18-Bit Analog-to-Digital Converter for Bridge Sensors - ADS1131

ADS1131 (ACTIVE)

18-Bit Analog-to-Digital Converter for Bridge Sensors

 

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.

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

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

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Interface
Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
Reference Mode
ADS1131 ADS1130 ADS1230 ADS1231 ADS1232 ADS1234
18    18    20    24    24    24   
80    80    80    80    80    80   
1    1    1    1    2    4   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
2.9    2.9    2.9    5    4.3    4.3   
0    0    0    0    0    0   
0.041    0.041    0.039    0.0195    2.5    2.5   
SPI    SPI    SPI    SPI    SPI    SPI   
50/60 Hz Rejection
Oscillator   
50/60 Hz Rejection
Oscillator   
50/60 Hz Rejection
Oscillator
PGA   
50/60 Hz Rejection
Oscillator   
50/60 Hz Rejection
Oscillator
PGA   
50/60 Hz Rejection
Oscillator
PGA   
3    2.7    2.7    3    2.7    2.7   
5.3    5.3    5.3    5.3    5.3    5.3   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 105    -40 to 105   
16SOIC    16TSSOP    16TSSOP    16SOIC    24TSSOP    28TSSOP   
Ext    Ext    Ext    Ext    Ext    Ext   

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