12-Bit, 8-Channel Sampling
ANALOG-TO-DIGITAL CONVERTER
with I2C™ Interface
FEATURES
●8-CHANNEL MULTIPLEXER
●50kHz SAMPLING RATE
●NO MISSING CODES
●2.7V TO 5V OPERATION
●INTERNAL 2.5V REFERENCE
●I2C INTERFACE SUPPORTS:
Standard, Fast, and High-Speed Modes
●TSSOP-16 PACKAGE
APPLICATIONS
●VOLTAGE-SUPPLY MONITORING
●ISOLATED DATA ACQUISITION
●TRANSDUCER INTERFACES
●BATTERY-OPERATED SYSTEMS
●REMOTE DATA ACQUISITION
DESCRIPTION
The ADS7828 is a single-supply, low-power, 12-bit data
acquisition device that features a serial I2C interface and an
8-channel multiplexer. The Analog-to-Digital (A/D) converter
features a sample-and-hold amplifier and internal,
asynchronous clock. The combination of an I2C serial,
2-wire interface and micropower consumption makes the
ADS7828 ideal for applications requiring the A/D converter to
be close to the input source in remote locations and for
applications requiring isolation. The ADS7828 is available in
a TSSOP-16 package.
ADS7828
SBAS181C – NOVEMBER 2001 - REVISED MARCH 2005
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2001-2005, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SAR
2.5V V
REF
Serial
Interface
SDA
Comparator
S/H Amp
REF
IN
/REF
OUT
SCL
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM A0
A1
CDAC
8-Channel
MUX
Buffer
®
ADS7828
I2C is a trademark of Koninklijke Philps Electronics N.V. All other trademarks are the property of their respective owners.
ADS7828
2SBAS181C
www.ti.com
MAXIMUM
INTEGRAL SPECIFIED
LINEARITY PACKAGE TEMPERATURE ORDERING TRANSPORT
PRODUCT ERROR (LSB) PACKAGE-LEAD DESIGNATOR RANGE NUMBER MEDIA, QUANTITY
ADS7828E ±2 TSSOP-16 PW –40°C to +85°C ADS7828E/250 Tape and Reel, 250
"""""ADS7828E/2K5 Tape and Reel, 2500
ADS7828EB ±1 TSSOP-16 PW –40°C to +85°C ADS7828EB/250 Tape and Reel, 250
"""""ADS7828EB/2K5 Tape and Reel, 2500
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this data sheet, or see the TI web site at www.ti.com.
PACKAGE/ORDERING INFORMATION(1)
ABSOLUTE MAXIMUM RATINGS(1)
+VDD to GND ........................................................................ –0.3V to +6V
Digital Input Voltage to GND ................................. –0.3V to +VDD + 0.3V
Operating Temperature Range ......................................–40°C to +105°C
Storage Temperature Range .........................................–65°C to +150°C
Junction Temperature (TJ max) .................................................... +150°C
TSSOP Package
Power Dissipation.................................................... (TJ max – TA)/
θ
JA
θ
JA Thermal Impedance ........................................................ 240°C/W
Lead Temperature, Soldering
Vapor Phase (60s) ............................................................ +215°C
Infrared (15s)..................................................................... +220°C
NOTE: (1) Stresses above those listed under
Absolute Maximum Ratings
may
cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas
Instruments recommends that all integrated circuits be handled
with appropriate precautions. Failure to observe proper han-
dling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PIN CONFIGURATION
Top View TSSOP
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1 CH0 Analog Input Channel 0
2 CH1 Analog Input Channel 1
3 CH2 Analog Input Channel 2
4 CH3 Analog Input Channel 3
5 CH4 Analog Input Channel 4
6 CH5 Analog Input Channel 5
