National Semiconductor ADC0820 8-Bit High-Speed μP-Compatible A/D Converter with Track-Hold Function

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ADC0820 8-Bit High Speed µP Compatible A/D Converter with Track/Hold Function General Description Features

By using half-flash conversion technique, the 8-bit Built-in track-and-hold function

ADC0820 CMOS A/D offers 1.5 µs conversion time and No missing codes dissipates only m W of power. The half-flash technique No external clocking consists of comparators, most significant 4-bit ADC and Single supply VDC least significant 4-bit ADC.

Easy interface to all microprocessors, or operates

The input to the ADC0820 is tracked and held by the input stand-alone sampling circuitry eliminating the need for an external

Latched TRI-STATE® output

sample-and-hold for signals moving at less than m V/µs.

Logic inputs and outputs meet both MOS and T2L

For ease of interface to microprocessors, the ADC0820 has voltage level specifications been designed to appear as memory location or I/O port

Operates ratiometrically or with any reference value

without the need for external interfacing logic.

equal to or less than VCC 0V to 5V analog input voltage range with single 5V

Key Specifications supply

No zero or full-scale adjust required

Resolution Bits

Overflow output available for cascading

Conversion Time 2.5 µs Max (RD Mode)

0.3" standard width 20-pin DIP

1.5 µs Max (WR-RD Mode) 20-pin molded chip carrier package

Low Power m W Max 20-pin small outline package

Total Unadjusted 20-pin shrink small outline package (SSOP)

Error ±1⁄2 LSB and LSB

Connection and Functional Diagrams

Dual-In-Line, Small Outline

Molded Chip Carrier

and SSOP Packages

Package

DS005501-1 DS005501-33

TRI-STATE® is registered trademark of National Semiconductor Corporation.

National Semiconductor Corporation DS005501 www.national.com