AD7124-4
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AD7124-4

4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference

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Part Models 11
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Features
  • Three power modes
  • RMS noise
    • Low power: 24 nV rms at 1.17 SPS, gain = 128 (255 μA typical)
    • Mid power: 20 nV rms at 2.34 SPS, gain = 128 (355 μA typical)
    • Full power: 23 nV rms at 9.4 SPS, gain = 128 (930 μA typical)
  • Up to 22 noise free bits in all power modes (gain = 1)
  • Output data rate
    • Full power: 9.38 SPS to 19,200 SPS
    • Mid power: 2.34 SPS to 4800 SPS
    • Low power: 1.17 SPS to 2400 SPS
  • Rail-to-rail analog inputs for gains > 1
  • Simultaneous 50 Hz/60 Hz rejection at 25 SPS (single cycle settling)
  • Diagnostic functions (which aid safe integrity level (SIL) certification
  • Crosspoint multiplexed analog inputs
    • 4 differential/7 pseudo differential inputs
  • Programmable gain (1 to 128)
  • Band gap reference with 10 ppm/°C drift maximum (70 μA)
  • Matched programmable excitation currents
  • Internal clock oscillator
  • On-chip bias voltage generator
  • Low-side power switch
  • General-purpose outputs
  • Multiple filter options
  • Internal temperature sensor
  • Self and system calibration
  • Sensor burnout detection
  • Automatic channel sequencer
  • Per channel configuration
  • Power supply: 2.7 V to 3.6 V and ±1.8 V
  • Independent interface power supply
  • Power-down current: 5 μA maximum
  • Temperature range: −40°C to +125°C
  • 32-lead LFCSP/24-lead TSSOP
  • 3-wire or 4-wire serial interface
    • SPI, QSPI, MICROWIRE, and DSP compatible
    • Schmitt trigger on SCLK
  • ESD: 4 kV

AD7124-4-EP Supports defense and aerospace applications (AQEC standard)

  • Download AD7124-4-EP Data Sheet (PDF)
  • Full military temperature range: −55°C to +125°C
  • Controlled manufacturing baseline
  • 1 assembly/test site
  • 1 fabrication site
  • Product change notification
  • Qualification data available on request
  • V62/19614
Additional Details
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The AD7124-4 is a low power, low noise, completely integrated analog front end for high precision measurement applications. The device contains a low noise, 24-bit Σ-Δ analog-to-digital converter (ADC), and can be configured to have 4 differential inputs or 7 single-ended or pseudo differential inputs. The onchip low gain stage ensures that signals of small amplitude can be interfaced directly to the ADC.

One of the major advantages of the AD7124-4 is that it gives the user the flexibility to employ one of three integrated power modes. The current consumption, range of output data rates, and rms noise can be tailored with the power mode selected. The device also offers a multitude of filter options, ensuring that the user has the highest degree of flexibility.

The AD7124-4 can achieve simultaneous 50 Hz and 60 Hz rejection when operating at an output data rate of 25 SPS (single cycle settling), with rejection in excess of 80 dB achieved at lower output data rates.

The AD7124-4 establishes the highest degree of signal chain integration. The device contains a precision, low noise, low drift internal band gap reference, and also accepts an external differential reference, which can be internally buffered. Other key integrated features include programmable low drift excitation current sources, burnout currents, and a bias voltage generator, which sets the common-mode voltage of a channel to AVDD/2. The low-side power switch enables the user to power down bridge sensors between conversions, ensuring the absolute minimal power consumption of the system. The device also allows the user the option of operating with either an internal clock or an external clock.

The integrated channel sequencer allows several channels to be enabled simultaneously, and the AD7124-4 sequentially converts on each enabled channel, simplifying communication with the device. As many as 16 channels can be enabled at any time; a channel being defined as an analog input or a diagnostic such as a power supply check or a reference check. This unique feature allows diagnostics to be interleaved with conversions.

The AD7124-4 also supports per channel configuration. The device allows eight configurations or setups. Each configuration consists of gain, filter type, output data rate, buffering, and reference source. The user can assign any of these setups on a channel by channel basis.

The AD7124-4 also has extensive diagnostic functionality integrated as part of its comprehensive feature set. These diagnostics include a cyclic redundancy check (CRC), signal chain checks, and serial interface checks, which lead to a more robust solution. These diagnostics reduce the need for external components to implement diagnostics, resulting in reduced board space needs, reduced design cycle times, and cost savings. The failure modes effects and diagnostic analysis (FMEDA) of a typical application has shown a safe failure fraction (SFF) greater than 90% according to IEC 61508.

