ADS1231 24-Bit, 80SPS, 1-Ch Delta-Sigma ADC for Resistive Bridge Sensors & Weigh Scales | TI.com

ADS1231
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24-Bit, 80SPS, 1-Ch Delta-Sigma ADC for Resistive Bridge Sensors & Weigh Scales

24-Bit, 80SPS, 1-Ch Delta-Sigma ADC for Resistive Bridge Sensors & Weigh Scales - ADS1231
Datasheet
 

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 () 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 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.

Features

  • 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

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WEBENCH® Designer ADS1231



Parametrics

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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group Approx. price (US$) Power consumption (Typ) (mW) Package size: mm2:W x L (PKG) Architecture Input type Multi-channel configuration Reference mode Features Input range (Max) (V) Input range (Min) (V) Analog voltage AVDD (Min) (V) Analog voltage AVDD (Max) (V) Digital supply (Min) (V) Digital supply (Max) (V) Rating
ADS1231 Order now 24     0.08     1     SPI     -40 to 85     SOIC | 16     2.50 | 1ku     5     16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)     Delta-Sigma     Differential
Single-Ended    
    Ext     50/60 Hz Rejection
Oscillator
PGA    
0.0195     0     3     5.3     3     5.3     Catalog    
ADS1130 Order now 18     0.08     1     SPI     -40 to 85     TSSOP | 16     2.50 | 1ku     2.9     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     Delta-Sigma     Differential
Single-Ended    
    Ext     50/60 Hz Rejection
Oscillator
PGA    
0.041     0     2.7     5.3     2.7     5.3     Catalog    
ADS1131 Order now 18     0.08     1     SPI     -40 to 85     SOIC | 16     2.10 | 1ku     2.9     16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)     Delta-Sigma     Differential
Single-Ended    
    Ext     50/60 Hz Rejection
Oscillator
PGA    
0.041     0     3     5.3     3     5.3     Catalog    
ADS1230 Order now 20     0.08     1     SPI     -40 to 85     TSSOP | 16     2.95 | 1ku     2.9     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     Delta-Sigma     Differential
Single-Ended    
    Ext     50/60 Hz Rejection
Oscillator
PGA    
0.039     0     2.7     5.3     2.7     5.3