FEATURES

• Complete Front-End for Bridge Sensors

• Available in an SO Package

• Internal Amplifier, Gain of 64

• Internal Oscillator

• Low-Side Power Switch for Bridge Sensor

• 18-Bit Noise-Free Resolution

• Selectable 10SPS or 80SPS Data Rates

• Simultaneous 50Hz and 60Hz Rejection at

10SPS

• External Voltage Reference up to 5V for

Ratiometric Measurements

• Simple, Pin-Driven Control

• Two-Wire Serial Digital Interface

• Supply Range: 3V to 5.3V

• –40°C to +85°C Temperature Range

APPLICATIONS

• Weigh Scales

• Strain Gauges

• Load Cells

• Industrial Process Control

DESCRIPTION

The ADS1131 is a precision, 18-bit analog-to-digital

converter (ADC). With an onboard, low-noise amplifier, onboard oscillator, precision 18-bit delta-

sigma (ΔΣ) ADC, and bridge power switch, the

ADS1131 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 64, supporting a full-scale differential input of ±39mV. The ΔΣ ADC

has 18-bit effective 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 ADS1131 can be put into a low-power standby mode or shut off

completely in power-down mode.

The ADS1131 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 ADS1131 is available in an SO-16 package and

is specified from –40°C to +85°C.