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.