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AD7796:  Low Power 16-Bit Sigma-Delta A/D Converter for Bridge Sensors

Product Details


The AD7796 is a complete analog front end for high precision bridge sensor applications such as weighscales. The AD7796 contains a ∑-∆ ADC capable of 16-bit resolution. The on-chip instrumentation amplifier has a fixed gain of 128 so signals of small amplitude such as those from bridge sensors can be interfaced directly to the ADC.

The part has one differential input. The device also contains a temperature sensor which is internally connected to the ADC. This temperature sensor can be used to perform temperature compensation of the bridge.

The device can be operated with the internal clock, or alternatively, an external clock can be used. The output data rate from the parts is software-programmable and can be varied from 4.17 Hz to 123 Hz.

The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 250 µA typical and is housed in a 16-lead TSSOP package.

Applications

  • Weighscales
  • Strain Gauges
  • Industrial Process Control
  • Instrumentation
  • Portable instrumentation

FEATURES and BENEFITS

  • RMS noise: 65 nV
  • Instrumentation amp
  • Temperature sensor
  • Internal clock oscillator
  • Simultaneous 50 Hz/60 Hz rejection
  • Update rate: 4.17 Hz to 123 Hz
  • Current: 250 µA typ
  • Power-down: 1 µA
  • Power supply: 2.7 V to 5.25 V
  • –40°C to +85°C temperature range
  • Independent interface power supply
  • 16-lead TSSOP package

Functional Block Diagram for AD7796

Documentation

Title Content Type File Type
AD7796/AD7797: Low Power 16/24-Bit Σ-Δ ADC for Bridge Sensors Data Sheet (Rev A, 08/2006) (pdf, 554 kB) Data Sheets PDF
AN-968: Current Sources: Options and Circuits  (pdf, 131 kB) Application Notes PDF
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging  (pdf, 217 kB) Application Notes PDF
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC  (pdf, 222 kB) Application Notes PDF
AN-615: Peak-to-Peak Resolution Versus Effective Resolution  (pdf, 70 kB)
This application note describes effective resolution and peak-to-peak resolution and highlights the difference between these two specifications.
Application Notes PDF
AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation  (pdf, 280 kB) Application Notes PDF
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:  (pdf, 149 kB)
The Most Common Causes and the Associated Fixes to Prevent Reoccurrence
Application Notes PDF
AN-347: Shielding and Guarding  (pdf, 688 kB)
How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach
Application Notes PDF
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change  (pdf, 76 kB) Application Notes PDF
AN-389: Using Sigma-Delta Converters-Part 2  (pdf, 590 kB)
When to Use/How to Use Sigma-Delta ADCs; Continuation of Part 1 Discussion.
Application Notes PDF
AN-388: Using Sigma-Delta Converters-Part 1  (pdf, 590 kB)
When to Use/How to Use Sigma-Delta ADCs
Application Notes PDF
AN-283: Sigma-Delta ADCs and DACs  (pdf, 1699 kB)
Overview of Sigma-Delta Concepts: Oversampling, Noise Shaping Using the Sigma-Delta Modulator, Digital Filtering and Decimation.
Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
RAQs index Rarely Asked Questions HTML
FAQs for the AD779x family. FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Utilities and Conversions HTML
Digital Filter Model Spreadsheets
These spreadsheet tools show the response of the digital filter section of the AD71xx and AD77xx devices based on input parameters.
Design Calculators 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.

SampleSample & Buy

Price, packaging, availability

AD7796 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7796BRUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $3.29 $2.78 Y  Material Info PCN Purchase Sample
AD7796BRUZ-REEL Status: Production 16 ld TSSOP 16 Ind Reel, 2500 - $2.78 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.

AD7796 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7796EBZ 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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