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Isolated 12-Bit Sampling

ANALOG-TO-DIGITAL CONVERTER

ISO808

®

FEATURES

q 100kHz SAMPLING RATE

q 1500Vrms ISOLATION CONTINUOUS

q 10

q 12-BIT SERIAL OUTPUT

q SINGLE +5V SUPPLY

q 28-PIN 0.6" PLASTIC DIP

APPLICATIONS

q INDUSTRIAL PROCESS CONTROL

q PC-BASED DATA ACQUISITION TEST

EQUIPMENT

DESCRIPTION

The ISO808 is a low-power isolated sampling ADC

using state-of-the-art CMOS structures and high volt-

age capacitors. The ISO808 contains a complete 12-bit

capacitor based SAR, ADC with S/H, clock, refer-

ence,

µP interface, serial out and galvanic isolation.

Laser-trimmed scaling resistors provide standard

industrial input ranges including

±10V, ±5V, 0-5V,

0-4V. They are available in 28-pin 0.6" wide plastic

DIP and are specified over the industrial temperature

range of –40

°C to +85°C.

PDS-1317B

Printed in U.S.A. October, 1996

ISO808

10k

Ω

4k

Ω

20k

Ω

5k

Ω

Internal

+2.5V Ref

Successive Approximation Register and Control Logic

Serial

Data

Out

Clock

Isolation

Barrier

20k

Ω

R1

IN

R2

IN

R3

IN

REF

CAP

BUSY

R/C

Data Clock

Serial Data

SB/BTC