ADS1131 (ACTIVE)

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

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

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) (kSPS)
# 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)
INL (Max) (+/-LSB)
Sample Rate (Max) (MSPS)
ADS1131 ADS1130 ADS1230 ADS1231 ADS1232 ADS1234
18    18    20    24    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    TSSOP    TSSOP    SOIC    TSSOP    TSSOP   
2.10 | 1ku    2.50 | 1ku    2.95 | 1ku    2.50 | 1ku    3.90 | 1ku    4.25 | 1ku   
2.9    2.9    2.9    5    4.3    4.3   
16SOIC: 59 mm2: 6 x 9.9(SOIC)    16TSSOP: 32 mm2: 6.4 x 5(TSSOP)    16TSSOP: 32 mm2: 6.4 x 5(TSSOP)    16SOIC: 59 mm2: 6 x 9.9(SOIC)    24TSSOP: 50 mm2: 6.4 x 7.8(TSSOP)    28TSSOP: 62 mm2: 6.4 x 9.7(TSSOP)   
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
Single-Ended   
Differential
Single-Ended   
N/A    N/A    N/A    N/A    Multiplexed    Multiplexed   
Ext    Ext    Ext    Ext    Ext    Ext   
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   
0.041    0.041    0.039    0.0195    2.5    2.5   
0    0    0    0    0    0   
3    2.7    2.7    3    2.7    2.7   
5.3    5.3    5.3    5.3    5.3    5.3   
3    2.7    2.7    3    2.7    2.7   
5.3    5.3    5.3    5.3    5.3    5.3   
5.2    5.2    6.29    134.2    168    168   
0.00008    0.00008    0.00008    0.00008    0.00008    0.00008   

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