7 CH6 Analog Input Channel 6
8 CH7 Analog Input Channel 7
9 GND Analog Ground
10 REFIN / REFOUT Internal +2.5V Reference, External Reference Input
11 COM Common to Analog Input Channel
12 A0 Slave Address Bit 0
13 A1 Slave Address Bit 1
14 SCL Serial Clock
15 SDA Serial Data
16 +VDD Power Supply, 3.3V Nominal
1
2
3
4
5
6
7
8
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
+V
DD
SDA
SCL
A1
A0
COM
REF
IN
/ REF
OUT
GND
16
15
14
13
12
11
10
9
ADS7828
ADS7828 3
SBAS181C www.ti.com
ANALOG INPUT
Full-Scale Input Scan Positive Input - Negative Input 0 VREF 0V
REF V
Absolute Input Range Positive Input –0.2 +VDD + 0.2 –0.2 +VDD + 0.2 V
Negative Input –0.2 +0.2 –0.2 +0.2 V
Capacitance 25 25 pF
Leakage Current ±1±1µA
SYSTEM PERFORMANCE
No Missing Codes 12 12 Bits
Integral Linearity Error ±1.0 ±2±0.5 ±1LSB
(1)
Differential Linearity Error ±1.0 ±0.5 –1, +2 LSB
Offset Error ±1.0 ±3±0.75 ±2 LSB
Offset Error Match ±0.2 ±1±0.2 ±1 LSB
Gain Error ±1.0 ±4±0.75 ±3 LSB
Gain Error Match ±0.2 ±1±0.2 ±1 LSB
Noise 33 33 µVRMS
Power-Supply Rejection 82 82 dB
SAMPLING DYNAMICS
Throughput Frequency High Speed Mode: SCL = 3.4MHz 50 50 kHz
Fast Mode: SCL = 400kHz 8 8
Standard Mode, SCL = 100kHz 2 2 kHz
Conversion Time 66µs
AC ACCURACY
Total Harmonic Distortion VIN = 2.5VPP at 10kHz –82 –82 dB(2)
Signal-to-Ratio VIN = 2.5VPP at 10kHz 72 72 dB
Signal-to-(Noise+Distortion) Ratio VIN = 2.5VPP at 10kHz 71 71 dB
Spurious-Free Dynamic Range VIN = 2.5VPP at 10kHz 86 86 dB
Isolation Channel-to-Channel 120 120 dB
VOLTAGE REFERENCE OUTPUT
Range 2.475 2.5 2.525 2.475 2.5 2.525 V
Internal Reference Drift 15 15 ppm/°C
Output Impedance Internal Reference ON 110 110 Ω
Internal Reference OFF 1 1 GΩ
Quiescent Current Int. Ref. ON, SCL and SDA pulled HIGH 85 0 850 µA
VOLTAGE REFERENCE INPUT
Range 0.05 VDD 0.05 VDD V
Resistance 11GΩ
Current Drain High Speed Mode: SCL= 3.4MHz 20 20 µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS CMOS
Logic Levels: VIH +VDD • 0.7 +VDD + 0.5 +VDD • 0.7 +VDD + 0.5 V
VIL –0.3 +VDD • 0.3 –0.3 +VDD • 0.3 V
VOL Min. 3mA Sink Current 0.4 0.4 V
Input Leakage: IIH VIH = +VDD +0.5 10 10 µA
IIL VIL = -0.3 –10 –10 µA
Data Format Straight Straight
Binary Binary
ADS7828 HARDWARE ADDRESS 10010 10010 Binary
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage, +VDD Specified Performance 2.7 3.6 2.7 3.6 V
Quiescent Current High Speed Mode: SCL = 3.4MHz 225 320 225 320 µA
Fast Mode: SCL = 400kHz 100 100 µA
Standard Mode, SCL = 100kHz 60 60 µA
Power Dissipation High Speed Mode: SCL = 3.4MHz 675 1000 675 1000 µW
Fast Mode: SCL = 400kHz 300 300 µW
Standard Mode, SCL = 100kHz 180 180 µW
Power-Down Mode High Speed Mode: SCL = 3.4MHz 70 70 µA
w/Wrong Address Selected Fast Mode: SCL = 400kHz 25 25 µA
Standard Mode, SCL = 100kHz 6 6 µA
Full Power-Down SCL Pulled HIGH, SDA Pulled HIGH 400 3000 400 3000 nA
TEMPERATURE RANGE
Specified Performance –40 85 –40 85 °C
ELECTRICAL CHARACTERISTICS: +2.7V
At TA = –40°C to +85°C, +VDD = +2.7V, VREF = +2.5V, SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted.
ADS7828E ADS7828EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
NOTES: (1) LSB means Least Significant Bit. With VREF equal to 2.5V, 1LSB is 610µV.
(2) THD measured out to the 9th-harmonic.
ADS7828
4SBAS181C
www.ti.com
NOTES: (1)
LSB means Least Significant Bit. With VREF equal to 5.0V, 1LSB is 1.22mV.
(2) THD measured out to the 9th-harmonic.
