A
D
S
1
2
1
2
ADS1212
ADS1213
A
D
S
1
2
1
3
A
D
S1212
A
D
S
1
2
1
3
A
D
S1213
SBAS064B – JANUARY 1996 – REVISED FEBRUARY 2004
22-Bit ANALOG-TO-DIGITAL CONVERTER
DESCRIPTION
FEATURES
● DELTA-SIGMA A/D CONVERTER
● 22 BITS NO MISSING CODES
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.
● 20 BITS EFFECTIVE RESOLUTION AT 10Hz
AND 16 BITS AT 1000Hz
● LOW POWER: 1.4mW
● DIFFERENTIAL INPUTS
● PROGRAMMABLE GAIN AMPLIFIER
● SPI™ COMPATIBLE SSI INTERFACE
● PROGRAMMABLE CUTOFF FREQUENCY
UP TO 6.25kHz
● INTERNAL/EXTERNAL REFERENCE
● ON-CHIP SELF-CALIBRATION
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.
● ADS1213 INCLUDES 4-CHANNEL MUX
APPLICATIONS
● INDUSTRIAL PROCESS CONTROL
● INSTRUMENTATION
● BLOOD ANALYSIS
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.
● SMART TRANSMITTERS
● PORTABLE INSTRUMENTS
● WEIGH SCALES
● PRESSURE TRANSDUCERS
AGND AVDD REFOUT
REFIN
VBIAS
XIN
XOUT
+2.5V
Reference
+3.3V Bias
Generator
Clock Generator
DGND
DVDD
AIN1P
A
IN1N
AIN2P
IN2N
IN3P
AIN3N
IN4P
Micro Controller
AIN
P
Second-Order
∆∑
Modulator
A
Instruction Register
Command Register
Data Output Register
Offset Register
Third-Order
Digital Filter
PGA
A
MUX
A
INN
Full-Scale Register
A
AIN4N
SCLK
SDIO
Modulator Control
Serial Interface
SDOUT
DSYNC
CS
MODE DRDY
ADS1213 Only
ADS1212, 1213
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