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

ADS1231 (ACTIVE)

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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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
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 ADS1130 ADS1131 ADS1230 ADS1232 ADS1234
24     18     18     20     24     24    
0.08     0.08     0.08     0.08     0.08     0.08    
1     1     1     1     2     4    
SPI     SPI     SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 105     -40 to 105    
SOIC | 16     TSSOP | 16     SOIC | 16     TSSOP | 16     TSSOP | 24     TSSOP | 28    
2.50 | 1ku     2.50 | 1ku     2.10 | 1ku     2.95 | 1ku     3.90 | 1ku     4.25 | 1ku    
5     2.9     2.9     2.9     4.3     4.3    
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     24TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 24)     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential     Differential    
   
   
   
   
Multiplexed     Multiplexed    
Ext     Ext     Ext     Ext     Ext     Ext    
50/60 Hz Rejection
Oscillator    
50/60 Hz Rejection
Oscillator    
50/60 Hz Rejection
Oscillator    
50/60 Hz Rejection
Oscillator
PGA    
50/60 Hz Rejection
Oscillator
PGA    
50/60 Hz Rejection
Oscillator
PGA    
0.0195     0.041     0.041     0.039     2.5     2.5    
0     0     0     0     0     0    
3     2.7     3     2.7     2.7     2.7    
5.3     5.3     5.3     5.3     5.3     5.3    
3     2.7     3     2.7     2.7     2.7    
5.3     5.3     5.3     5.3     5.3     5.3    
Catalog     Catalog     Catalog