ADS1232

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24-Bit, 80SPS, 2-Ch (Differential), Pin-Programmable Delta-Sigma ADC for Bridge Sensors

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Product details

Parameters

Resolution (Bits) 24 Number of input channels 2 Sample rate (Max) (kSPS) 0.08 Interface type SPI Architecture Delta-Sigma Input type Differential Multi-channel configuration Multiplexed Rating Catalog Reference mode Ext Input range (Max) (V) 2.5 Input range (Min) (V) 0 Features 50/60 Hz Rejection, Oscillator, PGA Operating temperature range (C) -40 to 105 Power consumption (Typ) (mW) 4.3 Analog voltage AVDD (Min) (V) 2.7 Analog voltage AVDD (Max) (V) 5.3 Digital supply (Min) (V) 2.7 Digital supply (Max) (V) 5.3 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

TSSOP (PW) 24 34 mm² 4.4 x 7.8 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Complete front-end for bridge sensors
  • 23.5-bits effective resolution at gain = 1
  • 19.2-bits noise-free resolution at gain = 64
  • Low-noise PGA
  • Selectable gains of 1, 2, 64, and 128
  • RMS noise:
    • 17 nV at 10 SPS at gain = 128
    • 44 nV at 80 SPS at gain = 128
  • 100-dB simultaneous 50-Hz and 60-Hz rejection
  • Flexible clocking:
    • Low-drift internal oscillator
    • Optional external crystal
  • Selectable 10-SPS or 80-SPS data rates
  • Easy ratiometric measurements:
    • External voltage reference up to 5 V
  • Two-channel differential input with internal temperature sensor (ADS1232)
  • Four-channel differential input (ADS1234)
  • Two-wire serial interface
  • Supply voltage range: 2.7 V to 5.3 V
  • Temperature range: –40°C to +105°C
  • Packages: TSSOP-24 (ADS1232) or TSSOP-28 (ADS1234)

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Description

The ADS1232 and ADS1234 (ADS123x) are precision, 24-bit, analog-to-digital converters (ADCs). With a low-noise programmable gain amplifier (PGA), a precision delta-sigma ADC, and internal oscillator, the ADS123x provide a complete front-end solution for bridge sensor applications including weigh scales, strain gauges, and pressure sensors.

An input multiplexer (MUX) accepts either two (ADS1232) or four (ADS1234) differential inputs. The ADS1232 also includes a temperature sensor to monitor ambient temperature. The low-noise PGA has a selectable gain of 1, 2, 64, or 128, supporting a full-scale differential input of ±2.5 V, ±1.25 V, ±39 mV, or ±19.5 mV.

The delta-sigma ADC provides a maximum of 23.5-bits effective resolution, and supports two data rates: 10 SPS (providing 50-Hz and 60-Hz rejection) and 80 SPS. The ADS123x can be clocked externally using an oscillator or a crystal, or by the internal oscillator.

Offset calibration is performed on-demand, and the ADS123x can be put in a low-power standby mode or shut off completely in power-down mode. The ADS123x are operated through simple pin-driven control—there are no digital registers to program.

Data are output over a two-wire serial interface that connects directly to the MSP430 and other microcontrollers.

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Technical documentation

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Type Title Date
* Data sheet ADS123x 2- and 4-Channel, 24-Bit, Delta-Sigma ADCs for Bridge Sensors datasheet (Rev. G) Jan. 29, 2021
E-book Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application note Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
E-book Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
Application note Delta-Sigma ADC Design for Bridge Sensor Applications Sep. 30, 2011
User guide ADS1232REF User's Guide (Rev. B) Jul. 14, 2011
White paper Complete Front End Solutions for Weigh Scales Jun. 14, 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description

The ADS1232REF is a circuit board that is designed to feature the ADS1232 24-bit delta-sigma, precision low noise, analog-to digital converter. This board contains the entire circuitry and user interface needed for a weigh-scale digitizer. It is suitable for the general evaluation of the ADS1232 (...)

Features
  • USB connection for firmware updates and remote control
  • Power is applied by either a 9V battery or wall plug 9V adapter
  • Connections for load cells and other voltage sources
  • Designed for very low power consumption
  • Eight-digit starburst LCD readout

Design tools & simulation

SIMULATION MODEL Download
SBAM112.ZIP (33 KB) - IBIS Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
CALCULATION TOOL Download
Analog-to-digital converter (ADC) input driver design tool supporting multiple input types
ADC-INPUT-CALC ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and transformer-coupled (...)
CALCULATION TOOL Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 24 View options

Ordering & quality

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  • Ongoing reliability monitoring

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