CMOS High-Speed 8-Bit A/D Converter with Track/Hold Function

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The ADC0820 is a high speed, microprocessor compatible, 8 bit analog-to-digital converter which uses a half-flash technique to achieve a conversion time of 1.4 μs. The converter has a 0V to +5V analog input range and uses a single +5V supply.

A built-in track-and-hold function is included, eliminating the need for an external track-and-hold for input slew rates up to 100mV/μs.

The A/D easily interfaces with microprocessors by appearing as a memory location or I/O port without the need for external interfacing logic. Data outputs use latched, three-state buffer circuitry to allow direct connection to a microprocessor data bus or system I/O port. An over-flow output is also provided for cascading devices to achieve higher resolution.

Maxim's ADC0820 is pin-compatible with National Semiconductor's ADC0820 and provides improved specifications. It is packaged in 20-pin Small Outline, DIP and CERDIP packages.
ADC0820: Functional Block Diagram ADC0820: Functional Block Diagram Enlarge+

Key Features

  • Fast Conversion Time: 1.4μs Max.
  • Built-in Track-and-Hold Function
  • No Missing Codes
  • No User Adjustments Required
  • Single +5V Supply
  • No External Clock
  • Easy Interface To Microprocessors


  • Audio Systems
  • Digital Signal Processing
  • High Speed Data Acquisition
  • High-Speed Servo Loops
  • Telecommunications

See parametric specs for Precision ADCs (< 5Msps) (432)

Part NumberResolution
# Input ChannelsConv. Rate
ADC ArchitectureData BusDiff/S.E. InputExternal VREF
External VREF
Unipolar VIN
(ADC)(max)(min)(max)(max)(See Notes)
ADC0820 81400FlashµP/8S.E. Only055
SOIC (W)/20
$1.97 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: ADC0820 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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