ANALOG INPUT
Full-Scale Input Scan Positive Input - Negative Input 0 VREF 0V
REF V
Absolute Input Range Positive Input –0.2 +VDD + 0.2 –0.2 +VDD + 0.2 V
Negative Input –0.2 +0.2 –0.2 +0.2 V
Capacitance 25 25 pF
Leakage Current ±1±1µA
SYSTEM PERFORMANCE
No Missing Codes 12 12 Bits
Integral Linearity Error ±1.0 ±2±0.5 ±1LSB
(1)
Differential Linearity Error ±1.0 ±0.5 –1, +2 LSB
Offset Error ±1.0 ±3±0.75 ±2 LSB
Offset Error Match ±1±1 LSB
Gain Error ±1.0 ±3±0.75 ±2 LSB
Gain Error Match ±1±1 LSB
Noise 33 33 µVRMS
Power-Supply Rejection 82 82 dB
SAMPLING DYNAMICS
Throughput Frequency High Speed Mode: SCL = 3.4MHz 50 50 kHz
Fast Mode: SCL = 400kHz 8 8 kHz
Standard Mode, SCL = 100kHz 2 2 kHz
Conversion Time 66µs
AC ACCURACY
Total Harmonic Distortion VIN = 2.5VPP at 10kHz –82 –82 dB(2)
Signal-to-Ratio VIN = 2.5VPP at 10kHz 72 72 dB
Signal-to-(Noise+Distortion) Ratio VIN = 2.5VPP at 10kHz 71 71 dB
Spurious-Free Dynamic Range VIN = 2.5VPP at 10kHz 86 86 dB
Isolation Channel-to-Channel 120 120 dB
VOLTAGE REFERENCE OUTPUT
Range 2.475 2.5 2.525 2.475 2.5 2.525 V
Internal Reference Drift 15 15 ppm/°C
Output Impedance Internal Reference ON 110 110 Ω
Internal Reference OFF 1 1 GΩ
Quiescent Current Int. Ref. ON, SCL and SDA pulled HIGH 1300 1300 µA
VOLTAGE REFERENCE INPUT
Range 0.05 VDD 0.05 VDD V
Resistance 11GΩ
Current Drain High Speed Mode: SCL = 3.4MHz 20 20 µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS CMOS
Logic Levels: VIH +VDD • 0.7 +VDD + 0.5 +VDD • 0.7 +VDD + 0.5 V
VIL –0.3 +VDD • 0.3 –0.3 +VDD • 0.3 V
VOL Min. 3mA Sink Current 0.4 0.4 V
Input Leakage: IIH VIH = +VDD +0.5 10 10 µA
IIL VIL = -0.3 –10 –10 µA
Data Format Straight Straight
Binary Binary
ADS7828 HARDWARE ADDRESS 10010 10010 Binary
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage, +VDD Specified Performance 4.75 5 5.25 4.75 5 5.25 V
Quiescent Current High Speed Mode: SCL = 3.4MHz 750 1000 750 1000 µA
Fast Mode: SCL = 400kHz 300 300 µA
Standard Mode, SCL = 100kHz 150 150 µA
Power Dissipation High Speed Mode: SCL = 3.4MHz 3.75 5 3.75 5 mW
Fast Mode: SCL = 400kHz 1.5 1.5 mW
Standard Mode, SCL = 100kHz 0.75 0.75 mW
Power-Down Mode High Speed Mode: SCL = 3.4MHz 400 400 µA
w/Wrong Address Selected Fast Mode: SCL = 400kHz 150 150 µA
Standard Mode, SCL = 100kHz 35 35 µA
Full Power-Down SCL Pulled HIGH, SDA Pulled HIGH 400 3000 400 3000 nA
TEMPERATURE RANGE
Specified Performance –40 +85 –40 +85 °C
ELECTRICAL CHARACTERISTICS: +5V
At TA = –40°C to +85°C, +VDD = +5.0V, VREF = External +5.0V, SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted.
ADS7828E ADS7828EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
ADS7828 5
SBAS181C www.ti.com
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
SCL Clock Frequency fSCL Standard Mode 100 kHz
Fast Mode 400 kHz
High-Speed Mode, CB = 100pF max 3.4 MHz
High-Speed Mode, CB = 400pF max 1.7 MHz
Bus Free Time Between a STOP and tBUF Standard Mode 4.7 µs
START Condition Fast Mode 1.3 µs
Hold Time (Repeated) START tHD;STA Standard Mode 4.0 µs
Condition Fast Mode 600 ns
High-Speed Mode 160 ns
LOW Period of the SCL Clock tLOW Standard Mode 4.7 µs
Fast Mode 1.3 µs
High-Speed Mode, CB = 100pF max(2) 160 ns
High-Speed Mode, CB = 400pF max(2) 320 ns
HIGH Period of the SCL Clock tHIGH Standard Mode 4.0 µs
Fast Mode 600 ns
High-Speed Mode, CB = 100pF max(2) 60 ns
High-Speed Mode, CB = 400pF max(2) 120 ns
Setup Time for a Repeated START tSU;STA Standard Mode 4.7 µs
Condition Fast Mode 600 ns
High-Speed Mode 160 ns
Data Setup Time tSU;DAT Standard Mode 250 ns
Fast Mode 100 ns
High-Speed Mode 10 ns
Data Hold Time tHD;DAT Standard Mode 0 3.45 µs
Fast Mode 0 0.9 µs
High-Speed Mode, CB = 100pF max(2) 0(3) 70 ns
High-Speed Mode, CB = 400pF max(2) 0(3) 150 ns
Rise Time of SCL Signal tRCL Standard Mode 1000 ns
Fast Mode 20 + 0.1CB300 ns
High-Speed Mode, CB = 100pF max(2) 10 40 ns
High-Speed Mode, CB = 400pF max(2) 20 80 ns
Rise Time of SCL Signal After a tRCL1 Standard Mode 1000 ns
Repeated START Condition and Fast Mode 20 + 0.1CB300 ns
After an Acknowledge Bit High-Speed Mode, CB = 100pF max(2) 10 80 ns
High-Speed Mode, CB = 400pF max(2) 20 160 ns
Fall Time of SCL Signal tFCL Standard Mode 300 ns
Fast Mode 20 + 0.1CB300 ns
High-Speed Mode, CB = 100pF max(2) 10 40 ns
High-Speed Mode, CB = 400pF max(2) 20 80 ns
TIMING CHARACTERISTICS(1)
At TA = –40°C to +85°C, +VDD = +2.7V, unless otherwise noted.
