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

Product Details

Key Features

Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 8
# Input Channels 1
Conv. Rate (ksps) (max) 500
Data Bus µP/8
ADC Architecture SAR
Diff/S.E. Input S.E. Only
Internal VREF (V) (nominal) 5
Unipolar VIN (V) (max) 5
Package/Pins SOIC (W)/20
Budgetary
Price (See Notes)
10.19
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Simplified Block Diagram

Technical Docs

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Sampling:
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Parameters

Parametric specs for Precision ADCs (<u><</u> 5Msps)
Resolution (bits) (ADC) 8
# Input Channels 1
Conv. Rate (ksps) (max) 500
Data Bus µP/8
ADC Architecture SAR
Diff/S.E. Input S.E. Only
Internal VREF (V) (nominal) 5
Unipolar VIN (V) (max) 5
Package/Pins SOIC (W)/20
Budgetary
Price (See Notes)
10.19

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MX7821: Functional Diagram MX7821: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.