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AD7782:  2-Channel, Read-Only, Pin-Configured, 24-bit Sigma-Delta ADC

Product Details


The AD7782 and AD7783 are 24-bit low cost, low power Sigma Delta ADCs intended for dc and low frequency ac measurement applications. They are Read-only ADCs and have no writeable registers. This leads to a very simple interface between ADC and controller. Since their power consumption is low, the devices can be loop powered, battery powered or locally powered. The two-setting on-chip PGA can accommodate either a low-level or high-level analog input with no external signal conditioning hardware. Operating options are pin-programmable, not software programmable.

FEATURES and BENEFITS

  • 2-Channel, 24-Bit Σ-Δ ADC
    Pin Configurable (No Programmable Registers)
    Pin Selectable Input Channels
    Pin Programmable Input Ranges (±2.56 V or ±160 mV)
  • Fixed 19.79 Hz Update Rate
  • Simultaneous 50 Hz and 60 Hz Rejection
  • 24-Bit No Missing Codes
  • 18.5-Bit p-p Resolution (±2.56 V Range)
  • On-Chip Functions Rail-Rail Input Buffer and PGA
  • 16.5-Bit p-p Resolution (±160 mV Range)
  • Interface
    Master or Slave Mode of Operation
    Slave Mode:
    3-Wire Serial
    SPI®, QSPI™, MICROWIRE™, and DSP-Compatible
    Schmitt Trigger on SCLK
  • Power
    Specified for Single 3 V and 5 V Operation
    Normal: 1.3 mA @ 3 V
    Power-Down: 9 µA

Functional Block Diagram for AD7782

Documentation

Title Content Type File Type
AD7782: Read Only, Pin Configured 24-Bit Sigma-Delta ADC Datasheet (Rev A, 04/2012) (pdf, 126 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-614: Using the AD7782 in Low Power Applications  (pdf, 93 kB)
... This application note describes how to use the AD7782 in portable or low power applications.
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
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
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

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

AD7782 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7782BRU-REEL Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 2500 - $4.98 N  Material Info PCN/PDN Purchase
AD7782BRUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $5.06 $4.30 Y  Material Info PCN Purchase Sample
AD7782BRUZ-REEL Status: Production 16 ld TSSOP 16 Ind Reel, 2500 - $4.30 Y  Material Info PCN Purchase
AD7782BRUZ-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $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.


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