TIMING DIAGRAM
tR
tBUF
tLOW tFtHD; STA tSP
tHD; STA
tSU; STA
tHD; DAT tSU; DAT
tHIGH
tSU; STO
SCL
SDA
START REPEATED
START
STOP
NOTES: (1) All values referred to VIHMIN and VILMAX levels.
(2) For bus line loads CB between 100pF and 400pF the timing parameters must be linearly interpolated.
(3) A device must internally provide a data hold time to bridge the undefined part between VIH and VIL of the falling edge of the SCLH signal. An
input circuit with a threshold as low as possible for the falling edge of the SCLH signal minimizes this hold time.
ADS7828
6SBAS181C
www.ti.com
Rise Time of SDA Signal tRDA Standard Mode 1000 ns
Fast Mode 20 + 0.1CB300 ns
High-Speed Mode, CB = 100pF max(2) 10 80 ns
High-Speed Mode, CB = 400pF max(2) 20 160 ns
Fall Time of SDA Signal tFDA Standard Mode 300 ns
Fast Mode 20 + 0.1CB300 ns
High-Speed Mode, CB = 100pF max(2) 10 80 ns
High-Speed Mode, CB = 400pF max(2) 20 160 ns
Setup Time for STOP Condition tSU; STO Standard Mode 4.0 µs
Fast Mode 600 ns
High-Speed Mode 160 ns
Capacitive Load for SDA and SCL CB400 pF
Line
Pulse Width of Spike Suppressed tSP Fast Mode 50 ns
High-Speed Mode 10 ns
Noise Margin at the HIGH Level for Standard Mode
Each Connected Device (Including VNH Fast Mode 0.2VDD V
Hysteresis) High-Speed Mode
Noise Margin at the LOW Level for Standard Mode
Each Connected Device (Including VNL Fast Mode 0.1VDD V
Hysteresis) High-Speed Mode
NOTES: (1) All values referred to VIHMIN and VILMAX levels.
(2) For bus line loads CB between 100pF and 400pF the timing parameters must be linearly interpolated.
(3) A device must internally provide a data hold time to bridge the undefined part between VIH and VIL of the falling edge of the SCLH signal. An
input circuit with a threshold as low as possible for the falling edge of the SCLH signal minimizes this hold time.
TIMING CHARACTERISTICS(1) (Cont.)
At TA = –40°C to +85°C, +VDD = +2.7V, unless otherwise noted.
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
ADS7828 7
SBAS181C www.ti.com
TYPICAL CHARACTERISTICS
TA = +25°C, VDD = +2.7V, VREF = External +2.5V, f SAMPLE = 50kHz, unless otherwise noted.
0.00
–40.00
–80.00
–120.0
Amplitude (dB)
0102025
Frequency (kHz)
FREQUENCY SPECTRUM
(4096 Point FFT: fIN = 1kHz, 0dB)
2.00
1.50
1.00
0.50
0.00
–0.50
–1.00
–1.50
–2.00
ILE (LSB)
0 1024 2048 3072 4095
Output Code
INTEGRAL LINEARITY ERROR vs CODE
(2.5V Internal Reference)
2.00
1.50
1.00
0.50
0.00
–0.50
–1.00
–1.50
–2.00
DLE (LSB)
0 1024 2048 3072 4095
Output Code
DIFFERENTIAL LINEARITY ERROR vs CODE
(2.5V Internal Reference)
2.00
1.50
1.00
0.50
0.00
–0.50
–1.00
–1.50
–2.00
ILE (LSB)
0 1024 2048 3072 4095
Output Code
INTEGRAL LINEARITY ERROR vs CODE
(2.5V External Reference)
2.00
1.50
1.00
0.50
0.00
–0.50
–1.00
–1.50
–2.00
DLE (LSB)
0 1024 2048 3072 4095
Output Code
DIFFERENTIAL LINEARITY ERROR vs CODE
(2.5V External Reference)
1.5
1.0
0.5
0.0
–0.5
–1.0
–1.5
Delta from 25°C (LSB)
–50 –25 0 25 50 75 100
Temperature (°C)
CHANGE IN OFFSET vs TEMPERATURE
ADS7828
8SBAS181C
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
TA = +25°C, VDD = +2.7V, VREF = External +2.5V, fSAMPLE = 50kHz, unless otherwise noted.
