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AD7124-4-DSCC: Military Data Sheet10/28/2019PDF360 K
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AD7124-4-EP: Enhanced Data Sheet (Rev. 0)4/30/2019PDF240 K
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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)5/1/2015PDF5 M
AD7124-4
4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
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Overview
Features and Benefits
- 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
Product Details
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
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
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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 (Rev. 0)7/13/2017PDF261 K
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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)7/10/2017PDF124 K
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AN-1392: How to Calculate Offset Errors and Input Impedance in ADC Converters with Chopped Amplifiers (Rev. 0)2/26/2016PDF99 K
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AD7124-4 and AD7124-8 Frequently Asked Questions (FAQs)10/20/2020PDF162K
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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)9/29/2015PDF406 K
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CN-0376: Channel-to-Channel Isolated Temperature Input (Thermocouple/RTD) for PLC/DCS Applications8/3/2015PDF298 K
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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 (Rev. D)7/31/2015PDF1 M
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CN-0384: Completely Integrated Thermocouple Measurement System using a Low Power, Precision, 24-Bit, Sigma-Delta ADC (Rev. A)7/31/2015PDF402 K
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AD7124-4/AD7124-8 Timing FAQ Using VE Tool3/17/2023 -
Post / Enhanced Filters on AD7124 and AD717x Sigma Delta ADCs12/23/2021 -
Digital Filters Sinc3 V's Sinc4 Differences and Trade Offs11/28/2018 -
AD7124 Overview 4, 8-Channel Sigma-Delta ADC with PGA & Reference10/15/2018 -
AD7124 Diagnostics on 4, 8-Channel Sigma-Delta ADC with PGA10/15/2018 -
AD7124 Quick Overview10/15/2018 -
Precision Sigma Delta Filtering Tutorial10/15/2018 -
Virtual Evaluation (VE) Tutorial10/15/2018
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Redesigning RTD-Based Temperature Sensors for the Smart Factory Age2/23/2023
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How to Realize Power-Saving Analog–Digital Conversion for Highly Accurate Measurements9/1/2022
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How to Design and Certify Functionally Safe Resistance Temperature Detector (RTD) Systems7/21/2022
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A Simple Way to Use Python for Analysis of Noise in Mixed-Mode Signal Chains3/18/2022
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How to Select and Design the Best RTD Temperature Sensing System6/4/2021 Analog Dialogue
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Simple Realization of a Fully Integrated 4-Wire RTD Temperature Measurement System for High Precision Measurement Applications8/1/2019
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Intelligent Field Instruments—The Smart Way to Industry 4.09/1/2018
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Moving Up the Stack Challenges for Measurement Engineering at ADI4/6/2018 Analog Dialogue
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Understanding and Eliminating 1/f Noise5/1/2017 Analog Dialogue
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Understanding and Extending Safety Operation in a Sigma-Delta ADC2/1/2017 Analog Dialogue
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Integrated Capacitive PGAs in ADCs: Redefining Performance8/1/2016 Analog Dialogue
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Analog Front-End Design Considerations for RTD Ratiometric Temperature Measurements3/1/2016 Analog Dialogue
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ADC Requirements for RTC Temperature Measurement Systems8/1/2015
Software & Systems Requirements
Evaluation Software
Mbed Support
WIKI
Learn how to get started with Mbed
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Tools & Simulations
Virtual Eval - BETA
Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.
Design Tools
Reference Designs (6)
Product Recommendations
AD7124-4 Companion Parts
Recommended Digital Isolators
- For SPI Interface: ADUM1441.
Recommended External Precision Reference
- For low noise, high accuracy, 2.5V reference: ADR4525.
Recommended Power Isolators
- For power isolation: ADUM5010.
Design Resources
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.
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
AD7124-4 Discussions
AD7124-4 filtering
7 week(s) ago in Precision ADCs
AD7124-4 single ended measurement related to AVSS in a grounded application?
10 week(s) ago in Precision ADCs
AD7124-4 measurement of three 4 wire RTDs
10 week(s) ago in Precision ADCs
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.