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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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 11
1ku List Price Starting From $5.70
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
Part Models 11
1ku List Price Starting From $5.70

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Documentation

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AD7124-4BRUZ
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Product Lifecycle

PCN

Feb 22, 2023

- 21_0248

AD7124-8/-4 B Grade Redesign - Metal Edit

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Jul 11, 2022

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AD7124-4/AD7124-8 standard grade Redesign - Metal Edit. Applies to LFCSP packages only

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Jun 23, 2016

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May 17, 2023

- 22_0234

AD7124-4 Metal Edit and Assembly Site Change. Applies to TSSOP package only

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May 13, 2024

- 24_0049

Obsolescence of AD7124-4TRUZ-EP and AD7124-4TRUZ-EP-R7

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Feb 22, 2023

- 21_0248

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AD7124-8/-4 B Grade Redesign - Metal Edit

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AD7124-4BBCPZ-RL

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AD7124-4BBCPZ-RL7

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Jul 11, 2022

- 22_0096

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AD7124-4/AD7124-8 standard grade Redesign - Metal Edit. Applies to LFCSP packages only

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Jun 23, 2016

- 16_0118

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AD7124-4 and AD7124-8 Metal Edit and Specification Changes

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May 17, 2023

- 22_0234

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AD7124-4 Metal Edit and Assembly Site Change. Applies to TSSOP package only

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AD7124-4BRUZ-RL

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AD7124-4BRUZ-RL7

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May 13, 2024

- 24_0049

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Obsolescence of AD7124-4TRUZ-EP and AD7124-4TRUZ-EP-R7

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AD7124-4TRUZ-EP-R7

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Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 1

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EVAL-AD7124-4

AD7124-4 Evaluation Board

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EVAL-AD7124-4

AD7124-4 Evaluation Board

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 

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). 

Tools & Simulations

Tools & Simulations 4

Reference Designs

Reference Designs 6

CN0508 Block Diagram

75 Watt, Single-Output Benchtop Power Supply

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cn0508

75 Watt, Single-Output Benchtop Power Supply

cn0508

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
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Design & Integration Tools

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4.72 M

Thermistor Measurement Block Diagram

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

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)
View Detailed Reference Design external link

Design & Integration Tools

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450.91 K

PLC/DCS Channel-to-Channel Isolated Temperature Input

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

CN0376

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

Design & Integration Tools

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4.76 M

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

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

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
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Design & Integration Tools

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450.91 K

AD7124-4/AD7124-8 Thermocouple Measurement Configuration

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

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
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Design & Integration Tools

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450.91 K

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

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

CN0382

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
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Design & Integration Tools

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1.33 M

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