The device operates with a single analog power supply from 2.7 V to 3.6 V or a dual 1.8 V power supply. The digital supply has a range of 1.65 V to 3.6 V. It is specified for a temperature range of −40°C to +105°C. The AD7124-4 is housed in a 32-lead LFCSP package or a 24-lead TSSOP package.

Applications

  • Temperature measurement 
  • Pressure measurement 
  • Industrial process control 
  • Instrumentation Smart transmitters
  • Smart transmitters
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Part Models 11
1ku List Price Starting From $5.70
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AD7124-4

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Data Sheet

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UPDATED 05/01/2015
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AD7124-4: 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference Data Sheet (Rev.E)

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UPDATED 05/01/2015
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AD7124-4: 4 チャンネル、低ノイズ、低消費電力、24 ビット、シグマ・ デルタ（Σ-Δ）ADC、PGA およびリファレンス内蔵 データシート (Rev.D)

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UPDATED 04/30/2019
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AD7124-4-EP: Enhanced Data Sheet (Rev.0)

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UPDATED 10/28/2019
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AD7124-4-DSCC: Military Data Sheet

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Application Note

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AN-1392: How to Calculate Offset Errors and Input Impedance in ADC Converters with Chopped Amplifiers (Rev.0) redirect icon

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AN-1392: 如何计算集成斩波放大器的ADC转换器的失调误差和输入阻抗 (Rev.0) redirect icon

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UPDATED 02/26/2016
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AN-1392: チョッパ・アンプを備えた ADC コンバータのオフセット誤差と 入力インピーダンスの計算方法 (Rev.0) redirect icon

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AN-1461: Options and Solutions for a High Speed or Low Power Signal and Power Isolated RS-485 Fieldbus (Rev.0) redirect icon

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AN-1461：信号和电源隔离RS-485现场总线的高速或低功耗解决方案 redirect icon

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AN-1461: 高速または低消費電力の信号／電源絶縁型 RS-485 フィールドバス向けのオプションおよびソリューション redirect icon

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AN-1464: AD7172-2, AD7172-4, AD7173-8, AD7175-2, AD7175-8, AD7176-2, AD7177-2, AD7124-4, and AD7124-8 Calibration redirect icon

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AN-1464：AD7172-2、AD7172-4、AD7173-8、AD7175-2、AD7175-8、AD7176-2、AD7177-2、AD7124-4和AD7124-8校准 redirect icon

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AN-1464: AD7172-2、AD7172-4、AD7173-8、AD7175-2、AD7175-8、AD7176-2、AD7177-2、AD7124-4、AD7124-8 の補正 redirect icon

Frequently Asked Question

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AD7124-4 and AD7124-8 Frequently Asked Questions (FAQs) redirect icon

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User Guide

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UG-855: Evaluation Board for the AD7124-4 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with In-Amp and Reference redirect icon

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Technical Articles

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UPDATED 02/23/2023
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Redesigning RTD-Based Temperature Sensors for the Smart Factory Age redirect icon

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重新设计基于RTD的温度传感器，以适应智能工厂时代 redirect icon

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スマート・ファクトリ向けに、RTDベースの温度センサー・システムを再構築する redirect icon

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ADC Requirements for RTC Temperature Measurement Systems redirect icon

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RTD温度测量系统对ADC的要求 redirect icon

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Intelligent Field Instruments—The Smart Way to Industry 4.0 redirect icon

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智能现场仪器仪表—迈向工业4.0的智能之路 redirect icon

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インテリジェントなフィールド計測器――インダストリ4.0を見据えたスマートな設計 redirect icon

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Simple Realization of a Fully Integrated 4-Wire RTD Temperature Measurement System for High Precision Measurement Applications redirect icon

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适合高精度测量应用的完全集成式4线RTD温度测量系统的简单实现 redirect icon

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4線式RTDに対応する集積型の温度計測システム、高精度の計測用途に最適 redirect icon

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A Simple Way to Use Python for Analysis of Noise in Mixed-Mode Signal Chains redirect icon

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一种使用Python来分析混合模式信号链中的噪声的简单方法 redirect icon

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ミックスドモード・シグナル・チェーンのノイズ解析にPythonを使用する簡単な方法 redirect icon

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UPDATED 09/01/2022
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How to Realize Power-Saving Analog–Digital Conversion for Highly Accurate Measurements redirect icon

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如何实现高精度测量的节能模数转换 redirect icon

