AD7124-8
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AD7124-8

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

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Part Details
Part Models 7
1ku List Price Starting From $6.33
Features
  • 3 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
    • 8 differential/15 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
  • 3-wire or 4-wire serial interface
    • SPI, QSPI, MICROWIRE, and DSP compatible
    • Schmitt trigger on SCLK
  • ESD: 4 kV
  • AEC-Q100 qualified for automotive applications
Additional Details
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The AD7124-8 is a low power, low noise, completely integrated analog front end for high precision measurement applications. The AD7124-8 W grade is AEC-Q100 qualified for automotive applications. The device contains a low noise, 24-bit Σ-Δ analog-to-digital converter (ADC), and can be configured to have 8 differential inputs or 15 single-ended or pseudo differential inputs. The on-chip low gain stage ensures that signals of small amplitude can be interfaced directly to the ADC.

One of the major advantages of the AD7124-8 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 AD7124-8 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 AD7124-8 establishes the highest degree of signal chain integration. The device contains a precision, low noise, low drift internal band gap reference and 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 AD7124-8 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 AD7124-8 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 AD7124-8 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 +125°C. The AD7124-8 is housed in a 32-lead LFCSP package.

APPLICATIONS

  • Temperature measurement
  • Pressure measurement
  • Industrial process control
  • Instrumentation
  • Smart transmitters
Part Models 7
1ku List Price Starting From $6.33

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Documentation

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Product Lifecycle

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

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PCN

Feb 22, 2023

- 21_0248

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

AD7124-8BBCPZ

PRODUCTION

AD7124-8BBCPZ-RL

PRODUCTION

AD7124-8BBCPZ-RL7

PRODUCTION

Jul 11, 2022

- 22_0096

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

AD7124-8BCPZ

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AD7124-8BCPZ-RL

PRODUCTION

AD7124-8BCPZ-RL7

PRODUCTION

Jun 23, 2016

- 16_0118

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

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Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 2

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EVAL-AD7124-8

AD7124-8 Evaluation Board

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EVAL-AD7124-8

AD7124-8 Evaluation Board

AD7124-8 Evaluation Board

Features and Benefits

  • Full featured evaluation board for the AD7124-8
  • 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-AD7124-8SDZ evaluation kit features the AD7124-8 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 AD7124-8 and support all necessary components. The EVAL-AD7124-8SDZ board connects to the USB port of the PC by connection to the EVAL-SDP-CB1Z motherboard.


The EVAL-AD7124-8SDZ software fully configures the AD7124-8 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-AD7124-8SDZ 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 AD7124-8 over the USB through the system demonstration platform board (EVAL-SDP-CB1Z).

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EVAL-AD7124-8-PMDZ

8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference PMOD Board

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EVAL-AD7124-8-PMDZ

8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference PMOD Board

8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference PMOD Board

Features and Benefits

  • 24-Bit Sigma-Delta ADC
  • Low Noise, Low Power
  • Connectable to FPGA and MCU Platforms

Product Detail

The PMOD compatible evaluation/prototyping board is a small form factor, low cost, low noise, 24-Bit, Sigma-Delta ADC board. When prototyping, this board is used in conjunction with the ADICUP3029 or any other PMOD compatible development platform. Direct electrical and physical connection will enable you to get started quickly with hardware and software, to help develop your solution.

SPI PMOD peripheral connectors can also be found on many 3rd party MCU or FPGA development boards, where the EVAL-AD7124-8-PMDZ can be connected directly into those systems, and you can develop your own code using our reference code below.

Tools & Simulations

Tools & Simulations 4

Reference Designs

Reference Designs 8

Figure 1. CN0554 Simplified Block Diagram

±10 V Analog Input and ±15 V Analog Output for Raspberry Pi Platforms

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CN0554

±10 V Analog Input and ±15 V Analog Output for Raspberry Pi Platforms

CN0554

Circuits from the lab

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±10 V Analog Input and ±15 V Analog Output for Raspberry Pi Platforms

Features and Benefits

  • 8-Psuedo differential inputs or 16-Single-ended inputs
  • Selectable Input Voltage range, up to ±13 V
  • 16 Single-ended Outputs
  • Up to ±15 V Outputs
  • All Power Rails Derived from the Raspberry Pi
View Detailed Reference Design external link

Design & Integration Tools

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3.71 M

Videos

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Feb 17, 2023

01:00

CN0554: 10V Analog Input and 15V Analog Output for Raspberry Pi

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

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
View Detailed Reference Design external link

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
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
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Design & Integration Tools

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4.76 M

Simplified Circuit Block Diagram

Soil Moisture and pH Measurement System with Temperature Compensation

Thermocouple Measurement System

Flexible, Low Power, 4-Channel Thermocouple System with Arduino-Compatible Digital Interface

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CN0391

Flexible, Low Power, 4-Channel Thermocouple System with Arduino-Compatible Digital Interface

CN0391

Circuits from the lab

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Flexible, Low Power, 4-Channel Thermocouple System with Arduino-Compatible Digital Interface

Features and Benefits

  • Flexible 4-channel thermocouple system 
  • Cold junction compensation 
  • 24-bit digitization 
  • Low power 
  • Arduino-compatible form factor 
View Detailed Reference Design external link

Design & Integration Tools

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675.45 K

EVAL-CN0411-ARDZ Evaluation Board

TDS Measurement System for Water Quality Monitoring 

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CN0411

TDS Measurement System for Water Quality Monitoring 

CN0411

Circuits from the lab

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TDS Measurement System for Water Quality Monitoring 

Features and Benefits

  • Measures TDS using Electrical Conductivity
  • Measurement range from 1uS to 1S
  • Uses Standard BNC Probe Connection
  • Arduino Form Factor Compatible
View Detailed Reference Design external link

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