ADG738/ADG739

a

REV. 0

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use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

CMOS, Low-Voltage, 3-Wire

Serially-Controlled, Matrix Switches

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

Tel: 781/329-4700

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

Fax: 781/326-8703

© Analog Devices, Inc., 2000

FEATURES

3-Wire Serial Interface

2.7 V to 5.5 V Single Supply

2.5

On Resistance

0.75

On-Resistance Flatness

100 pA Leakage Currents

Single 8-to-1 Multiplexer ADG738

Dual 4-to-1 Multiplexer ADG739

Power-On Reset

TTL/CMOS-Compatible

APPLICATIONS

Data Acquisition Systems

Communication Systems

Relay Replacement

Audio and Video Switching

GENERAL DESCRIPTION

The ADG738 and ADG739 are CMOS analog matrix switches

with a serially-controlled 3-wire interface. The ADG738 is an

8-channel matrix switch, while the ADG739 is a dual 4-channel

matrix switch. On resistance is closely matched between switches

and very flat over the full signal range.

The ADG738 and ADG739 utilize a 3-wire serial interface that

is compatible with SPI™, QSPI™, MICROWIRE™, and some

DSP interface standards. The output of the shift register DOUT

enables a number of these parts to be daisy-chained. On power-up,

the internal shift register contains all zeros and all switches

are in the OFF state.

Each switch conducts equally well in both directions when on,

making these parts suitable for both multiplexing and demulti-

plexing applications. As each switch is turned on or off by a

separate bit, these parts can also be configured as a type of switch

array, where any, all, or none of the eight switches may be closed

at any time. The input signal range extends to the supply rails.

All channels exhibit break-before-make switching action,

preventing momentary shorting when switching channels.

The ADG738 and ADG739 are available in 16-lead TSSOP

packages.

FUNCTIONAL BLOCK DIAGRAMS

S1

S8

SCLK

D

DIN

SYNC

ADG738

S1A

SCLK

DA

DIN

S4A

S1B

S4B

DB

ADG739

RESET

DOUT

DOUT

SYNC

INPUT SHIFT

REGISTER

INPUT SHIFT

REGISTER

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

PRODUCT HIGHLIGHTS

1. 3-Wire Serial Interface.

2. Single Supply Operation. The ADG738 and ADG739 are

fully specified and guaranteed with 3 V and 5 V supply rails.

3. Low On Resistance, 2.5

Ω typical.

4. Any configuration of switches may be on or off at any one time.

5. Guaranteed Break-Before-Make Switching Action.

6. Small 16-lead TSSOP Package.