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AD7708:  16-Bit 8/10-Channel, Low Voltage, Low Power, Sigma Delta ADC

Product Details


The AD7708/18 are complete analog front-ends for low frequency measurement applications. The AD7718 contains a 24-bit sigma delta ADC with PGA and can be configured as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels. Two pins on the device are configurable as analog inputs or reference inputs. The AD7708 is a 16-bit version of the AD7718. Inputs signal ranges from 20mV to 2.56V can be directly converted using these ADCs. Signals can be converted directly from a transducer without the need for signal conditioning.

FEATURES and BENEFITS

  • 8-/10-Channel, High Resolution Σ-Δ ADCs
  • 16-Bit Resolution
  • Factory-Calibrated
  • Single Conversion Cycle Setting
  • Programmable Gain Front End
  • Simultaneous 50 Hz and 60 Hz Rejection
  • VREF Select ™ Allows Absolute and Ratiometric Measurement Capability
  • Operation Can Be Optimized for Analog Performance (CHOP = 0) or
    Channel Throughput (CHOP= 1)

Functional Block Diagram for AD7708

Documentation

Title Content Type File Type
AD7708/AD7718: 16-Bit 8/10-Channel, Low Voltage, Low Power, Sigma Delta ADC Data Sheet (Rev 0, 08/2001) (pdf, 328 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-611: 50 Hz/60Hz Rejection on Sigma-Delta ADCs  (pdf, 360 kB)
Rejection of 50 Hz and 60 Hz interference is a requirement in many industrial settings. This Application Note outlines how the AD7708/AD7718,AD7709,AD7719, AD7782/AD7783 Sigma-Delta ADCs are used for optimal rejection of these frequencies.
Application Notes PDF
AN-610: The PGA on Sigma-Delta ADCs  (pdf, 152 kB)
The AD7708/AD7718,AD7709,AD7719,AD7782/AD7783 high resolution Sigma-Delta ADCs all feature a Programmable Gain Amplifier (PGA)at the input to the Sigma-Delta modulator. This Application Note discusses the use and benefits of this PGA.
Application Notes PDF
AN-609: Chopping on Sigma-Delta ADCs  (pdf, 232 kB)
Chopping is a technique that can be used to cancel offset voltages and other low frequency errors. This Application Note outlines how chopping is implemented on the AD7708/AD7718,AD7709,AD7719,AD7782/AD7783 high resolution Sigma-Delta ADCs and discusses the resulting benefits it brings.
Application Notes PDF
AN-608: Input Buffers on Sigma-Delta ADCs  (pdf, 284 kB)
The AD7708/AD7718,AD7709,AD7719,AD7782/AD7783 high resolution Sigma-Delta ADCs feature a high impedance buffer at the input to the ADC. This application note discusses the significant benefits and various system design considerations that result from the integration of on-chip buffers.
Application Notes PDF
AN-665: Channel Switching Using Σ-Δ ADCs  (pdf, 84 kB)
This application note refers to the AD7708 and AD7718. Data sheets specify the update rate for Σ-Δ ADCs.
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
Sigma Delta ADCs (< 15 kSPS) Product Selection Guide HTML
RAQs index Rarely Asked Questions 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
AD7708 IBIS Model IBIS Models 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

Companion Products

Suggested Companion Products


Recommended Voltage References for the AD7708

  • For precision 2.5V applications with AVdd = 5V, we recommend AD780, REF43 or the REF192.
  • For precision 1.2V applications with AVdd = 3V, we recommend the AD589, AD1580 or the ADR512.
Recommended Digital Isolators for the AD7708
  • For optocoupler alternatives, see our digital isolator selection tables, ADuMxxxx.
  • For process control applications, we recommend the ADuM1400 and the ADuM1200 icoupler.
  • For isolated USB designs in healthcare and industrial control, we recommend the ADuM4160.
Recommended Power Solutions

  • For selecting voltage regulator products, use ADIsimPower.

Were these recommendations helpful?

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Price, packaging, availability

AD7708 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7708BR Status: Production 28 ld SOIC - Wide 28 Ind Tube, 27 $5.47 $4.65 N  Material Info PCN Purchase
AD7708BR-REEL Status: Production 28 ld SOIC - Wide 28 Ind Reel, 1000 - $4.65 N  Material Info PCN Purchase
AD7708BR-REEL7 Status: Production 28 ld SOIC - Wide 28 Ind Reel, 400 - $4.65 N  Material Info PCN Purchase
AD7708BRU Status: Production 28 ld TSSOP 28 Ind Tube, 50 $5.47 $4.65 N  Material Info PCN Purchase
AD7708BRU-REEL Status: Last Time Buy 28 ld TSSOP 28 Ind Reel, 2500 - $4.65 N  Material Info PCN/PDN Purchase
AD7708BRU-REEL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $4.65 N  Material Info PCN Purchase
AD7708BRUZ Status: Production 28 ld TSSOP 28 Ind Tube, 50 $4.74 $4.03 Y  Material Info PCN Purchase Sample
AD7708BRUZ-REEL Status: Production 28 ld TSSOP 28 Ind Reel, 2500 - $4.03 Y  Material Info PCN Purchase
AD7708BRUZ-REEL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $4.03 Y  Material Info PCN Purchase
AD7708BRZ Status: Production 28 ld SOIC - Wide 28 Ind Tube, 27 $4.74 $4.03 Y  Material Info PCN Purchase Sample
AD7708BRZ-REEL Status: Production 28 ld SOIC - Wide 28 Ind Reel, 1000 - $4.03 Y  Material Info PCN Purchase
AD7708BRZ-REEL7 Status: Production 28 ld SOIC - Wide 28 Ind Reel, 400 - $4.03 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.

AD7708 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7708EBZ 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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