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AD7191:  Pin-Programmable, Ultralow Noise, 24-Bit, Sigma-Delta ADC for Bridge Sensors

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

FEATURES and BENEFITS

  • Pin-programmable output rate
  • Output data rate: 10 Hz, 50 Hz, 60 Hz, 120 Hz
  • Pin-programmable PGA
  • Gain: 1, 8, 64, 128
  • Pin-programmable power-down and reset
  • RMS noise: 15 nV @ 10 Hz (gain = 128)
  • Up to 21.5 noise free bits (gain = 1)
  • Please see data sheet for additional features

AD7191 Functional Block Diagram

Learn how the ADC Active Functional Model is used to evaluate and debug the AD719x

Documentation

Title Content Type File Type
AD7191: Pin-Programmable, Ultralow Noise, 24-Bit, Sigma-Delta ADC for Bridge Sensors Data Sheet (Rev A, 05/2009) (pdf, 434 kB) Data Sheets PDF
CN-0118: Precision Weigh Scale Design Using the AD7191 24-Bit Sigma-Delta ADC with Internal PGA  (pdf, 214 kB) Circuit Note PDF
Tutorial on Technical and Performance Benefits of AD719x Family  (pdf, 4889 kB) Tutorials PDF
UG-280: Evaluation Board for the AD7191 Pin-Programmable, 24-Bit Σ-Δ ADC  (pdf, 1346 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
High-resolution ADCs — an overview
The dramatic reduction in the cost of high-resolution ADCs brings a number of benefits to designers.
(Electronic Products, 4/23/2010)
Technical Articles HTML
FAQs for the AD719x family. FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Companion Products

Suggested Companion Products


Recommended Precision References for the AD7191

  • For low noise and low power applications, we recommend the ADR421.
  • For high current output applications, try the ADR431.
Recommended Precision Driver Amplifiers for the AD7191
  • For low noise and low power applications, we recommend the ADA4051-2.
  • For more precision and great temperature dirft specs, we recommend the AD8539.
  • For higher supply voltages up to +-8V, we recommend the AD8639.
Recommended Digital Isolators for the AD7191
  • For isolated data and power, we recommend the ADuM3470 family in various channel configurations.
Recommended Linear Regulators for the AD7191
  • For powering the separate AVdd and DVdd supplies, we recommend the ADP3303.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7191 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7191BRUZ Status: Production 24 ld TSSOP 24 Ind Tube, 62 $4.50 $3.80 Y  Material Info PCN Purchase Sample
AD7191BRUZ-REEL Status: Production 24 ld TSSOP 24 Ind Reel, 2500 - $3.80 Y  Material Info PCN Purchase
Price Table Help

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.

AD7191 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7191EBZ Status: Production Evaluation Board $59.00 Yes -

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.

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