DS ADC

VREFP

VREFN

CAP

DVDD

GND

AINP

AINN

SCLK

SPEED

DRDY/DOUT

PDWN

AVDD

Internal

Oscillator

G=64

SW

CAP

ADS1131

www.ti.com

SBAS449C – JULY 2009 – REVISED OCTOBER 2013

18-Bit Analog-to-Digital Converter

for Bridge Sensors

Check for Samples: ADS1131

1

FEATURES

DESCRIPTION

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

2

•

Complete Front-End for Bridge Sensors

converter

(ADC).

With

an

onboard,

low-noise

•

Available in an SO Package

amplifier, onboard oscillator, precision 18-bit delta-

•

Internal Amplifier, Gain of 64

sigma (

ΔΣ) ADC, and bridge power switch, the

ADS1131 provides a complete front-end solution for

•

Internal Oscillator

bridge sensor applications including weigh scales,

•

Low-Side Power Switch for Bridge Sensor

strain gauges, and load cells.

•

18-Bit Noise-Free Resolution

The low-noise amplifier has a gain of 64, supporting a

•

Selectable 10SPS or 80SPS Data Rates

full-scale differential input of ±39mV. The

ΔΣ ADC

•

Simultaneous 50Hz and 60Hz Rejection at

has 18-bit effective resolution and is comprised of a

10SPS

third-order modulator and fourth-order digital filter.

Two data rates are supported: 10SPS (with both

•

External Voltage Reference up to 5V for

50Hz and 60Hz rejection) and 80SPS. The ADS1131

Ratiometric Measurements

can be put into a low-power standby mode or shut off

•

Simple, Pin-Driven Control

completely in power-down mode.

•

Two-Wire Serial Digital Interface

The ADS1131 is controlled by dedicated pins; there

•

Supply Range: 3V to 5.3V

are no digital registers to program. Data are output

over an easily-isolated serial interface that connects

•

–40°C to +85°C Temperature Range

directly to the MSP430 and other microcontrollers.

APPLICATIONS

The ADS1131 is available in an SO-16 package and

is specified from –40°C to +85°C.

•

Weigh Scales

•

Strain Gauges

•

Load Cells

•

Industrial Process Control

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.