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a

ADG774

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., 1998

CMOS

3 V/5 V, Wide Bandwidth Quad 2:1 Mux

FUNCTIONAL BLOCK DIAGRAM

1 OF 2

DECODER

ADG774

EN

IN

S1A

S1B

S2A

S2B

S3A

S3B

S4A

S4B

D1

D2

D3

D4

FEATURES

Low Insertion Loss and On Resistance: 4

Typical

On-Resistance Flatness <2

Bandwidth >200 MHz

Single 3 V/5 V Supply Operation

Rail-to-Rail Operation

Very Low Distortion: <1%

Low Quiescent Supply Current (100 nA Typical)

Fast Switching Times

TTL/CMOS Compatible

APPLICATIONS

10/100 Base-TX/T4

100VG-AnyLAN

Token Ring 4 Mbps/16 Mbps

ATM25/155

NIC Adapter and Hubs

Audio and Video Switching

Relay Replacement

GENERAL DESCRIPTION

The ADG774 is a monolithic CMOS device comprising four

2:1 multiplexer/demultiplexers with high impedance outputs.

The CMOS process provides low power dissipation yet gives

high switching speed and low on resistance. The on-resistance

variation is typically less than 0.5

Ω with an input signal ranging

from 0 V to 5 V.

The bandwidth of the ADG774 is greater than 200 MHz and

this, coupled with low distortion (typically 0.5%), makes the

part suitable for switching fast ethernet signals.

The on-resistance profile is very flat over the full analog input

range ensuring excellent linearity and low distortion when switch-

ing audio signals. Fast switching speed, coupled with high signal

bandwidth, also makes the parts suitable for video signal switch-

ing. CMOS construction ensures ultralow power dissipation

making the parts ideally suited for portable and battery powered

instruments.

The ADG774 operates from a single 3.3 V/5 V supply and is

TTL logic compatible. The control logic for each switch is shown

in the Truth Table.

These switches conduct equally well in both directions when ON,

and have an input signal range that extends to the supplies. In

the OFF condition, signal levels up to the supplies are blocked.

The ADG774 switches exhibit break-before-make switching

action.

PRODUCT HIGHLIGHTS

1. Wide bandwidth data rates >200 MHz.

2. Ultralow Power Dissipation.

3. Extended Signal Range.

The ADG774 is fabricated on a CMOS process giving an

increased signal range that fully extends to the supply rails.

4. Low leakage over temperature.

5. Break-Before-Make Switching.

This prevents channel shorting when the switches are config-

ured as a multiplexer.

6. Crosstalk is typically –70 dB @ 30 MHz.

7. Off isolation is typically –60 dB @ 10 MHz.