AD7793
3-Channel, Low Noise, Low Power, 24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
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Alternative Parts
AD7124-4
Lower power and lower noise, completed signal chain integration with diagnostic features for functional safety, easier evaluation and reduced design time
Overview
Features and Benefits
- Up to 23 bits effective resolution
- RMS noise
- 40 nV @ 4.17 Hz
- 85 nV @ 16.7 Hz
- Current: 400 μA typical
- Power-down: 1 μA maximum
- Update rate: 4.17 Hz to 470 Hz
- 3 differential inputs
Product Details
The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain a low noise 16-/24-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 40 nV when the update rate equals 4.17 Hz.
The devices contain a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2
The devices can be operated with either the internal clock or an external clock. The output data rate from the parts is software-programmable and can be varied from 4.17 Hz to 470 Hz.
The parts operate with a power supply from 2.7 V to 5.25 V. They consume a current of 400 μA typical and are housed in a 16-lead TSSOP package.
Applications
- Thermocouple measurements
- RTD measurements
- Thermistor measurements
- Gas analysis
- Industrial process control
- Instrumentation
- Portable instrumentation
- Blood analysis
- Smart transmitters
- Liquid/gas chromatography
- 6-digit DVM
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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AN-1521: Fully Isolated Input Module Based on the AD7793 24-Bit, Σ-Δ ADC and the ADuM5401 Digital Isolator7/18/2018PDF143 K
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AN-1522: Fully Isolated Input Module Based on the AD7793 24-Bit Σ-Δ ADC, the ADuM5401 Digital Isolator, and a High Performance In-Amp (Rev. C)1/29/2018PDF179 K
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AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015PDF76 K
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AN-389: Using Sigma-Delta Converters-Part 22/14/2015PDF590 kB
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AN-388: Using Sigma-Delta Converters-Part 12/14/2015PDF590 kB
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AN-880: ADC Requirements for Temperature Measurement Systems (Rev. 0)2/14/2015PDF423 kB
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AN-347: Shielding and Guarding2/14/2015PDF688 kB
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AN-968: Current Sources: Options and Circuits (Rev. 0)10/22/2008PDF131 kB
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AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008PDF217 kB
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AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006PDF222 kB
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AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004PDF70 kB
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AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation12/12/2002PDF280 kB
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AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002PDF149 kB
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AN-283: Sigma-Delta ADCs and DACs9/24/2002PDF1699 kB
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UG-181: PLC Demo System, Industrial Process Control Demo System (Rev. A)9/21/2010PDF495 K
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FAQs7/26/2017
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CN0326: Isolated Low Power pH Monitor with Temperature Compensation10/29/2013PDF512 kB
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CN-0206: Thermocouple Temperature Measurement System with Less Than 500 μA Current Drain8/26/2013PDF252 kB
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CN-0172: High Accuracy Multichannel Thermocouple Measurement Solution3/22/2013PDF319 kB
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Isolated pH Monitor with Temperature Compensation7/1/2019
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Minimizing Errors in Multiplexed 3-Wire RTD Data-Acquisition Systems9/1/2013 Analog Dialogue
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Two Ways to Measure Temperature Using Thermocouples Feature Simplicity, Accuracy, and Flexibility10/1/2010 Analog Dialogue
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PLC Evaluation Board Simplifies Design of Industrial Process-Control systems4/1/2009 Analog Dialogue
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Precision Signal-Processing and Data-Conversion ICs for PLCs Now Have More Performance at Less Power, Size, and Cost8/1/2006 Analog Dialogue
Software & Systems Requirements
Tools & Simulations
Design Tools
XLS
AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model
280.5 K
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Reference Designs (4)
Product Recommendations
AD7793 Companion Parts
Recommended Digital Isolators
- For digital isolators with integrated isolated power: ADUM5401, ADUM5402, ADUM5403.
- For isolated USB designs in healthcare and industrial control: ADUM4160.
- For process control applications: ADUM1400, ADUM1200.
- For cost sensitive designs: ADUM7440, ADUM7441, ADUM7442.
Recommended High Accuracy, Precision References - 2.5V
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.
PCN-PDN Information
Support & Discussions
AD7793 Discussions
How to calculate the resistance of pt100 using the obtained ad value in reference design CN0206？
6 day(s) ago in Reference Designs
RE: Thermocouple measurement using LTC2368-24 Noise
12 week(s) ago in Precision ADCs
RE: ADRV9002 Kernel Module Support
24 week(s) ago in Linux Software Drivers
Sample & Buy
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Evaluation Boards
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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.