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UPDATED 09/01/2022
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ADCを利用する高精度の計測を低消費電力で実現する方法 redirect icon

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UPDATED 07/21/2022
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How to Design and Certify Functionally Safe Resistance Temperature Detector (RTD) Systems redirect icon

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UPDATED 07/21/2022
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如何设计和认证功能安全电阻温度检测器(RTD)系统 redirect icon

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UPDATED 07/21/2022
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機能的に安全な測温抵抗体（RTD）システムの設計および認証方法 redirect icon

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Documentation

Technical Documents 15
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Data Sheet 3

AD7124-4: 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference Data Sheet (Rev.E)
AD7124-4-EP: Enhanced Data Sheet (Rev.0)
AD7124-4-DSCC: Military Data Sheet

User Guide 1

UG-855: Evaluation Board for the AD7124-4 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with In-Amp and Reference

Application Note 3

AN-1392: How to Calculate Offset Errors and Input Impedance in ADC Converters with Chopped Amplifiers (Rev.0)
AN-1461: Options and Solutions for a High Speed or Low Power Signal and Power Isolated RS-485 Fieldbus (Rev.0)
AN-1464: AD7172-2, AD7172-4, AD7173-8, AD7175-2, AD7175-8, AD7176-2, AD7177-2, AD7124-4, and AD7124-8 Calibration

Technical Articles 7

Redesigning RTD-Based Temperature Sensors for the Smart Factory Age
ADC Requirements for RTC Temperature Measurement Systems
Intelligent Field Instruments—The Smart Way to Industry 4.0
Simple Realization of a Fully Integrated 4-Wire RTD Temperature Measurement System for High Precision Measurement Applications
A Simple Way to Use Python for Analysis of Noise in Mixed-Mode Signal Chains
How to Realize Power-Saving Analog–Digital Conversion for Highly Accurate Measurements
How to Design and Certify Functionally Safe Resistance Temperature Detector (RTD) Systems

Frequently Asked Question 1

AD7124-4 and AD7124-8 Frequently Asked Questions (FAQs)

Circuit Note 4

CN-0382: Isolated 4 mA to 20 mA/HART Temperature and Pressure Industrial Transmitter Using a Low Power, Precision, 24-Bit, Sigma-Delta ADC (Rev.A)
CN0383: Completely Integrated 2-Wire, 3-Wire, or 4-Wire RTD Measurement System Using a Low Power, Precision, 24-Bit Σ-Δ ADC (Rev.D)
CN-0384: Completely Integrated Thermocouple Measurement System using a Low Power, Precision, 24-Bit, Sigma-Delta ADC (Rev.A)
CN-0376: Channel-to-Channel Isolated Temperature Input (Thermocouple/RTD) for PLC/DCS Applications

Device Drivers 2

AD7124 IIO Sigma-Delta ADC GitHub Linux Driver Source Code
AD7124 GitHub no-OS Driver Source Code

Analog Dialogue 6

Analog Front-End Design Considerations for RTD Ratiometric Temperature Measurements
Moving Up the Stack Challenges for Measurement Engineering at ADI
Understanding and Eliminating 1/f Noise
Understanding and Extending Safety Operation in a Sigma-Delta ADC
How to Select and Design the Best RTD Temperature Sensing System
Integrated Capacitive PGAs in ADCs: Redefining Performance

Rarely Asked Question Page 1

Overvoltage Protection for RTD-Based Measurement Systems

Student Zone Article page 1

Virtual Evaluation—Start Your ADC Design Virtually

Webcast 4

Analog to Digital Converter Basics - a Journey to reach precision in your system
The Road to an All EV Future: Enabling Test & Measurement Solutions for Electric Vehicles
Precision in Harsh Industrial Environments
Design Considerations for IO-Link Industrial Smart Factory Sensors & Actuator

Video

8

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2023-03-03

05:42

AD7124-4/AD7124-8 Timing FAQ Using VE Tool

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2016-11-16

03:35

Virtual Evaluation (VE) Tutorial

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2016-11-14

21:33

AD7124 Diagnostics on 4, 8-Channel Sigma-Delta ADC with PGA

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2016-11-11

23:38

AD7124 Overview 4, 8-Channel Sigma-Delta ADC with PGA & Reference

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2017-02-24

23:28

Precision Sigma Delta Filtering Tutorial

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2017-05-30

03:13

Post / Enhanced Filters on AD7124 and AD717x Sigma Delta ADCs

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2017-05-01

05:14

Digital Filters Sinc3 V's Sinc4 Differences and Trade Offs

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2017-03-06

02:55

AD7124 Quick Overview

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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AD7124-4BRUZ-RL7 24-Lead TSSOP external-link
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AD7124-4TRUZ-EP 24-Lead TSSOP external-link
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AD7124-4TRUZ-EP-R7 24-Lead TSSOP external-link
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Software & Part Ecosystem

Mbed Support

AD7124 Temperature Measurement Demo Code
EVAL-AD7124 Temperature Measurement

Mbed is an open source, development environment for ARM microcontrollers.

