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AD7856:  5 V Single-Supply, 8-Channel, 14-Bit, 285 kSPS, Serial Sampling ADC

Product Details

The AD7856 is a high speed, low power, 14-bit Analog-to-Digital Converter (ADC) that operates from a single 5 V power supply. The ADC powers up with a set of default conditions at which time it can be operated as a read only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature; and it has a number of power-down options for low power applications.

The AD7856 is capable of 285 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7856 voltage range is 0 to VREF with both straight binary and 2s complement output coding. Input signal range is to the supply and the part is capable of converting full power signals to 20 MHz.

CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 24-pin, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages.


  • Single 5 V Supply
  • 285 kSPS Throughput Rate
  • Self- and System Calibration with Autocalibration on Power-Up
  • Eight Single-Ended or Four Pseudo-Differential Inputs
  • Low Power: 60 mW Typ
  • Automatic Power-Down After Conversion (2.5 µW Typ)
  • Flexible Serial Interface: 8051/SPI®/QSPI™/µP Compatible
  • 24-Lead DIP, SOIC and SSOP Packages

Functional Block Diagram for AD7856


Title Content Type File Type
AD7856: 5V Single-Supply, 8-Channel, 14-Bit 285 kSPS Sampling ADC Data Sheet (Rev A, 07/1998) (pdf, 294 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles 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.

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Price, packaging, availability

AD7856 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7856ANZ Status: Production 24 ld PDIP 24 Ind Tube, 15 $12.75 $10.84 Y  Material Info PCN Purchase
AD7856AR Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $14.30 $12.15 N  Material Info PCN Purchase
AD7856AR-REEL Status: Last Time Buy 24 ld SOIC - Wide 24 Ind Reel, 1000 - $12.15 N  Material Info PCN/PDN Purchase
AD7856ARSZ Status: Production 24 ld SSOP 24 Ind Tube, 59 $11.79 $10.02 Y  Material Info PCN Purchase
AD7856ARSZ-REEL7 Status: Production 24 ld SSOP 24 Ind Reel, 500 $11.79 $10.02 Y  Material Info PCN Purchase
AD7856ARZ Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $12.38 $10.52 Y  Material Info PCN Purchase Sample
AD7856KR-REEL Status: Last Time Buy 24 ld SOIC - Wide 24 Comm. Reel, 1000 - $13.91 N  Material Info PCN/PDN Purchase
AD7856KR-REEL7 Status: Obsolete 24 ld SOIC - Wide 24 Comm. Reel, 400 - - N  Material Info Notify Me Contact ADI
AD7856KRZ Status: Production 24 ld SOIC - Wide 24 Comm. Tube, 31 $14.88 $12.64 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.

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