1.5
1.0
0.5
0.0
–0.5
–1.0
–1.5
Delta from 25°C (LSB)
–50 –25 0 25 50 75 100
Temperature (°C)
CHANGE IN GAIN vs TEMPERATURE
2.51875
2.51250
2.50625
2.50000
2.49375
2.48750
2.48125
Internal Reference (V)
–50 –25 0 25 50 75 100
Temperature (°C)
INTERNAL REFERENCE vs TEMPERATURE
750
600
450
300
150
0
–150
Supply Current (nA)
–50 –25 0 25 50 75 100 125
Temperature (°C)
POWER-DOWN SUPPLY CURRENT
vs TEMPERATURE
400
350
300
250
200
150
100
Supply Current (µA)
–50 –25 0 25 50 75 100
Temperature (°C)
SUPPLY CURRENT vs TEMPERATURE
300
250
200
150
100
50
0
Supply Current (µA)
10 100 1k 10k
I
2
C Bus Rate (KHz)
SUPPLY CURRENT vs I
2
C BUS RATE
INTERNAL V
REF
vs TURN-ON TIME
0 200 400 600 800 1000 1200 1400
Turn-On Time (µs)
Internal V
REF
(%)
100
80
60
40
20
0
No Cap
(42µs)
12-Bit Settling 1µF Cap
(1240µs)
12-Bit Settling
ADS7828 9
SBAS181C www.ti.com
FIGURE 1. Simplified I/O of the ADS7828.
THEORY OF OPERATION
The ADS7828 is a classic Successive Approximation Regis-
ter (SAR) A/D converter. The architecture is based on ca-
pacitive redistribution which inherently includes a sample-
and-hold function. The converter is fabricated on a 0.6µ
CMOS process.
The ADS7828 core is controlled by an internally generated
free-running clock. When the ADS7828 is not performing
conversions or being addressed, it keeps the A/D converter
core powered off, and the internal clock does not operate.
The simplified diagram of input and output for the ADS7828
is shown in Figure 1.
ANALOG INPUT
When the converter enters the hold mode, the voltage on the
selected CHx pin is captured on the internal capacitor array.
The input current on the analog inputs depends on the
conversion rate of the device. During the sample period, the
source must charge the internal sampling capacitor (typically
25pF). After the capacitor has been fully charged, there is no
further input current. The amount of charge transfer from the
analog source to the converter is a function of conversion rate.
REFERENCE
The ADS7828 can operate with an internal 2.5V reference or
an external reference. If a +5V supply is used, an external
+5V reference is required in order to provide full dynamic
range for a 0V to +VDD analog input. This external reference
can be as low as 50mV. When using a +2.7V supply, the
internal +2.5V reference will provide full dynamic range for a
0V to +VDD analog input.
As the reference voltage is reduced, the analog voltage
weight of each digital output code is reduced. This is often
referred to as the LSB (least significant bit) size and is equal
to the reference voltage divided by 4096. This means that
any offset or gain error inherent in the A/D converter will
appear to increase, in terms of LSB size, as the reference
voltage is reduced.
The noise inherent in the converter will also appear to increase
with lower LSB size. With a 2.5V reference, the internal noise
of the converter typically contributes only 0.32LSB peak-to-
peak of potential error to the output code. When the external
reference is 50mV, the potential error contribution from the
internal noise will be 50 times larger—16LSBs. The errors due
to the internal noise are Gaussian in nature and can be
reduced by averaging consecutive conversion results.
DIGITAL INTERFACE
The ADS7828 supports the I2C serial bus and data transmis-
sion protocol, in all three defined modes: standard, fast, and
high-speed. A device that sends data onto the bus is defined
as a transmitter, and a device receiving data as a receiver.
The device that controls the message is called a “master.”
The devices that are controlled by the master are “slaves.”
The bus must be controlled by a master device that gener-
ates the serial clock (SCL), controls the bus access, and
generates the START and STOP conditions. The ADS7828
operates as a slave on the I2C bus. Connections to the bus
are made via the open-drain I/O lines SDA and SCL.
Microcontroller
+2.7V to +3.6V
1µF to
10µF
+
2kΩ
2kΩ
5Ω
1µF to
10µF
+
0.1µF
ADS7828
REF
IN
/
REF
OUT
CH0
V
DD
SDA
SCL
A0
A1
GND
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
ADS7828
10 SBAS181C
www.ti.com
FIGURE 2. Basic Operation of the ADS7828.
The following bus protocol has been defined (as shown in
Figure 2):
•Data transfer may be initiated only when the bus is not
busy.
•During data transfer, the data line must remain stable
whenever the clock line is HIGH. Changes in the data line
while the clock line is HIGH will be interpreted as control
signals.
Accordingly, the following bus conditions have been defined:
Bus Not Busy: Both data and clock lines remain HIGH.
Start Data Transfer: A change in the state of the data line,
from HIGH to LOW, while the clock is HIGH, defines a
START condition.
Stop Data Transfer: A change in the state of the data line,
from LOW to HIGH, while the clock line is HIGH, defines the
STOP condition.
Data Valid: The state of the data line represents valid data,
when, after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal. There is one
clock pulse per bit of data.
Each data transfer is initiated with a START condition and
terminated with a STOP condition. The number of data bytes
transferred between START and STOP conditions is not
limited and is determined by the master device. The informa-
tion is transferred byte-wise and each receiver acknowl-
edges with a ninth-bit.
