Analog Devices MX7821 Product Info

• 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

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 V_SS 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.

Applications

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