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ADC0801/ADC0802/ADC0803/ADC0804/ADC0805

8-Bit µP Compatible A/D Converters

General Description

The

ADC0801,

ADC0802,

ADC0803,

ADC0804

and

ADC0805 are CMOS 8-bit successive approximation A/D

converters

that

use

differential

potentiometric

ladder — similar to the 256R products. These converters are

designed to allow operation with the NSC800 and INS8080A

derivative control bus with TRI-STATE output latches directly

driving the data bus. These A/Ds appear like memory loca-

tions or I/O ports to the microprocessor and no interfacing

logic is needed.

Differential analog voltage inputs allow increasing the

common-mode rejection and offsetting the analog zero input

voltage value. In addition, the voltage reference input can be

adjusted to allow encoding any smaller analog voltage span

to the full 8 bits of resolution.

Features

Compatible with 8080 µP derivatives — no interfacing

logic needed - access time - 135 ns

Easy interface to all microprocessors, or operates “stand

alone”

Differential analog voltage inputs

Logic inputs and outputs meet both MOS and TTL

voltage level specifications

Works with 2.5V (LM336) voltage reference

On-chip clock generator

0V to 5V analog input voltage range with single 5V

supply

No zero adjust required

0.3" standard width 20-pin DIP package

20-pin molded chip carrier or small outline package

Operates ratiometrically or with 5 V

DC, 2.5 VDC,or

analog span adjusted voltage reference

Key Specifications

Resolution

8 bits

Total error

±1⁄4 LSB, ±1⁄2 LSB and ±1 LSB

Conversion time

100 µs

Connection Diagram

Ordering Information

TEMP RANGE

0˚C TO 70˚C

−40˚C TO +85˚C

±1⁄4 Bit Adjusted

ADC0801LCN

ERROR

±1⁄2 Bit Unadjusted

ADC0802LCWM

ADC0802LCN

±1⁄2 Bit Adjusted

ADC0803LCN

±1Bit Unadjusted

ADC0804LCWM

ADC0804LCN

ADC0805LCN/ADC0804LCJ

PACKAGE OUTLINE

M20B — Small

Outline

N20A — Molded DIP

Z-80® is a registered trademark of Zilog Corp.

ADC080X

Dual-In-Line and Small Outline (SO) Packages

DS005671-30

See Ordering Information

November 1999

DS005671

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