AD7793

3-Channel, Low Noise, Low Power, 24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
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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 Lifecycle

checked 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

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Product Details

The EVAL-AD7793EBZ is a fully featured evaluation Board for the AD7793. The evaluation board can be connected to a PC via a standard USB interface. Software is provided enabling the user to perform detailed analysis of the ADC's performance.

Documentation

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Tools & Simulations

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Design Tools

Reference Designs

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CN0206 Circuit Diagram

CN0206 Photo

CN0172 Circuit Diagram

CN0172 Photo

CN0066 Circuit Diagram

CN0067 Circuit Diagram

Product Recommendations

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AD7793 Companion Parts

Recommended Digital Isolators

Recommended High Accuracy, Precision References - 2.5V

  • For applications requiring the lowest noise performance and output trim adjust , we recommend the ADR441 .
  • For high output current applications , we recommend the ADR431 .
  • For wide supply applications , we recommend the AD780 .
  • For cost sensitive applications , we recommend the AD1582 or the ADR391 .

Design Resources

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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.

AD7793 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

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Reviews

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Overview

5 Reviews
4 out of 5 (80%) customers recommend this product.
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Most Helpful Review

by Anonymous
K type thermocouples Temperature Range 0 to 1500 Degree Celcius Linearity : +/- 0.1 Degree Celc. of Full Span Deviation Accuracy : +/- 0.5 Degree Celc. of Full Span Deviation Inbuilt Temp Compensation required . Thermistor is not that much accurate.

Most Recent Review

by Reza
I used it. Nice compacted adc solution, but a sinusual harmonic noise appears in thermocouple measurements at the speeds higher than 16.7Hz. I recommend that you use this device in the low frequencies. not in high speed or medium speed systems.

All Reviews

by Reza, 10 Sep 13
I used it. Nice compacted adc solution, but ...
I used it. Nice compacted adc solution, but a sinusual harmonic noise appears in thermocouple measurements at the speeds higher than 16.7Hz. I recommend that you use this device in the low frequencies. not in high speed or medium speed systems.
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by apoorv, 12 Aug 13
Good performance, Easy to use
I used it with RTD, it gave me pretty good performance and could easily start with it by hooking it to SPI bus.
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by Anonymous, 19 Feb 13
Very versatile A/D converter. Graat internal amplifier
Increase the frequency of conversion and the value of amplification up to 256.
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by Anonymous, 8 Dec 12
This product has many usable features
- low noise - high resolution - low power - programmable current source - PGA - I2C interface
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by Anonymous, 22 Sep 12
practically not possible for Thermocouples K type & 1500 Degree Celc.
K type thermocouples Temperature Range 0 to 1500 Degree Celcius Linearity : +/- 0.1 Degree Celc. of Full Span Deviation Accuracy : +/- 0.5 Degree Celc. of Full Span Deviation Inbuilt Temp Compensation required . Thermistor is not that much accurate.
Was this Helpful?Helpful(1)

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.