1FEATURES
2• Complete Front-End for Bridge Sensors
• Internal Amplifier, Gain of 128
• Internal Oscillator
• Low-Side Power Switch for Bridge Sensor
• Low Noise: 35nVrms
• Selectable Data Rates: 10SPS or 80SPS
• Simultaneous 50Hz and 60Hz Rejection at
10SPS
• Input EMI Filter
• External Voltage Reference up to 5V for
Ratiometric Measurements
• Simple, Pin-Driven Control
• Two-Wire Serial Digital Interface
• Supply Range: 3V to 5.3V
• Package: SOIC-16
• Temperature Range: –40°C to +85°C

APPLICATIONS
• Weigh Scales
• Strain Gauges
• Load Cells
• Industrial Process Control

DESCRIPTION
The ADS1231 is a precision, 24-bit analog-to-digital
converter (ADC). With an onboard low-noise amplifier, onboard oscillator, precision third-order 24-
bit delta-sigma (ΔΣ) modulator, and bridge power
switch, the ADS1231 provides a complete front-end
solution for bridge sensor applications including weigh scales, strain gauges, and load cells.
The low-noise amplifier has a gain of 128, supporting a full-scale differential input of ±19.5mV. The ΔΣ ADC
has 24-bit resolution and is comprised of a third-order
modulator and fourth-order digital filter. Two data
rates are supported: 10SPS (with both 50Hz and
60Hz rejection) and 80SPS. The ADS1231 can be put in a low-power standby mode or shut off
completely in power-down mode.
The ADS1231 is controlled by dedicated pins; there
are no digital registers to program. Data are output
over an easily-isolated serial interface that connects
directly to the MSP430 and other microcontrollers.
The ADS1231 is available in an SO-16 package and
is specified from –40°C to +85°C.