -1.2 V
R
L
= R3 / / R4
K = 15.8069
K
1
= 1.7617
K
2
= 10.0392
FB = Ferrite bead, Fair-rite P/N 217430011 or equivalent.
= ECL Terminationx
I
Set
= V+
αT(R
1
+R
2
)
V
Sync
= (K x I
Set
x R
L
) + (K
2
x I
Set
x R
L
)
All reference resistors 1/8 W 1% metal film
power supply decoupling 50 V ceramic disc.
255-Digital Input Code
V
Out
- =
255 x I Set
R
L
+[]
K
I
x I
Set
x R
L
(Bright)
K
= V
CC
= AGND
See figure 8 for detail on Ref Buffer.
VEE
VCC COMP
-5.2 V
.01 µF
10 µF
FB
1.
2.
3.
4.
6.
7.
8.
9.
5.
10.
11.
10. = DGND (digital input drivers).
Figure 2 - Typical Interface Circuit
TYPICAL INTERFACE CIRCUIT
GENERAL
A typical interface circuit using the SPT1018 in a color raster
application is shown in figure 2. The SPT1018 requires few
external components and is extremely easy to use. The very
high operating speeds of the SPT1018 require good circuit
layout, decoupling of supplies, and proper design of trans-
mission lines. The following considerations should be noted
to achieve best performance.
INPUT CONSIDERATIONS
Video input data and controls may be directly connected to
the SPT1018. Note that all ECL inputs are terminated as
closely to the device as possible to reduce ringing, crosstalk
and reflections. A convenient and commonly used microstrip
impedance is about 130 ohms, which is easily terminated
using a 330 ohm resistor to V EE and a 220 ohm resistor to
Ground. This arrangement gives a Thevenin equivalent ter-
mination of 130 ohms to -2 volts without the need for a
-2 volt supply. Standard SIP (Single Inline Package) 220/330
resistor networks are available for this purpose. It is recom-
mended that stripline or microstrip techniques be used for all
ECL interface. Printed circuit wiring of known impedance
over a solid ground plane is recommended.
OUTPUT CONSIDERATIONS
The analog outputs are designed to directly drive a dual 50 or
75 ohm load transmission system as shown. The source
impedances of the SPT1018 outputs are high impedance
current sinks. The load impedance (RL) must be 25
or 37.5 ohms to attain standard RS-343-A video levels. Any
deviation from this impedance will affect the resulting video
output levels proportionally. As with the data interface, it is
important that the analog transmission lines have matched
impedance throughout, including connectors and transitions
between printed wiring and coaxial cable. The combination of
matched source termination resistor RS and load terminator
RL minimizes reflections of both forward and reverse travel-
ing waves in the analog transmission system. The return path
for analog output current is VCC which is connected to the
source termination resistor RS.
SPT
65/14/97
SPT1018
POWER CONSIDERATIONS
The SPT1018 operates from a single -5.2 V standard supply.
Proper bypassing of the supplies will augment the SPT1018’s
inherent supply noise rejection characteristics. As shown in
figure 2, each supply pin should be bypassed as close to the
device as possible with 0.01 µF and 10 µF capacitors.
The SPT1018 has two analog (VEE) power supply pins. Both
supply pins should be properly bypassed as mentioned
previously. This device also has two analog (VCC) ground
pins. Both ground pins should be tied to the analog ground
plane. Power and ground pins must be connected in all
applications. If a +5 V power source is required, the ground
pins (VCC) become the positive supply pins while the supply
pins (VEE) become the ground pins. The relative polarities of
the other input and output voltages must be maintained.
REFERENCE CONSIDERATIONS
The SPT1018 has two reference inputs: Ref+ and Ref-. These
pins are connected to the inverting and noninverting inputs of
an internal amplifier that serves as a reference buffer amplifier.
The output of the buffer amplifier is the reference for the
current sinks. The amplifier feedback loop is connected
around one of the current sinks to achieve better accuracy.
(See figure 8.)
