µP-Compatible, 660ns, 8-Bit ADC with Track/Hold

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The MX7821 high-speed, microprocessor-compatible (μP), 8-bit analog-to-digital converter (ADC) is a plug-in upgrade fro the industry-standard 7820. The MX7821 uses a half-flash technique, resulting in a 660ns conversion time vs. 1.36μs for the 7820. A VSS pin, not supplied by the 7820, supports dual power supplies and bipolar analog inputs.

The MX7821 has track-and-hold function capable of digitizing a 100kHz signal, and is tested for both its static and dynamic capability. The converter-μP interface appears as a memory location or input/output port that requires no external interface logic. The data outputs use latched, three-state buffered circuitry for direct connection to a μP data bus or system input port. The MX7821 has an overflow output for cascading devices to attain higher resolution. The ADC's input/reference arrangement enables ratiometric operation. For a detailed description of MX7821 operation, refer to the MX7820 data sheet.
MX7821: Functional Diagram MX7821: Functional Diagram Enlarge+

Key Features

  • 660ns Conversion Time
  • 20-Pin Narrow DIP Package
  • No External Clock
  • Pin-Compatible Upgrade for Industry-Standard 7820
  • 100kHz Input Signal Bandwidth
  • Bipolar/Unipolar Inputs
  • Single +5V or Dual ±5V Supplies
  • Ratiometric Reference Inputs
  • Static and Dynamic Tested
  • Internal Track/Hold


  • 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. InputInternal VREF
Unipolar VIN
ADCmaxnominalmaxSee Notes
MX7821 81500SARµP/8S.E. Only5545-50
SOIC (W)/20
$8.98 @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.
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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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