AD S
1212
ADS
121
3
ADS
121
2
ADS1212
ADS1213
A DS
1213
ADS
121
3
SBAS064B – JANUARY 1996 – REVISED FEBRUARY 2004
22-Bit ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
DELTA-SIGMA A/D CONVERTER
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22 BITS NO MISSING CODES
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20 BITS EFFECTIVE RESOLUTION AT 10Hz
AND 16 BITS AT 1000Hz
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LOW POWER: 1.4mW
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DIFFERENTIAL INPUTS
q
PROGRAMMABLE GAIN AMPLIFIER
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SPI
™
COMPATIBLE SSI INTERFACE
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PROGRAMMABLE CUTOFF FREQUENCY
UP TO 6.25kHz
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INTERNAL/EXTERNAL REFERENCE
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ON-CHIP SELF-CALIBRATION
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ADS1213 INCLUDES 4-CHANNEL MUX
DESCRIPTION
The ADS1212 and ADS1213 are precision, wide dynamic
range, delta-sigma Analog-to-Digital (A/D) converters with
24-bit resolution operating from a single +5V supply. The
differential inputs are ideal for direct connection to transduc-
ers or low-level voltage signals. The delta-sigma architec-
ture is used for wide dynamic range and to ensure 22 bits of
no-missing-code performance. An effective resolution of 20
bits is achieved through the use of a very low-noise input
amplifier at conversion rates up to 10Hz. Effective resolu-
tions of 16 bits can be maintained up to a sample rate of
1kHz through the use of the unique Turbo Modulator mode
of operation. The dynamic range of the converters is further
increased by providing a low-noise programmable gain
amplifier with a gain range of 1 to 16 in binary steps.
The ADS1212 and ADS1213 are designed for high-resolution
measurement applications in smart transmitters, industrial
process control, weigh scales, chromatography and portable
instrumentation. Both converters include a flexible synchro-
nous serial interface that is SPI compatible and also offers a
two-wire control mode for low-cost isolation.
The ADS1212 is a single channel converter and is offered in
both DIP-18 and SO-18 packages. The ADS1213 includes a
4-channel input multiplexer and is available in DIP-24,
SO-24, and SSOP-28 packages.
APPLICATIONS
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INDUSTRIAL PROCESS CONTROL
INSTRUMENTATION
BLOOD ANALYSIS
SMART TRANSMITTERS
PORTABLE INSTRUMENTS
WEIGH SCALES
PRESSURE TRANSDUCERS
AGND AV
DD
REF
OUT
REF
IN
V
BIAS
X
IN
X
OUT
A
IN
1P
A
IN
1N
A
IN
2P
A
IN
2N
A
IN
3P
A
IN
3N
A
IN
4P
A
IN
4N
MUX
A
IN
P
+2.5V
Reference
+3.3V Bias
Generator
Clock Generator
DGND
DV
DD
Micro Controller
Second-Order
∆∑
Modulator
Third-Order
Digital Filter
Instruction Register
Command Register
Data Output Register
Offset Register
Full-Scale Register
SCLK
SDIO
SDOUT
PGA
A
IN
N
Modulator Control
Serial Interface
ADS1213 Only
ADS1212, 1213
DSYNC
CS
MODE
DRDY
PATENTS PENDING
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.
All trademarks are the property of their respective owners.
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 © 1996-2004, Texas Instruments Incorporated
www.ti.com
BURR-BROWN [ BURR-BROWN CORPORATION ]
