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AD7703:  20-Bit Sigma-Delta ADC

Product Details


The AD7703 is a 20-bit ADC which uses a sigma delta conversion technique. The analog input is continuously sampled by an analog modulator whose mean output duty cycle is proportional to the input signal. The modulator output is processed by an on-chip digital filter with a six-pole Gaussian response, which updates the output data register with 20-bit binary words at word rates up to 4kHz. The sampling rate, filter corner frequency and output word rate are set by a master clock input that may be supplied externally, or by an on-chip gate oscillator.

The inherent linearity of the ADC is excellent, and endpoint accuracy is ensured by self-calibration of zero and full scale which may be initiated at any time. The self-calibration scheme can also be extended to null system offset and gain errors in the input channel.

The output data is accessed through a serial port, which has two synchronous modes suitable for interfacing to shift registers or the serial ports of industry standard microcontrollers.

CMOS construction ensures low power dissipation, and a power down mode reduces the idle power consumption to only 10µW.

FEATURES and BENEFITS

  • Monolithic 16-Bit ADC
  • 0.0015% Linearity Error
  • On-Chip Self-Calibration Circuitry
  • Programmable Low-Pass Filter
    - 0.1 Hz to 10 Hz Corner Frequency
  • 0 V to +2.5 V or ±2.5 V Analog Input Range
  • 4 kSPS Output Data Rate
  • Flexible Serial Interface
  • Ultralow Power

Functional Block Diagram for AD7703

Documentation

Title Content Type File Type
AD7703: LC2MOS 20-Bit Sigma-Delta ADC Data Sheet  (Rev E, 04/2003) (pdf, 448 kB) Data Sheets PDF
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC  (pdf, 222 kB) Application Notes PDF
AN-349: Keys to Longer Life for CMOS  (pdf, 89 kB)
Here's How CMOS Can be Protected Against Abuse
Application Notes PDF
AN-368: Evaluation Board for the AD7701/AD7703 Sigma-Delta ADCs  (pdf, 507 kB) Application Notes PDF
AN-375: ADM2xxL Family for RS-232 Communications  (pdf, 351 kB)
Overview of ADM2xxL RS-232 Transceivers includes remote data acquisition system using the ADM241L and AD7701 Sigma-Delta ADC.
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
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

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

AD7703 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7703AN Status: Last Time Buy 20 ld PDIP 20 Ind Tube, 18 $23.29 $19.76 N  Material Info PCN/PDN Purchase
AD7703ANZ Status: Production 20 ld PDIP 20 Ind Tube, 18 $21.86 $18.54 Y  Material Info PCN Purchase
AD7703AR Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $22.62 $19.26 N  Material Info PCN Purchase
AD7703AR-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Ind Reel, 1000 - $19.26 N  Material Info PCN/PDN Purchase
AD7703ARZ Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $21.21 $18.07 Y  Material Info PCN Purchase
AD7703BNZ Status: Production 20 ld PDIP 20 Comm. Tube, 18 $25.99 $22.08 Y  Material Info PCN Purchase
AD7703BR-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Ind Reel, 1000 - $22.86 N  Material Info PCN/PDN Purchase
AD7703BRZ Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $25.22 $21.44 Y  Material Info PCN Purchase
AD7703BRZ-REEL Status: Production 20 ld SOIC - Wide 20 Ind Reel, 1000 - $21.44 Y  Material Info PCN Purchase
AD7703CNZ Status: Production 20 ld PDIP 20 Comm. Tube, 18 $33.48 $28.46 Y  Material Info PCN Purchase
AD7703CR Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $34.64 $29.46 N  Material Info PCN Purchase
AD7703CR-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Ind Reel, 1000 - $29.46 N  Material Info PCN/PDN Purchase
AD7703CRZ Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $32.51 $27.64 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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