Complete Front-End for Bridge Sensors
Up to 23.5 Effective Bits
Onboard, Low-Noise PGA
17nV at 10SPS (PGA = 128)
44nV at 80SPS (PGA = 128)
19.2-Bit Noise-Free Resolution at Gain = 64
Over 100dB Simultaneous 50Hz and 60Hz
Low-Drift Onboard Oscillator (±3%)
Optional External Crystal
Selectable Gains of 1, 2, 64, and 128
Easy Ratiometric Measurements–
External Voltage Reference up to 5V
Selectable 10SPS or 80SPS Data Rates
Two-Channel Differential Input with Built-In
Temperature Sensor (ADS1232)
Four-Channel Differential Input (ADS1234)
Simple Serial Digital Interface
Supply Range: 2.7V to 5.3V
–40 C to +105 C Temperature Range
Industrial Process Control
NOTE: (1) A1 for ADS1234, TEMP for ADS1232.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
24-Bit Analog-to-Digital Converter
For Bridge Sensors
The ADS1232 and ADS1234 are precision 24-bit
analog-to-digital converters (ADCs). With an onboard,
precision delta-sigma ADC and internal oscillator, the
ADS1232/4 provide a complete front-end solution for
bridge sensor applications including weigh scales,
strain gauges and pressure sensors.
The input multiplexer accepts either two (ADS1232)
or four (ADS1234) differential inputs. The ADS1232
also includes an onboard temperature sensor to
monitor ambient temperature. The onboard, low-noise
PGA has a selectable gain of 1, 2, 64, or 128
supporting a full-scale differential input of ±2.5V,
±1.25V, ±39mV, or ±19.5mV. The delta-sigma ADC
has 23.5-bit effective resolution and is comprised of a
3rd-order modulator and 4th-order digital filter. Two
data rates are supported: 10SPS (with both 50Hz and
60Hz rejection) and 80SPS. The ADS1232/4 can be
clocked externally using an oscillator or a crystal.
There is also an internal oscillator available that
requires no external components. Offset calibration is
performed on-demand and the ADS1232/4 can be
put in a low-power standby mode or shut off
completely in power-down mode. All of the features of
pin-driven control. There are no digital registers to
program in order to simplify software development.
Data are output over an easily-isolated serial
interface that connects directly to the MSP430 and
The ADS1232 is available in a TSSOP-24 package
and the ADS1234 is in a TSSOP-28. Both are fully
specified from -40 C to +105 C.
1, 2, 64, or 128
SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008
Copyright © 2005–2008, Texas Instruments Incorporated