REV. D

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a

Octal Sample-and-Hold

with Multiplexed Input

SMP08*

FUNCTIONAL BLOCK DIAGRAM

SW

SW

SW

SW

SW

SW

SW

SW

1 OF 8 DECODER

6

9

10

11

3

13

16

8

14

15

12

7

1

2

4

5

DGND

HOLD CAPS

(INTERNAL)

SMP08

INPUT

(LSB)

A

B

(MSB)

C

INH

FEATURES

Internal Hold Capacitors

Low Droop Rate

TTL/CMOS Compatible Logic Inputs

Single or Dual Supply Operation

Break-Before-Make Channel Addressing

Compatible With CD4051 Pinout

Low Cost

APPLICATIONS

Multiple Path Timing Deskew for ATE

Memory Programmers

Mass Flow/Process Control Systems

Multichannel Data Acquisition Systems

Robotics and Control Systems

Medical and Analytical Instrumentation

Event Analysis

Stage Lighting Control

GENERAL DESCRIPTION

The SMP08 is a monolithic octal sample-and-hold; it has eight

internal buffer amplifiers, input multiplexer, and internal hold

capacitors. It is manufactured in an advanced oxide isolated

CMOS technology to obtain high accuracy, low droop rate, and

fast acquisition time. The SMP08 has a typical linearity error of

only 0.01% and can accurately acquire a 10-bit input signal to

±1/2 LSB in less than 7 microseconds. The SMP08’s output

swing includes the negative supply in both single and dual sup-

ply operation.

The SMP08 was specifically designed for systems that use a

calibration cycle to adjust a multiple of system parameters. The

low cost and high level of integration make the SMP08 ideal for

calibration requirements that have previously required an

ASIC, or high cost multiple D/A converters.

*Protected by U.S. Patent No. 4,739,281.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,

U.S.A.

Tel: 617/329-4700

World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

© Analog Devices, Inc., 1996

The SMP08 is also ideally suited for a wide variety of sample-

and-hold applications including amplifier offset or VCA gain

adjustments. One or more SMP08s can be used with single or

multiple DACs to provide multiple set points within a system.

The SMP08 offers significant cost and size reduction over dis-

crete designs. It is available in a 16-pin plastic DIP, or surface-

mount SOIC package.