Since the analog output currents are proportional to the digital
input data and the reference current (ISet), the full-scale
output may be adjusted by varying the reference current. ISet
is controlled through the Ref+ input on the SPT1018. A
method and equations to set ISet is shown in figure 2. The
SPT1018 uses an external negative voltage reference. The
external reference must be stable to achieve a satisfactory
output and the Ref- pin should be driven through a resistor to
minimize offsets caused by bias current. The value for I Set
can be varied with the 500 ohm trimmer to change the full
scale output. A double 50 ohm load (25 ohm) can be driven
if ISet is increased 50% more than ISet for doubly terminated
75 ohm video applications.
COMPENSATION
The SPT1018 provides an external compensation input
(COMP) for the reference buffer amplifier. In order to use this
pin correctly, a capacitor should be connected between
COMP and VEE as shown in figure 2. Keep the lead lengths
as short as possible. If the reference is to be kept as a
constant, use a large capacitor (.01 µF). The value of the
capacitor determines the bandwidth of the amplifier. If modu-
lation of the reference is required, smaller values of capaci-
tance can be used to achieve up to a 1 MHz bandwidth.
DATA INPUTS AND VIDEO CONTROLS
The SPT1018 has standard single-ended data inputs. The
inputs are registered to produce the lowest differential data
propagation delay (skew) to minimize glitching. There are
also four video control inputs to generate composite video
outputs. These are Sync, Blank, Bright and Reference White
or Force High. Also provided is the Feedthrough control as
mentioned earlier. The controls and data inputs are all 10 KH
and 100K ECL compatible. In addition, all have internal
pulldown resistors to leave them at a logic low so the pins are
inactive when not used. This is useful if the devices are
applied as standard DACs without the need for video controls
or if less than eight bits are used.
-1.3 V
CONV
CONV
1/2 LSB
t
PWL
t
H
t
S
t
PWH
AAAAAA
AAAAAA
AAA
tSI
OUT +
OUT -
1/2 LSB
-1.3 V
t
DSC
t
DST
Data Control
Inputs
Figure 3 - Timing Diagram
SPT
75/14/97
SPT1018
Table II - Video Control Operation (Output values for set-up = 10 IRE and 75 ohm standard load)
Sync Blank Ref
White Bright Data
Input Out - (mA) Out - (V) Out - (IRE) Description
1 X X X X 28.57 -1.071 -40 Sync Level
0 1 X X X 20.83 -0.781 0 Blank Level
0 0 1 1 X 0.00 0.000 110 Enhanced High Level
0 0 1 0 X 1.95 -0.073 100 Normal High Level
0 0 0 0 000... 19.40 -0.728 7.5 Normal Low Level
0 0 0 0 111... 1.95 -0.073 100 Normal High Level
0 0 0 1 000... 17.44 -0.654 17.5 Enhanced Low Level
0 0 0 1 111... 0.00 0.000 110 Enhanced High Level
The SPT1018 is usually configured in the synchronous
mode. In this mode, the controls and data are synchronized
to prevent pixel dropout. This reduces screen-edge distor-
tions and provides the lowest output noise while maintaining
the highest conversion rate. By leaving the Feedthrough (FT)
control open (low), each rising edge of the convert (CONV)
clock latches decoded data and control values into a D-type
internal register. The registered data is then converted into
the appropriate analog output by the switched current sinks.
When FT is tied high, the control inputs and data are not
registered. The analog output asynchronously tracks the
input data and video controls. Feedthrough itself is asynchro-
nous and usually used as a DC control.
The controls and data have to be present at the input pins for
a set-up time of ts before, and a hold time of th after, the rising
edge of the clock (CONV) in order to be synchronously
registered. The set-up and hold times are not important in the
asynchronous mode. The minimum pulse widths high (tPWH)
and low (tPWL) as well as settling time become the limiting
factors. (See figure 3.)
The video controls produce the output levels needed for
horizontal blanking, frame synchronization, etc., to be com-
patible with video system standards as described in
RS-343-A. Table II shows the video control effects on the
analog output. Internal logic governs Blank, Sync, and Force
High so that they override the data inputs as needed in video
applications. Sync overrides both the data and other controls
to produce full negative video output (figure 9).