Within the I2C bus specifications a standard mode (100kHz
clock rate), a fast mode (400kHz clock rate), and a high-
speed mode (3.4MHz clock rate) are defined. The ADS7828
works in all three modes.
Acknowledge: Each receiving device, when addressed, is
obliged to generate an acknowledge after the reception of
each byte. The master device must generate an extra clock
pulse that is associated with this acknowledge bit.
A device that acknowledges must pull down the SDA line
during the acknowledge clock pulse in such a way that the
SDA line is stable LOW during the HIGH period of the
acknowledge clock pulse. Of course, setup and hold times
must be taken into account. A master must signal an end of
data to the slave by not generating an acknowledge bit on the
last byte that has been clocked out of the slave. In this case,
the slave must leave the data line HIGH to enable the master
to generate the STOP condition.
Figure 2 details how data transfer is accomplished on the I2C
bus. Depending upon the state of the R/W bit, two types of
data transfer are possible:
1. Data transfer from a master transmitter to a slave
receiver. The first byte transmitted by the master is the
slave address. Next follows a number of data bytes. The
slave returns an acknowledge bit after the slave address
and each received byte.
2. Data transfer from a slave transmitter to a master
receiver. The first byte, the slave address, is transmitted
by the master. The slave then returns an acknowledge bit.
Next, a number of data bytes are transmitted by the slave
to the master. The master returns an acknowledge bit
after all received bytes other than the last byte. At the end
of the last received byte, a not-acknowledge is returned.
The master device generates all of the serial clock pulses
and the START and STOP conditions. A transfer is ended
with a STOP condition or a repeated START condition. Since
a repeated START condition is also the beginning of the next
serial transfer, the bus will not be released.
The ADS7828 may operate in the following two modes:
•Slave Receiver Mode: Serial data and clock are received
through SDA and SCL. After each byte is received, an
acknowledge bit is transmitted. START and STOP condi-
tions are recognized as the beginning and end of a serial
transfer. Address recognition is performed by hardware
after reception of the slave address and direction bit.
•Slave Transmitter Mode: The first byte (the slave ad-
dress) is received and handled as in the slave receiver
mode. However, in this mode the direction bit will indicate
that the transfer direction is reversed. Serial data is trans-
mitted on SDA by the ADS7828 while the serial clock is
input on SCL. START and STOP conditions are recog-
nized as the beginning and end of a serial transfer.
SDA
SCL
12 76 8 9 1 2 3-8 8 9
Slave Address
MSB
Repeated If More Bytes Are Transferred
R/W
Direction
Bit
Acknowledgement
Signal from
Receiver
Acknowledgement
Signal from
Receiver
START
Condition
ACK ACK
STOP Condition
or Repeated
START Condition
ADS7828 11
SBAS181C www.ti.com
ADDRESS BYTE COMMAND BYTE
The address byte is the first byte received following the
START condition from the master device. The first five bits
(MSBs) of the slave address are factory pre-set to 10010.
The next two bits of the address byte are the device select
bits, A1 and A0. Input pins (A1-A0) on the ADS7828 deter-
mine these two bits of the device address for a particular
ADS7828. A maximum of four devices with the same pre-set
code can therefore be connected on the same bus at one
time.
The A1-A0 Address Inputs can be connected to VDD or digital
ground. The device address is set by the state of these pins
upon power-up of the ADS7828.
The last bit of the address byte (R/W) defines the operation
to be performed. When set to a ‘1’ a read operation is
selected; when set to a ‘0’ a write operation is selected.
Following the START condition the ADS7828 monitors the
SDA bus, checking the device type identifier being transmit-
ted. Upon receiving the 10010 code, the appropriate device
select bits, and the R/W bit, the slave device outputs an
acknowledge signal on the SDA line.
MSB654321LSB
SD C2 C1 C0 PD1 PD0 X X
The ADS7828 operating mode is determined by a command
byte which is illustrated above.
SD: Single-Ended/Differential Inputs
0: Differential Inputs
1: Single-Ended Inputs
C2 - C0: Channel Selections
PD1 - 0: Power-Down Selection
X: Unused
See Table I for a power-down selection summary.
See Table II for a channel selection control summary.
MSB654321LSB
10010A1A0R/W
PD1 PD0 DESCRIPTION
0 0 Power Down Between A/D Converter Conversions
0 1 Internal Reference OFF and A/D Converter ON
1 0 Internal Reference ON and A/D Converter OFF
1 1 Internal Reference ON and A/D Converter ON
CHANNEL SELECTION CONTROL
SD C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM
0000+IN–IN —————— —
0001——+IN –IN ———— —
0010————+IN –IN —— —
0011——————+IN –IN —
0100–IN +IN —————— —
0101——–IN +IN ———— —
0110————–IN +IN —— —
0111——————–IN +IN —
1000+IN———————–IN
1001——+IN ————— –IN
1010————+IN —— — –IN
1011——————+IN —–IN
1100—+IN ——————–IN
1101———+IN ————–IN
1110—————+IN ——–IN
1111———————+IN –IN
TABLE II. Channel Selection Control Addressed by Command Byte.