More Mbed supported ADI Products
Learn how to get started with Mbed
AD7124 MBED Support
EVAL-AD7124 Code

Code Examples

Temperature-BLE Demo on ADuCM3029 Processors
Example on STM32 Processors

Device Drivers

AD7124 IIO Sigma-Delta ADC GitHub Linux Driver Source Code
AD7124 GitHub no-OS Driver Source Code

Looking for Evaluation Software? You can find it here

Parts Product Life Cycle Description

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Evaluation Kits 1

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EVAL-AD7124-4

AD7124-4 Evaluation Board

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AD7124-4 Evaluation Board

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EVAL-AD7124-4
AD7124-4 Evaluation Board

Features and Benefits

  • Full featured evaluation board for the AD7124-4 
  • PC control in conjunction with the system demonstration platform (EVAL-SDP-CB1Z) 
  • PC software for control and data analysis (time domain) 
  • Standalone capability 

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Product Detail

The EVAL-AD7124-4SDZ evaluation kit features the AD7124-4 24-bit, low power, low noise analog-to-digital converter (ADC). A 7 V to 9 V external supply is regulated to 3.3 V to supply the AD7124-4 and support all necessary components. The EVAL-AD7124-4SDZ board connects to the USB port of the PC by connection to the EVAL-SDP-CB1Z motherboard.  

The EVAL-AD7124-4SDZ software fully configures the AD7124-4 device register functionality and provides dc time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation. 

The EVAL-AD7124-4SDZ is an evaluation board that is designed to allow the user to evaluate the features of the ADC. The user PC software executable controls the AD7124-4 over the USB through the system demonstration platform board (EVAL-SDP-CB1Z). 

Resources

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UG-855: Evaluation Board for the AD7124-4 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with In-Amp and Reference Download

1.8 M

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Software

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AD7124-4/AD7124-8 Eval+ Software Download

255.56 M

Evaluation Kits1

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EVAL-AD7124-4

AD7124-4 Evaluation Board

Tools & Simulations 4

Reference Designs 6

Thermistor Measurement Block Diagram

CN0545

Completely Integrated, 0.1°C Thermistor Measurement System Using a Low Power, Precision, 24-Bit Sigma-Delta ADC

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CN0545

Completely Integrated, 0.1°C Thermistor Measurement System Using a Low Power, Precision, 24-Bit Sigma-Delta ADC

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CN0545

Circuits from the lab

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Completely Integrated, 0.1°C Thermistor Measurement System Using a Low Power, Precision, 24-Bit Sigma-Delta ADC

Features and Benefits

  • 0.1 Degree Accurate Thermistor Measurement System
  • Highly Integrated Solution
  • Up to 4 Thermistors (AD7124-4) or 8 Thermistors(AD7124-8)
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Part Used 3

AD7124-4 reference design link

AD7124-8 reference design link

ADP150 reference design link

Design & Integration Tools

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CN0381 / CN0383 / CN0384 Design and Integration Files link icon

450.91 K

CN0508 Block Diagram

CN0508

75 Watt, Single-Output Benchtop Power Supply

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CN0508

75 Watt, Single-Output Benchtop Power Supply

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Circuits from the lab

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75 Watt, Single-Output Benchtop Power Supply

Features and Benefits

  • 75 Watt Power Supply
  • Constant Current (>3A) and Constant Voltage (>25V) Modes
  • True 0V and 0A operation
  • Manual or Software Controlled
View Detailed Reference Design external link

Part Used 8

LT3081 reference design link

LT8612 reference design link

LTC1983 reference design link

AD5683R reference design link

LT6015 reference design link

ADCMP392 reference design link

AD7124-4 reference design link

LT8609
LT8609A
LT8609B reference design link

Design & Integration Tools

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4.72 M

2-Wire, 3-Wire, or 4-Wire RTD Measurement Configuration

CN0383

Completely Integrated 2-Wire, 3-Wire, or 4-Wire RTD Measurement System Using a Low Power, Precision, 24-Bit Σ-Δ ADC