Reference White video level output is provided by Force
High, which drives the internal digital data to full scale output
or 100 IRE units. Bright gives an additional 10% of full scale
value to the output level. This function can be used in graphic
displays for highlighting menus, cursors or warning mes-
sages. Again, if the devices are used in non-video applica-
tions, the video controls can be left open.
CONVERT CLOCK
For best performance, the clock should be ECL driven,
differentially, by utilizing CONV and
CONV
(figure 4). By
driving the clock this way, clock noise and power supply/
output intermodulation will be minimized. The rising edge of
the clock synchronizes the data and control inputs to the
SPT1018. Since the actual switching threshold of CONV is
determined by CONV, the clock can be driven single-ended
by connecting a bias voltage to
CONV
. The switching thresh-
old of CONV is set by this bias voltage.
ANALOG OUTPUTS
The SPT1018 has two analog outputs that are high imped-
ance, complementary current sinks. The outputs vary in
proportion to the input data, controls and reference current
values so that the full scale output can be changed by setting
ISet as mentioned earlier.
In video applications, the outputs can drive a doubly termi-
nated 50 or 75 ohm load to standard video levels. In the
standard configuration of figure 5, the output voltage is the
product of the output current and load impedance and is
between 0 and -1.07 V. The Out- output (figure 9) will provide
a video output waveform with the Sync pulse bottom at the
-1.07 V level. The Out+ is inverted with Sync up.
SPT
85/14/97
SPT1018
Figure 4 - CONVert, CONVert Switching Levels
VIDF
VICM MAX
0.0 V
-1.3 V
CONV
CONV
VICM MIN
Figure 5A -Standard Load
OUT +
Video Monitor
Inverse
Video
OUT-
RL
75 Ω
75 Ω COAX
RS
75 Ω
RL
75 Ω
75 Ω COAX
RS
75 Ω
SPT1018
Figure 5B -Test Load
Video Out
0 to -1 Volt
OUT +
OUT -
RL
37.5Ω
CL
<5 pF
TYPICAL RGB GRAPHICS SYSTEM
In an RGB graphics system, the color displayed is determined
by the combined intensities of the red, green and blue (RGB)
D/A converter outputs. A change in gain or offset in any of the
RGB outputs will affect the apparent hue displayed on the
CRT screen.
Thus, it is very important that the outputs of the D/A convert-
ers track each other over a wide range of operating condi-
tions. Since the D/A output is proportional to the product of the
reference and digital input code, a common reference should
be used to drive all three D/As in an RGB system to minimize
RGB DAC-to-DAC mismatch and improve TC tracking.
The SPT1019 contains an internal precision bandgap refer-
ence which completely eliminates the need for an external
reference. The reference can supply up to 50 µA to an
external load, such as two other DAC reference inputs. (See
the SPT1019 data sheet).
The circuits shown in figure 6 illustrate how a single SPT1019
may be used as a master reference in a system with multiple
DACs (such as RGB). The other DACs are simply slaved from
the SPT1019’s reference output. The SPT1018s shown are
especially well-suited to be slaved to a SPT1019 for a better
TC tracking from DAC-to-DAC, since they are essentially
SPT1019s without the reference. The SPT1018 is pin-com-
patible with the TDC1018, that does not have an internal
reference. Although either the TDC1018 or the SPT1018 may
be slaved from an SPT1019, the higher performance
SPT1018 and the above mentioned DAC-to-DAC TC track-
ing is the best choice for new designs.
No external reference is required for operation of the
SPT1019, as this function is provided internally. The internal
reference is a bandgap type and is suitable for operation over
extended temperature ranges. The SPT1018 must use an
external reference.
