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AD7783:  Read-Only, Pin-Configured, 24-bit Sigma-Delta ADC with Excitation Current Sources

Product Details


The AD7783 is a complete analog front end for low frequency measurement applications. The 24-bit sigma-delta ADC contains one fully differential input channel that can be configured with a gain of 1 or 16 allowing full-scale input signal ranges of ±2.56 V or ±160 mV from a +2.5 V differential reference input. It also contains two 200 mA integrated current sources.

The AD7783 has an extremely simple, read-only digital interface that can be operated in master mode or slave mode. There are no on-chip registers to be programmed. The input signal range and current source selection are configured using two external pins.

The device operates from a 32.768 kHz crystal with an on-chip PLL generating the required internal operating frequency. The output data rate from the part is fixed via the master clock at 19.79 Hz and provides simultaneous 50 Hz and 60 Hz rejection at this update rate. At this update rate, 18-bit p-p resolution can be obtained.

The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.9 mW. The AD7783 is available in a 16-lead TSSOP.

Another part in the AD778x family is the AD7782. It is similar to the AD7783 except it has no integrated current sources and two differential input channels.

Applications

  • Sensor Measurement
  • Industrial Process Control
  • Temperature Measurement
  • Pressure Measurement
  • Weigh Scales
  • Portable Instrumentation

FEATURES and BENEFITS

  • Single-Channel, 24-Bit Σ-Δ ADC
  • Pin Configurable (No Programmable Registers)
    - ISOURCE SelectTM
    - 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)
  • 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
  • ON-CHIP FUNCTIONS
    -- Rail-to-Rail Input Buffer and PGA

Functional Block Diagram for AD7783

Documentation

Title Content Type File Type
AD7783: Read-Only, Pin Configured 24-Bit Σ-Δ ADC With Excitation Current Sources Data Sheet  (Rev C, 10/2011) (pdf, 217 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-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
Remote Three-Wire RTDs Can Multiplex Accurately To Measurement System
(Electronic Design, December 23, 2002)
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

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

AD7783 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7783BRU Status: Last Time Buy 16 ld TSSOP 16 Ind Tube, 96 $5.85 $4.98 N  Material Info PCN/PDN Purchase
AD7783BRU-REEL Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 2500 - $4.98 N  Material Info PCN/PDN Purchase
AD7783BRU-REEL7 Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 1000 - $4.98 N  Material Info PCN/PDN Purchase
AD7783BRUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $5.06 $4.30 Y  Material Info PCN Purchase Sample
AD7783BRUZ-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.

AD7783 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7783EBZ Status: Last Time Buy Evaluation Board - Yes - Contact ADI

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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