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

All trademarks are the property of their respective owners.

View more

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

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Interface
Integrated Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
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   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
4.3    2.9    2.9    2.9    5    4.3   
0    0    0    0    0    0   
2.5    0.041    0.041    0.039    0.0195    2.5   
SPI        SPI    SPI    SPI   
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   
2.7    2.7    3    2.7    3    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 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    4.25 | 1ku   
Ext    Ext    Ext    Ext    Ext    Ext   

Featured tools and software