Figure 6 - Typical RGB Graphics System
Ref-Ref+
750 Ω500 Ω750 Ω500 Ω
R G
1 kΩ
Ref-Ref+
B
1 kΩ
Ref Out
ISet
R2
750 Ω
R1
500 ΩIRef
ISet ISet
ISet
SPT1019
(Master) SPT1018
(Slave) SPT1018
(Slave)
Figure 7 - Burn-In Circuit
CONV
1 kΩ
100 Ω
6.5 Ω
-1.2 V
(Max 1.5 mA)
1 kΩ
24 Pin DIP
All Resistors Are 5% 1/4 W cc
Clock = -0.9 to -1.7 V, 100 kHz
Ref+
CONV
1 kΩ
V
CC
Clock
(Max 60 µA)
-5.9 V
(Max 200 mA)
(Max 50 mA)
Out-
Ref-
V
EE
Out+
-1.3 V
(Max 60 µA)
1 kΩ
6.5 Ω
100 Ω
(Max 50 mA)
(Max 1.5 mA)
SPT
95/14/97
SPT1018
Figure 9 - Video Output Waveform for Standard Load
Figure 10 - Equivalent Input Circuits - Data, Clock, Controls and Reference
I
Bias
V
EE
Conv
Conv
I
Bias
V
EE
V
CC
Reference
Segment
Switch
Ref-
Ref+
I
Bias
I
Bias
80 kΩ
IBias
VEE
V
Data and
Controls
256 Gray Levels
Normal Low (Black)
Sync
Video
Blank
Bright Normal High (White)
110
100
7.5
0
-40
IRE 0 mV
-73 mV
-728 mV
-781 mV
-1071 mV
ISeg
Out+
Out-
VEE
ISeg
Current
Sink #1 Current
Sink #N
Reference
Amplifier
Ref-
Ref+
+
-
Reference
Current
Comp
Figure 8 - DAC Output Circuit
SPT
10 5/14/97
SPT1018
PACKAGE OUTLINE
24-Lead PDIP
A
B
CDE
1
24
F
G
H
K
I
J
INCHES MILLIMETERS
SYMBOL MIN MAX MIN MAX
A
B
C
D
E
F
G
H
I
J
0.190
0.135
0.022
0.012
0.550
1.255
K
0.125
0.015
0.100 typ
0.055
0.008
0.150 typ
0.600
0.530
1.245
0.070
3.18
0.38
2.54 typ
1.40
0.20
3.81 typ
15.24
13.46
31.62
1.78
4.83
3.43
0.56
1.65
0.30
15.88
13.97
31.88
2.03
0.065
0.625
0.080
SPT
11 5/14/97
SPT1018
ORDERING INFORMATION
PART NUMBER DESCRIPTION TEMPERATURE RANGE PACKAGE
SPT1018AIN 8-BIT, 275 MWPS DAC -25 to +85 °C 24L PDIP
SPT1018BIN 8-BIT, 165 MWPS DAC -25 to +85 °C 24L PDIP
PIN ASSIGNMENTS PIN FUNCTIONS
Name Function
D3 Data Bit 3
D2 Data Bit 2
D1 Data Bit 1
D0 Data Bit 0 (LSB)
VEE Negative Supply
CONV Convert Clock Input
CONV Convert Clock Input Complement
FT Register Feedthrough Control
VCC Positive Supply
FH Data Force High Control
Blank Video Blank Input
BRT Video Bright Input
Sync Video Sync Input
Ref- Reference Current - Input
Ref+ Reference Current + Input
COMP Compensation Input
Out- Output Current Negative
Out+ Output Current Positive
D7 Data Bit 7 (MSB)
D6 Data Bit 6
D5 Data Bit 5
D4 Data Bit 4
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
D4
D5
D6
D7
V
Out +
Out -
V
CC
Ref-
Sync
EE
D3
D2
D1
D0
V
EE
CONV
FT
V
CC
FH
Blank
BRT
CONV
Comp
Ref+
PDIP
Signal Processing Technologies, Inc. reserves the right to change products and specifications without notice. Permission is hereby expressly
granted to copy this literature for informational purposes only. Copying this material for any other use is strictly prohibited.
WARNING - LIFE SUPPORT APPLICATIONS POLICY - SPT products should not be used within Life Support Systems without the specific
written consent of SPT. A Life Support System is a product or system intended to support or sustain life which, if it fails, can be reasonably
expected to result in significant personal injury or death.
Signal Processing Technologies believes that ultrasonic cleaning of its products may damage the wire bonding, leading to device
failure. It is therefore not recommended, and exposure of a device to such a process will void the product warranty.
