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AD7820:  8-Bit, 2µS, Sampling A/D Converter

Product Details


The AD7820 is a high speed, microprocessor-compatible 8-bit ADC which uses a half-flash conversion technique to achieve a conversion time of 1.36 µs. The converter has a 0 V to +5 V analog input voltage range with a single +5 V supply.

The half-flash technique consists of 31 comparators, a most significant 4-bit ADC and a least significant 4-bit ADC. The input to the AD7820 is tracked and held by the input sampling circuitry, eliminating the need for an external sample-and-hold for signals with slew rates less than 100 mV/µs.

The part is designed for ease of microprocessor interface with the AD7820 appearing as a memory location or I/O port without the need for external interfacing logic. All digital outputs use latched, three-state output buffer circuitry to allow direct connection to a microprocessor data bus or system input port. A non-three state overflow output is also provided to allow cascading of devices to give higher resolution.

FEATURES and BENEFITS

  • Fast Conversion Time: 1.36 µs max
  • Built-In Track-and-Hold Function
  • No Missed Codes
  • No User Trims Required
  • Single +5V Supply
  • Ratiometric Operation
  • No External Clock
  • Extended Temperature Range Operation
  • Skinny 20-Pin DIP, SOIC and 20-Terminal Surface Mount Packages

Functional Block Diagram for AD7820

Documentation

Title Content Type File Type
AD7820: Military Data Sheet  (Rev B, 03/1996) (pdf) Data Sheets PDF
AD7820: LC2MOS High Speed µP-Compatible 8-Bit ADC with Track/Hold Function Scanned Data Sheet (Rev A, 09/1996) (pdf, 609 kB) Data Sheets PDF
AN-215: Designer's Guide to Flash-ADC Testing, Part 1, 2 & 3  (pdf, 1596 kB)
Flash ADCs Provide the Basis for High Speed Conversion.
Application Notes PDF
AN-299: Simple Circuit Provides Ratiometric Reference Levels for AD782X Family of Half-Flash ADCs  (pdf, 170 kB) Application Notes PDF
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary 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

AD7820 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
5962-8865001RA Status: Production CERDIP GLASS SEAL 20 Mil Tube, 18 $83.02 $67.31 N  Material Info PCN Purchase
5962-88650022A Status: Production LCC:CER LEADLESS CHIP CARR 20 Mil Tube, 54 $126.40 $87.64 N  Material Info PCN Purchase
5962-8865002RA Status: Production CERDIP GLASS SEAL 20 Mil Tube, 18 $64.97 $52.72 N  Material Info PCN Purchase
AD7820CQ Status: Production CERDIP GLASS SEAL 20 Ind Tube, 18 $26.23 $26.23 N  Material Info PCN Purchase
AD7820KN Status: Production 20 ld PDIP 20 Comm. Tube, 18 $13.08 $11.11 N  Material Info PCN Purchase
AD7820KNZ Status: Production 20 ld PDIP 20 Comm. Tube, 18 $10.79 $9.16 Y  Material Info PCN Purchase
AD7820KP-REEL Status: Production 20 ld PLCC 20 Comm. Reel, 1000 - $9.68 N  Material Info PCN Purchase
AD7820KPZ Status: Production 20 ld PLCC 20 Comm. Tube, 49 $12.60 $10.16 Y  Material Info Notify Me Purchase
AD7820KPZ-REEL Status: Production 20 ld PLCC 20 Comm. Reel, 1000 - $10.16 Y  Material Info Notify Me Purchase
AD7820KR Status: Production 20 ld SOIC - Wide 20 Comm. Tube, 37 $14.56 $11.75 N  Material Info PCN Purchase
AD7820KR-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Comm. Reel, 1000 - $11.75 N  Material Info PCN/PDN Purchase
AD7820KRZ Status: Production 20 ld SOIC - Wide 20 Comm. Tube, 37 $12.60 $10.16 Y  Material Info PCN Purchase
AD7820KRZ-REEL Status: Production 20 ld SOIC - Wide 20 Comm. Reel, 1000 - $10.16 Y  Material Info PCN Purchase
AD7820LN Status: Production 20 ld PDIP 20 Comm. Tube, 18 $18.35 $15.58 N  Material Info PCN Purchase
AD7820LNZ Status: Production 20 ld PDIP 20 Comm. Tube, 18 $15.89 $13.48 Y  Material Info PCN Purchase
AD7820LP-REEL Status: Last Time Buy 20 ld PLCC 20 Comm. Reel, 1000 - $13.68 N  Material Info PDN Purchase
AD7820LPZ Status: Production 20 ld PLCC 20 Comm. Tube, 49 $16.84 $13.68 Y  Material Info Notify Me Purchase
AD7820LR-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Comm. Reel, 1000 - $13.68 N  Material Info PCN/PDN Purchase
AD7820LRZ Status: Production 20 ld SOIC - Wide 20 Comm. Tube, 37 $16.84 $13.68 Y  Material Info PCN Purchase
AD7820LRZ-REEL Status: Production 20 ld SOIC - Wide 20 Comm. Reel, 1000 - $13.68 Y  Material Info PCN Purchase
AD7820TCHIPS Status: Last Time Buy CHIPS OR DIE 0 Comm. Tray, 121 $31.63 $31.63 Y  Material Info PDN Purchase
AD7820TQ Status: Production CERDIP GLASS SEAL 20 Mil Tube, 18 $49.90 $49.90 N  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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