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AD7719:  Low Voltage, Low Power, 16-/24-Bit, Dual Sigma Delta ADC

Product Details


The AD7719 is a complete analog front-end for low frequency measurement applications. It contains two high-resolution sigma delta ADCs, switchable matched excitation current sources, low-side power switches, digital I/O port and temperature sensor. The 24-bit main channel with PGA accepts fully differential, unipolar and bipolar input signal ranges from REFIN1/128 to REFIN1. Signals can be converted directly from a transducer without the need for signal conditioning. The 16-bit aux channel does not have a PGA and has an input signal range of REFIN2 or REFIN2/2.

FEATURES and BENEFITS

High Resolution Σ-Δ ADCs

  • 2 Independent ADCs (16- and 24-Bit Resolution)
  • Factory-Calibrated (Field Calibration Not Required)
  • Output Settles in 1 Conversion Cycle (Single Conversion Mode)
  • Programmable Gain Front End
  • Simultaneous Sampling and Conversion of 2 Signal Sources
  • Separate Reference Inputs for Each Channel
  • Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz Update Rate

ISOURCE Select

  • 24-Bit No Missing Codes—Main ADC
  • 13-Bit p-p Resolution @ 20 Hz, 20 mV Range
  • 18-Bit p-p Resolution @ 20 Hz, 2.56 V Range

Interface

  • 3-Wire Serial
  • SPI®, QSPI™, MICROWIRE™, and DSP Compatible
  • Schmitt Trigger on SCLK

Functional Block Diagram for AD7719

Documentation

Title Content Type File Type
AD7719: Low Voltage, Low Power, Factory-Calibrated 16-/24- Bit Dual Σ-Δ ADC Data Sheet  (Rev A, 04/2003) (pdf, 509 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
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
Improved Data Acquisition Using a New Monolithic Dual-ADC Front End
(Analog Dialogue, Vol. 35, No. 2, March-May, 2001)
Analog Dialogue 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

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

AD7719 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7719BR-REEL Status: Last Time Buy 28 ld SOIC - Wide 28 Ind Reel, 1000 - $10.25 N  Material Info PCN/PDN Purchase
AD7719BR-REEL7 Status: Last Time Buy 28 ld SOIC - Wide 28 Ind Reel, 400 - $10.25 N  Material Info PCN/PDN Purchase
AD7719BRUZ Status: Production 28 ld TSSOP 28 Ind Tube, 50 $10.42 $8.87 Y  Material Info PCN Purchase Sample
AD7719BRUZ-REEL Status: Last Time Buy 28 ld TSSOP 28 Ind Reel, 2500 - $8.87 Y  Material Info PCN/PDN Purchase
AD7719BRUZ-REEL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $8.87 Y  Material Info PCN Purchase
AD7719BRZ Status: Production 28 ld SOIC - Wide 28 Ind Tube, 27 $10.42 $8.87 Y  Material Info PCN Purchase Sample
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.

AD7719 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7719EBZ 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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