TABLE I. Power-Down Selection
ADS7828
12 SBAS181C
www.ti.com
INITIATING CONVERSION
Provided the master has write-addressed it, the ADS7828
turns on the A/D converter’s section and begins conversions
when it receives BIT 4 of the command byte shown in the
Command Byte. If the command byte is correct, the ADS7828
will return an ACK condition.
READING DATA
Data can be read from the ADS7828 by read-addressing the
part (LSB of address byte set to 1) and receiving the
transmitted bytes. Converted data can only be read from the
ADS7828 once a conversion has been initiated as described
in the preceding section.
Each 12-bit data word is returned in two bytes, as shown
below, where D11 is the MSB of the data word, and D0 is the
LSB. Byte 0 is sent first, followed by Byte 1.
FIGURE 3. Typical Read Sequence in F/S Mode.
Sr A1
10010 A
0RA0000D
11 D10 D9D8AD
7D6 . . .D1D0NP
SA
1
10010 A
0WASDC
2C1C0PD1PD0XXA
From Master to Slave A = acknowledge (SDA LOW)
N = not acknowledge (SDA HIGH)
S = START Condition
P = STOP Condition
Sr = repeated START condition
W = '0' (WRITE)
R = '1' (READ)
From Slave to Master
Write-Addressing Byte Command Byte
ADC Power-Down Mode ADC Sampling Mode
ADC Converting Mode ADC Power-Down Mode
(depending on power-down selection bits)
Read-Addressing Byte 2 x (8 Bits + ack/not-ack) See Note (1)
NOTE: (1) To secure bus operation and loop back to the stage of write-addressing for next conversion, use repeated START.
MSB6 54321LSB
BYTE 0 0 0 0 0 D11 D10 D9 D8
BYTE 1 D7 D6 D5 D4 D3 D2 D1 D0
READING IN F/S MODE
Figure 3 describes the interaction between the master and
the slave ADS7828 in Fast or Standard (F/S) mode. At the
end of reading conversion data the ADS7828 can be issued
a repeated START condition by the master to secure bus
operation for subsequent conversions of the A/D converter.
This would be the most efficient way to perform continuous
conversions.
ADS7828 13
SBAS181C www.ti.com
FIGURE 4. Typical Read Sequence in HS Mode.
READING IN HS MODE
High Speed (HS) mode is fast enough that codes can be
read out one at a time. In HS mode, there is not enough time
for a single conversion to complete between the reception of
a repeated START condition and the read-addressing byte,
so the ADS7828 stretches the clock after the read-address-
ing byte has been fully received, holding it LOW until the
conversion is complete.
See Figure 4 for a typical read sequence for HS mode.
Included in the read sequence is the shift from F/S to HS
modes. It may be desirable to remain in HS mode after
reading a conversion; to do this, issue a repeated START
instead of a STOP at the end of the read sequence, since a
STOP causes the part to return to F/S mode.
Sr A1
10010 A
0RA
SX00001 XXN
Sr A1
10010 A
0WASDC
2C1C0PD1PD0XXA
0000D
11 D10 D9D8AD
7D6 . . .D1D0NP
F/S Mode
HS Mode Master Code
HS Mode Enabled
HS Mode Enabled
ADC Power-Down Mode ADC Sampling Mode
ADC Converting Mode
Command ByteWrite-Addressing Byte
Read-Addressing Byte
HS Mode Enabled Return to F/S Mode(1)
ADC Power-Down Mode
(depending on power-down selection bits)
2 x (8 Bits + ack/not-ack)
From Master to Slave A = acknowledge (SDA LOW)
N = not acknowledge (SDA HIGH)
S = START Condition
P = STOP Condition
Sr = repeated START condition
W = '0' (WRITE)
R = '1' (READ)
From Slave to Master
NOTES: (1) To remain in HS mode, use repeated START instead of STOP.
(2) SCLH is SCL in HS mode.
SCLH(2) is stretched LOW waiting for data conversion
ADS7828
14 SBAS181C
www.ti.com
Internal V
REF
vs Turn-On Time
Typical Characteristic plot.
If the PD1 bit has been set to logic ‘0’ while using the
ADS7828, then the settling time must be reconsidered
after PD1 is set to logic ‘1’. In other words, whenever the
internal reference is turned on after it has been turned off,
the settling time must be long enough to get 12-bit accu-
racy conversion.
3) When the internal reference is off, it is not turned on until
both the first Command Byte with PD1 = ‘1’ is sent
and
then
a STOP condition or repeated START condition is
issued. (The actual turn-on time occurs once the STOP or
repeated START condition is issued.) Any Command Byte
with PD1 = ‘1’ issued after the internal reference is turned
on serves only to keep the internal reference on. Other-
wise, the internal reference would be turned off by any
Command Byte with PD1 = ‘0’.
The example in Figure 5 can be generalized for a HS mode
conversion cycle by simply swapping the timing of the con-
version cycle.
