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AD7706:  3V/5V, 1mW, 3-Channel Pseudo Differential, 16-Bit Sigma-Delta ADC

Product Details


The AD7705 and AD7706 are complete 16-bit, low-cost, Sigma Delta ADCs intended for dc and low-frequency ac measurement applications. Their low power (1 mW max @ 3 V) allows them to be used in loop-powered, battery-powered or locally-powered applications. The on-chip Programmable Gain Amplifier with gain settings from I through 128 can accommodate both low-level and high-level analog inputs with no external signal conditioning hardware.

The AD7705 has two differential channels while the AD7706 has one differential and two pseudo-differential channels. Differential reference inputs also allow maximum flexibility in tailoring the device for use in ratiometric applications.

FEATURES and BENEFITS

  • Three Pseudo Differential Input Channel ADCs
    - 16 Bits No Missing Codes
    - 0.003% Nonlinearity
  • Programmable Gain Front End
    - Gains from 1 to 128
  • Ability to Buffer the Analog Input
  • 2.7 V to 3.3 V or 4.75 V to 5.25 V Operation
  • Three-Wire Serial Interface
    - SPI®, QSPI™, MICROWIRE™ and DSP Compatible
    - Schmitt Trigger Input on SCLK
  • Power Dissipation 1 mW max @ 3 V
  • Standby Current 8 µA max
  • 16-Lead DIP, 16-Lead SOIC and TSSOP Packages

Functional Block Diagram for AD7706

Documentation

Title Content Type File Type
AD7705/AD7706: 3V/5V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADC Data Sheet  (Rev C, 05/2006) (pdf, 460 kB) Data Sheets 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-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-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
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
(Electronic Design, 1/12/06)
Technical Articles HTML
Designing and Applying Remote Field Instruments
by Albert O' Grady and Jim Ryan, Analog Devices B.V.
...Good things can come in small packages because of on-chip capabilities
(Control Engineering, September 1998)
Technical Articles HTML
Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs Technical Articles HTML
Ask the Applications Engineer-27: What problems am I most likely to run into when instrumenting an industrial system?
(Analog Dialogue, Vol. 33, No. 2, February, 1999)
Analog Dialogue HTML
RAQs index Rarely Asked Questions HTML
How do I use the serial interface on the AD7705/06/07 ADC? FAQs/RAQs HTML
What are the general design considerations when using the AD7705/06/07 ADC? FAQs/RAQs HTML
What are the calibration options on the AD7705/06/07 ADC? FAQs/RAQs HTML
What Architecture is used in the AD7705/06/07 ADC? FAQs/RAQs HTML
How do I get the best performance from the AD7705/06/07 ADC? 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
Sigma Delta Register Configuration Assistant
Easily program the configuration registers for the sigma delta ADCs. Use pull-down menus to determine the correct hex values to load into the registers, and generate pseudo-code.
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

AD7706 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7706BNZ Status: Production 16 ld PDIP 16 Ind Tube, 25 $5.21 $4.42 Y  Material Info PCN Purchase Sample
AD7706BR Status: Last Time Buy 16 ld SOIC - Wide 16 Ind Tube, 47 $5.67 $4.81 N  Material Info PCN/PDN Purchase
AD7706BR-REEL7 Status: Last Time Buy 16 ld SOIC - Wide 16 Ind Reel, 400 - $4.81 N  Material Info PCN/PDN Purchase
AD7706BRU Status: Production 16 ld TSSOP 16 Ind Tube, 96 $5.67 $4.81 N  Material Info PCN Purchase
AD7706BRU-REEL Status: Contact ADI 16 ld TSSOP 16 Ind Reel, 2500 - - N  Material Info PCN/PDN Contact ADI
AD7706BRU-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $4.81 N  Material Info PCN Purchase
AD7706BRUZ Status: Production 16 ld TSSOP 16 Comm. Tube, 96 $5.31 $4.52 Y  Material Info PCN Purchase
AD7706BRUZ-REEL Status: Production 16 ld TSSOP 16 Ind Reel, 2500 - $4.52 Y  Material Info PCN Purchase
AD7706BRUZ-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $4.52 Y  Material Info PCN Purchase
AD7706BRZ Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $5.06 $4.30 Y  Material Info PCN Purchase Sample
AD7706BRZ-REEL Status: Production 16 ld SOIC - Wide 16 Ind Reel, 1000 - $4.30 Y  Material Info PCN Purchase
AD7706BRZ-REEL7 Status: Production 16 ld SOIC - Wide 16 Ind Reel, 400 - $4.30 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.

AD7706 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7706EBZ Status: Production Evaluation Board $156.35 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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