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AD7709:  16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port

Product Details


The AD7709 is a complete analog front-end for low frequency measurement applications. The AD7709 contains a 16-bit sigma delta ADC with PGA and can be configured as 2 fully-differential input channels or 4 pseudo-differential input channels. Inputs signal ranges from 20mV to 2.56V can be directly converted using the AD7709. These signals can be converted directly from a transducer without the need for signal conditioning. Other on-chip features include three software configurable current sources, switchable reference inputs, low side power switches and a 4-bit digital I/O port.

FEATURES and BENEFITS

  • 16-Bit Σ-Δ ADC
  • Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz Update Rate
  • VREF Select ™ Allows Absolute and Ratiometric Measurement Capability
  • Programmable Gain Front End
  • ISOURCE Select
  • 16-Bit No Missing Codes
  • 13-Bit p-p Resolution @ 20 Hz, 20 mV Range
  • 16-Bit p-p Resolution @ 20 Hz, 2.56 V Range

Functional Block Diagram for AD7709

Documentation

Title Content Type File Type
AD7709: 16-Bit Sigma Delta ADC with Switchable Current Sources Data Sheet  (Rev A, 03/2003) (pdf, 422 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-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
Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs 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
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

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

AD7709 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7709ARU-REEL Status: Last Time Buy 24 ld TSSOP 24 Ind Reel, 2500 - $4.55 N  Material Info PCN/PDN Purchase
AD7709ARU-REEL7 Status: Contact ADI 24 ld TSSOP 24 Ind Reel, 1000 - - N  Material Info PCN/PDN Contact ADI
AD7709ARUZ Status: Production 24 ld TSSOP 24 Ind Tube, 62 $4.63 $3.94 Y  Material Info PCN Purchase
AD7709ARUZ-REEL7 Status: Production 24 ld TSSOP 24 Ind Reel, 1000 - $3.94 Y  Material Info PCN Purchase
AD7709BRU Status: Production 24 ld TSSOP 24 Ind Tube, 62 $6.14 $5.22 N  Material Info PCN Purchase
AD7709BRU-REEL7 Status: Contact ADI 24 ld TSSOP 24 Ind Reel, 1000 - - N  Material Info PCN/PDN Contact ADI
AD7709BRUZ Status: Production 24 ld TSSOP 24 Ind Tube, 62 $5.31 $4.51 Y  Material Info PCN Purchase Sample
AD7709BRUZ-REEL Status: Production 24 ld TSSOP 24 Ind Reel, 2500 - $4.51 Y  Material Info PCN Purchase
AD7709BRUZ-REEL7 Status: Production 24 ld TSSOP 24 Ind Reel, 1000 - $4.51 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.


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