If using an external reference, PD1 must be set to ‘0’, and the
external reference must be settled. The typical sequence in
Figure 3 or Figure 4 can then be used.
READING WITH REFERENCE ON/OFF
The internal reference defaults to off when the ADS7828
power is on. To turn the internal reference on or off, see
Table I. If the reference (internal or external) is constantly
turned on and off, a proper amount of settling time must be
added before a normal conversion cycle can be started. The
exact amount of settling time needed varies depending on
the configuration.
See Figure 5 for an example of the proper internal reference
turn-on sequence before issuing the typical read sequences
required for the F/S mode when an internal reference is
used.
When using an internal reference, there are three things that
must be done:
1) In order to use the internal reference, the PD1 bit of
Command Byte must always be set to logic ‘1’ for each
sample conversion that is issued by the sequence, as
shown in Figure 3.
2) In order to achieve 12-bit accuracy conversion when
using the internal reference, the internal reference
settling time must be considered, as shown in the
FIGURE 5. Internal Reference Turn-On Sequence and Typical Read Sequence (F/S mode shown).
Sr A1
10010 A
0RA0000D
11 D10 D9D8AD
7D6 . . .D1D0NP
SA
1
1001 10A
0WASDC
2C1C0PD0XXA
SA
1
1001 10A
0WAXXXXXXXAP
Wait until the required
settling time is reached
Internal Reference Turn-On Sequence
Settled Internal Reference
Settled Internal Reference
Internal Reference
Turn-On
Settling Time
Typical Read
Sequence(1)
in F/S Mode
From Master to Slave A = acknowledge (SDA LOW)
N = not acknowledge (SDA HIGH)
S = START Condition
P = STOP Condition
Sr = repeated START condition
W = '0' (WRITE)
R = '1' (READ)
From Slave to Master
Command ByteWrite-Addressing Byte
Command ByteWrite-Addressing Byte
ADC Power-Down Mode ADC Sampling Mode
ADC Converting Mode ADC Power-Down Mode
(depending on power-down selection bits)
Read-Addressing Byte 2 x (8 Bits + ack/not-ack) see
note
(2)
NOTES: (1) Typical read sequences can be reused after the internal reference is settled.
(2) To secure bus operation and loop back to the stage of write-addressing for next conversion, use repeated START.
ADS7828 15
SBAS181C www.ti.com
LAYOUT
For optimum performance, care should be taken with the
physical layout of the ADS7828 circuitry. The basic SAR
architecture is sensitive to glitches or sudden changes on the
power supply, reference, ground connections, and digital
inputs that occur just prior to latching the output of the analog
comparator. Therefore, during any single conversion for an
“n-bit” SAR converter, there are n “windows” in which large
external transient voltages can easily affect the conversion
result. Such glitches might originate from switching power
supplies, nearby digital logic, and high-power devices.
With this in mind, power to the ADS7828 should be clean and
well-bypassed. A 0.1µF ceramic bypass capacitor should be
placed as close to the device as possible. A 1µF to 10µF
capacitor may also be needed if the impedance of the
connection between +VDD and the power supply is high.
The ADS7828 architecture offers no inherent rejection of
noise or voltage variation in regards to using an external
reference input. This is of particular concern when the
reference input is tied to the power supply. Any noise and
ripple from the supply will appear directly in the digital results.
While high-frequency noise can be filtered out, voltage varia-
tion due to line frequency (50Hz or 60Hz) can be difficult to
remove.
The GND pin should be connected to a clean ground point.
In many cases, this will be the “analog” ground. Avoid
connections that are too near the grounding point of a
microcontroller or digital signal processor. The ideal layout
will include an analog ground plane dedicated to the con-
verter and associated analog circuitry.
PACKAGE OPTION ADDENDUM
www.ti.com 21-May-2010
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
ADS7828E/250 ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
ADS7828E/250G4 ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
ADS7828E/2K5 ACTIVE TSSOP PW 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
ADS7828E/2K5G4 ACTIVE TSSOP PW 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
ADS7828EB/250 ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
ADS7828EB/250G4 ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
ADS7828EB/2K5 ACTIVE TSSOP PW 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
ADS7828EB/2K5G4 ACTIVE TSSOP PW 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
PACKAGE OPTION ADDENDUM
www.ti.com 21-May-2010
Addendum-Page 2
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF ADS7828 :
•Automotive: ADS7828-Q1
NOTE: Qualified Version Definitions:
•Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
ADS7828E/250 TSSOP PW 16 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1
ADS7828E/2K5 TSSOP PW 16 2500 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1
ADS7828EB/250 TSSOP PW 16 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1
ADS7828EB/2K5 TSSOP PW 16 2500 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
ADS7828E/250 TSSOP PW 16 250 210.0 185.0 35.0
ADS7828E/2K5 TSSOP PW 16 2500 367.0 367.0 35.0
ADS7828EB/250 TSSOP PW 16 250 210.0 185.0 35.0
ADS7828EB/2K5 TSSOP PW 16 2500 367.0 367.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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