AD7578:  CMOS 12-Bit Successive Approximation ADC

Product Details

The AD7578 is a medium speed, monolithic 12-bit CMOS A/D converter which uses the successive approximation technique to provide a conversion time of 100µs. An auto-zero cycle occurs at the start of each conversion resulting in very low system offset voltages, typically less than 100µV. The device is designed for easy microprocessor interfacing using standard control signals; CS (decoded device address), RD (READ) and WR (WRITE).

Conversion results are available in two bytes, 8LSBs and 4MSBs, over an 8-bit three state output bus. Either byte can be read first. Two converter busy flags are available to facilitate polling of the converter's status.

The analog input voltage range is 0V to +5V when using a reference voltage of +5V.

Product Highlights

  1. The AD7578 is a complete 12-bit A/D converter in a 24-pin
    package requiring only a few passive components and a voltge reference
  2. Autozero cycle realizes very low offset voltages, typically 100µV
  3. Standard microprocessor control signals to allow easy interfacing
    to most popular 8- and 16-bit processors.
  4. Monolithic construction for increased reliability and small 0.3", 24-pin package.


  • 12-Bit Successive Approximation ADC
  • No Missed Codes Over Full Temperature Range
  • Low Total Unadjusted Error ±1LSB max
  • High Impedance Analog Input
  • Autozero Cycle for Low Offset Voltage
  • Low Power, 75mW typ
  • Small Size: 0.3", 24-Pin Package
  • Conversion Time of 100µs

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

AD7578 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7578BQ Status: Production CERDIP GLASS SEAL 24 Comm. Tube, 15 $38.92 $35.02 N  Material Info PCN Purchase
AD7578KN Status: Production PLASTIC DIP 24 Comm. Tube, 15 $29.58 $25.13 N  Material Info PCN Purchase
AD7578KNZ Status: Production 24 ld PDIP 24 Comm. Tube, 15 $26.94 $22.89 Y  Material Info PCN Purchase
AD7578TQ Status: Production CERDIP GLASS SEAL 24 Mil Tube, 15 $92.67 $92.67 N  Material Info PCN Purchase
AD7578TQ/883B Status: Production CERDIP GLASS SEAL 24 Comm. Tube, 15 $122.36 $104.01 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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