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AD7813:  +2.7 V to +5.5 V, 400 kSPS 8-/10-Bit Sampling ADC

Product Details

The AD7813 is a high speed, microprocessor-compatible, 8-/10-bit analog-to-digital converter with a maximum through-put of 400 kSPS. The converter operates off a single +2.7 V to +5.5 V supply and contains a 2.3 ms successive approximation A/D converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. The 10-bit conversion result is read by carrying out two 8-bit read operations. The first read operation accesses the 8 MSBs of the ADC conversion result and the second read accesses the 2 LSBs. Using only address decoding logic the AD7813 is easily mapped into the microprocessor address space.

When used in its power-down mode, the AD7813 automatically powers down at the end of a conversion and powers up at the start of a new conversion. This feature significantly reduces the power consumption of the part at lower throughput rates. The AD7813 can also operate in a high speed mode where the part is not powered down between conversions. In this mode of operation the part is capable of providing 400 kSPS throughput.

The part is available in a small, 16-pin, 0.3" wide, plastic dual-in- line package (DIP), in a 16-pin, 0.15" wide, narrow body small outline IC (SOIC) and in a 16-pin thin shrink small outline package (TSSOP).


  • 8-/10-Bit ADC with 2.3 µs Conversion Time
  • On-Chip Track and Hold
  • Operating Supply Range: 2.7 V to 5.5 V
  • 8-Bit Parallel Interface
    8-Bit + 2-Bit Read
  • Analog Input Range: 0 V to VREF
  • Reference Input Range: 1.2 V to VDD
  • Specifications at 2.7 V–3.6 V and 5 V ± 10%
  • Power Performance
    - Normal Operation
       10.5 mW, VDD = 3 V
    - Automatic Power-Down
       34.6 µW @ 1 kSPS, VDD = 3 V

Functional Block Diagram for AD7813


Title Content Type File Type
AD7813: +2.7 V to +5.5 V, 400 kSPS 8-/10-Bit Sampling ADC Data Sheet (Rev C, 10/2000) (pdf, 188 kB) Data Sheets PDF
AN-348: Avoiding Passive-Component Pitfalls  (pdf, 931 kB)
The Wrong Passive Component Can Derail Even the Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.
Application Notes 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

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Price, packaging, availability

AD7813 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7813YNZ Status: Production 16 ld PDIP 16 Ind Tube, 25 $3.93 $3.07 Y  Material Info PCN Purchase
AD7813YRUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $3.81 $2.98 Y  Material Info PCN Purchase
AD7813YRUZ-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $2.98 Y  Material Info PCN Purchase
AD7813YRZ Status: Production 16 ld SOIC 16 Ind Tube, 48 $3.81 $2.98 Y  Material Info PCN Purchase
AD7813YRZ-REEL Status: Last Time Buy 16 ld SOIC 16 Ind Reel, 2500 - $2.98 Y  Material Info PCN/PDN Purchase
AD7813YRZ-REEL7 Status: Production 16 ld SOIC 16 Ind Reel, 1000 - $2.98 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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