24-Bit, Ultra Low-Noise Analog-to-Digital Converter - ADS1232

ADS1232 (ACTIVE)

24-Bit, Ultra Low-Noise Analog-to-Digital Converter

Description

The ADS1232 and ADS1234 are precision 24-bit analog-to-digital converters (ADCs). With an onboard, low-noise programmable gain amplifier (PGA), precision delta-sigma ADC and internal oscillator, the ADS1232/4 provide a complete front-end solution for bridge sensor applications including weigh scales, strain gauges and pressure sensors.

The input multiplexer accepts either two (ADS1232) or four (ADS1234) differential inputs. The ADS1232 also includes an onboard temperature sensor to monitor ambient temperature. The onboard, low-noise PGA has a selectable gain of 1, 2, 64, or 128 supporting a full-scale differential input of ±2.5V, ±1.25V, ±39mV, or ±19.5mV. The delta-sigma ADC has 23.5-bit effective resolution and is comprised of a 3rd-order modulator and 4th-order digital filter. Two data rates are supported: 10SPS (with both 50Hz and 60Hz rejection) and 80SPS. The ADS1232/4 can be clocked externally using an oscillator or a crystal. There is also an internal oscillator available that requires no external components. Offset calibration is performed on-demand and the ADS1232/4 can be put in a low-power standby mode or shut off completely in power-down mode. All of the features of the ADS1232/4 are operated through simple pin-driven control. There are no digital registers to program in order to simplify software development. Data are output over an easily-isolated serial interface that connects directly to the MSP430 and other microcontrollers.

The ADS1232 is available in a TSSOP-24 package and the ADS1234 is in a TSSOP-28. Both are fully specified from -40°C to +105°C.

Features

  • Complete Front-End for Bridge Sensors
  • Up to 23.5 Effective Bits
  • Onboard, Low-Noise PGA
  • RMS Noise:
    17nV at 10SPS (PGA = 128)
    44nV at 80SPS (PGA = 128)
  • 19.2-Bit Noise-Free Resolution at Gain = 64
  • Over 100dB Simultaneous 50Hz and 60Hz Rejection
  • Flexible Clocking:
    Low-Drift Onboard Oscillator (±3%) Optional External Crystal
  • Selectable Gains of 1, 2, 64, and 128
  • Easy Ratiometric Measurements—External Voltage Reference up to 5V
  • Selectable 10SPS or 80SPS Data Rates
  • Two-Channel Differential Input with Built-In Temperature Sensor (ADS1232)
  • Four-Channel Differential Input (ADS1234)
  • Simple Serial Digital Interface
  • Supply Range: 2.7V to 5.3V
  • -40°C to +105°C Temperature Range
  • APPLICATIONS
    • Weigh Scales
    • Strain Gauges
    • Pressure Sensors
    • Industrial Process Control

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

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Multi-Channel Configuration
Input Range (Min)
Input Range (Max)
Interface
Architecture
Integrated Features
INL (Max) (+/-LSB)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
Input Type
Reference Mode
ADS1232 ADS1130 ADS1131 ADS1230 ADS1231 ADS1234
24     18     18     20     24     24    
80SPS     80SPS     80SPS     80SPS     80SPS     80SPS    
2     1     1     1     1     4    
Multiplexed             Multiplexed    
0     0     0     0     0     0    
2.5     0.041     0.041     0.039     0.0195     2.5    
Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
50/60 Hz Rejection
Oscillator
PGA    
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    
168     5.2     5.2     6.29     134.2     168    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 105     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 105    
24TSSOP     16TSSOP     16SOIC     16TSSOP     16SOIC     28TSSOP    
3.90 | 1ku     2.50 | 1ku     2.10 | 1ku     2.95 | 1ku     2.50 | 1ku     4.05 | 1ku    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Ext     Ext     Ext     Ext     Ext     Ext    

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