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CN0383

Completely Integrated 2-Wire, 3-Wire, or 4-Wire RTD Measurement System Using a Low Power, Precision, 24-Bit Σ-Δ ADC

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CN0383

Circuits from the lab

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Completely Integrated 2-Wire, 3-Wire, or 4-Wire RTD Measurement System Using a Low Power, Precision, 24-Bit Σ-Δ ADC

Features and Benefits

  • Highly Integrated 2-, 3-, and 4-Wire RTD Measurement System
  • 24-bit Resolution
  • Accuracy: <1°C
  • Low Power
  • Accuracy: <1°C over temperature
View Detailed Reference Design external link

Part Used 3

AD7124-4 reference design link

AD7124-8 reference design link

ADP1720 reference design link

Design & Integration Tools

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CN0381 / CN0383 / CN0384 Design and Integration Files link icon

450.91 K

AD7124-4/AD7124-8 Thermocouple Measurement Configuration

CN0384

Completely Integrated Thermocouple Measurement System using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

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CN0384

Completely Integrated Thermocouple Measurement System using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

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CN0384

Circuits from the lab

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Completely Integrated Thermocouple Measurement System using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

Features and Benefits

  • Highly Integrated Thermocouple Measurement System
  • 24-bit Resolution
  • Accuracy: <1°C
  • Low Power
  • Accuracy: <1°C over temperature
View Detailed Reference Design external link

Part Used 3

AD7124-4 reference design link

AD7124-8 reference design link

ADP1720 reference design link

Design & Integration Tools

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CN0381 / CN0383 / CN0384 Design and Integration Files link icon

450.91 K

4 mA to 20 mA, Loop Powered Field Instrument with HART Interface

CN0382

Isolated 4 mA to 20 mA/HART Temperature and Pressure Industrial Transmitter Using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

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CN0382

Isolated 4 mA to 20 mA/HART Temperature and Pressure Industrial Transmitter Using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

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Circuits from the lab

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Isolated 4 mA to 20 mA/HART Temperature and Pressure Industrial Transmitter Using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

Features and Benefits

  • Isolated 4-20mA Field Instrument
  • HART Transmitter
  • Loop Powered
  • Temperature and Pressure Inputs
View Detailed Reference Design external link

Part Used 6

AD7124-4 reference design link

AD5421 reference design link

AD5700 reference design link

ADUM1441 reference design link

ADP162 reference design link

ADG5433 reference design link

Design & Integration Tools

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CN0382 Design & Integration Files link icon

1.33 M

PLC/DCS Channel-to-Channel Isolated Temperature Input

CN0376

Channel-to-Channel Isolated Temperature Input (Thermocouple/RTD) for PLC/DCS Applications

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CN0376

Channel-to-Channel Isolated Temperature Input (Thermocouple/RTD) for PLC/DCS Applications

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Circuits from the lab

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Channel-to-Channel Isolated Temperature Input (Thermocouple/RTD) for PLC/DCS Applications

Features and Benefits

  • Highly Integrated Two-Channel Isolated PLC/DCS Input
  • Thermocouple/RTD Inputs
  • Signal and Power Isolation
  • Low Power, Small Size
View Detailed Reference Design external link

Part Used 5

AD7124-4 reference design link

AD7124-8 reference design link

ADUM5010 reference design link

ADUM1441 reference design link

ADP2441 reference design link

Design & Integration Tools

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CN0376 Design and Integration Files link icon

4.76 M

Reference Designs6

Thermistor Measurement Block Diagram

CN0545

Completely Integrated, 0.1°C Thermistor Measurement System Using a Low Power, Precision, 24-Bit Sigma-Delta ADC

CN0508 Block Diagram

CN0508

75 Watt, Single-Output Benchtop Power Supply

2-Wire, 3-Wire, or 4-Wire RTD Measurement Configuration

CN0383

Completely Integrated 2-Wire, 3-Wire, or 4-Wire RTD Measurement System Using a Low Power, Precision, 24-Bit Σ-Δ ADC

AD7124-4/AD7124-8 Thermocouple Measurement Configuration

CN0384

Completely Integrated Thermocouple Measurement System using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

4 mA to 20 mA, Loop Powered Field Instrument with HART Interface

CN0382

Isolated 4 mA to 20 mA/HART Temperature and Pressure Industrial Transmitter Using a Low Power, Precision, 24-Bit, Sigma-Delta ADC

PLC/DCS Channel-to-Channel Isolated Temperature Input

CN0376

Channel-to-Channel Isolated Temperature Input (Thermocouple/RTD) for PLC/DCS Applications

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