AD7191

Pin-Programmable, Ultralow Noise, 24-Bit, Sigma-Delta ADC for Bridge Sensors
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Product Details

The AD7191 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) ADC. The on-chip low noise gain stage means that signals of small amplitude can be interfaced directly to the ADC. It contains two differential analog inputs. The part also includes a temperature sensor that can be used for temperature compensation.

For ease-of-use, all the features of the AD7191 are controlled by dedicated pins. The on-chip PGA has a gain of 1, 8, 64, or 128, supporting a full-scale differential input of ±5 V, ±625 mV, ±78 mV, or ±39 mV. The output data rate can be programmed to 10 Hz, 50 Hz, 60 Hz, or 120 Hz. Simultaneous 50 Hz and 60 Hz rejection is obtained when the output data rate is set to 10 Hz or 50 Hz; 60 Hz only rejection is obtained when the output data rate is set to 60 Hz. The AD7191 can be operated with the internal clock, or an external clock can be used.

The part operates with a power supply of 3 V to 5.25 V. It consumes a current of 4.35 mA. It is available in a 24-lead TSSOP package.

Applications

  • Weigh scales
  • Strain gauge transducers
  • Pressure measurement
  • Medical and scientific instrumentation

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-AD7191EBZ is a fully featured evaluation Board for the AD7191. The evaluation board can be operated in standalone mode ( either battery-powered or with external power supply) or connected to a PC via a standard USB interface. When operated with a PC, software is provided enabling the user to perform detailed analysis of the ADC's performance.


Reference Designs

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CN0118 Circuit Diagram

Product Recommendations

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AD7191 Companion Parts

Recommended Precision Driver Amplifiers

  • For higher supply voltages up to +-8V , we recommend the AD8639 .
  • For more precision and great temperature dirft specs , we recommend the AD8539 .
  • For low noise and low power applications , we recommend the ADA4051-2 .

Recommended Precision References

  • For high current output applications, try the ADR431. , we recommend the ADR431 .
  • For low noise and low power applications , we recommend the ADR421 .

Recommended Digital Isolators

  • For isolated data and power , we recommend the ADUM3470 .

Recommended Linear Regulators

  • For powering the separate AVdd and DVdd supplies , we recommend the ADP3303 .

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.

AD7191 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Reviews

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Overview

2 Reviews
2 out of 2 (100%) customers recommend this product.
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Most Helpful Review

by Gilsou
Dear Madame, dear Sir, this is a very great product! I am looking for visual basic code in order to control the board from an EXCEL macro. I would like to store the converted values in an excel file, for plotting traces, extracting information, filtering, etc... Would you have such an example code ? I thank you in advance for your answer, best regards Gilles Soulette

Most Recent Review

by AD7176
I had observe an very high noise (6 bit). The gain is 500000. Filter is "ON".

All Reviews

by AD7176, 2 Sep 14
Noise
I had observe an very high noise (6 bit). The gain is 500000. Filter is "ON".
Was this Helpful?Helpful(0)
by Gilsou, 10 Dec 13
UG257 visual basic code example
Dear Madame, dear Sir, this is a very great product! I am looking for visual basic code in order to control the board from an EXCEL macro. I would like to store the converted values in an excel file, for plotting traces, extracting information, filtering, etc... Would you have such an example code ? I thank you in advance for your answer, best regards Gilles Soulette
Was this Helpful?Helpful(0)

Sample & Buy

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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.