Product details

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TSSOP (PW) 20 42 mm² 6.5 x 6.4
  • 240SPS Data Rate with 4MHz Clock
  • 20-Bit Effective Resolution
  • Input Multiplexer with Four Differential Channels
  • Pin-Selectable, High-Impedance Input Buffer
  • ±5V Differential Input Range
  • 0.0003% INL (typ), 0.0015% INL (max)
  • Self-Calibrating
  • Simple 2-Wire Serial Interface
  • On-Chip Temperature Sensor
  • Single Conversions with Standby Mode
  • Low Current Consumption: 300µA
  • Analog Supply: 2.7V to 5.5V
  • Digital Supply: 2.7V to 5.5V
  • Applications
    • Hand-Held Instrumentation
    • Portable Medical Equipment
    • Industrial Process Control
    • Weigh Scales

All trademarks are the property of their respective owners.

  • 240SPS Data Rate with 4MHz Clock
  • 20-Bit Effective Resolution
  • Input Multiplexer with Four Differential Channels
  • Pin-Selectable, High-Impedance Input Buffer
  • ±5V Differential Input Range
  • 0.0003% INL (typ), 0.0015% INL (max)
  • Self-Calibrating
  • Simple 2-Wire Serial Interface
  • On-Chip Temperature Sensor
  • Single Conversions with Standby Mode
  • Low Current Consumption: 300µA
  • Analog Supply: 2.7V to 5.5V
  • Digital Supply: 2.7V to 5.5V
  • Applications
    • Hand-Held Instrumentation
    • Portable Medical Equipment
    • Industrial Process Control
    • Weigh Scales

All trademarks are the property of their respective owners.

The ADS1224 is a 4-channel, 24-bit, delta-sigma analog- to-digital (A/D) converter. It offers excellent performance and low power in a TSSOP-20 package. The ADS1224 is well-suited for demanding, high-resolution measurements, especially in portable systems and other space-saving and power-constrained applications.

A delta-sigma (ΔΣ) modulator and digital filter form the basis of the A/D converter. The analog modulator has a ±5V differential input range. An input multiplexer (MUX) is used to select between four separate differential input channels. A buffer can be selected to increase the input impedance of the measurement.

A simple, 2-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Standby mode are handled with a few simple waveforms. When only single conversions are needed, the ADS1224 can be quickly shut down (Standby mode) while idle between measurements to dramatically reduce the overall power consumption. Multiple ADS1224s can be connected together to create a synchronously sampling multichannel measurement system. The ADS1224 is designed to easily connect to microcontrollers, such as the MSP430.

The ADS1224 supports 2.7V to 5.5V analog supplies and 2.7V to 5.5V digital supplies. Power is typically less than 1mW in 3V operation and less than 1µW during Standby mode.

The ADS1224 is a 4-channel, 24-bit, delta-sigma analog- to-digital (A/D) converter. It offers excellent performance and low power in a TSSOP-20 package. The ADS1224 is well-suited for demanding, high-resolution measurements, especially in portable systems and other space-saving and power-constrained applications.

A delta-sigma (ΔΣ) modulator and digital filter form the basis of the A/D converter. The analog modulator has a ±5V differential input range. An input multiplexer (MUX) is used to select between four separate differential input channels. A buffer can be selected to increase the input impedance of the measurement.

A simple, 2-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Standby mode are handled with a few simple waveforms. When only single conversions are needed, the ADS1224 can be quickly shut down (Standby mode) while idle between measurements to dramatically reduce the overall power consumption. Multiple ADS1224s can be connected together to create a synchronously sampling multichannel measurement system. The ADS1224 is designed to easily connect to microcontrollers, such as the MSP430.

The ADS1224 supports 2.7V to 5.5V analog supplies and 2.7V to 5.5V digital supplies. Power is typically less than 1mW in 3V operation and less than 1µW during Standby mode.

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Technical documentation

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Type Title Date
* Data sheet 24-Bit Analog-to-Digital Converter with 4-Channel Differential Input Muliplexer datasheet (Rev. C) 10 Dec 2008
Application note Digital Filter Types in Delta-Sigma ADCs 27 Jun 2017
E-book Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs 19 Mar 2015

Design & development

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Simulation model

ADS1224 IBIS Model

SBAM117.ZIP (30 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
Calculation tool

ADC-INPUT-CALC — Analog-to-digital converter (ADC) input driver design tool supporting multiple input types

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

ANALOG-ENGINEER-CALC — Analog engineer's calculator

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 (...)
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