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General Description

The MAX4548/MAX4549 serial-interface, programmable,

triple 3x2 audio/video crosspoint switches are ideal for

multimedia applications. The devices include three

crosspoint switch matrices, each containing three inputs

and two outputs. To improve off-isolation, each switch

matrix has a shunt input and each output is selectively

programmable for clickless or regular-mode operation. A

selectable set of internal resistive voltage dividers sup-

plies DC bias for each output when using AC-coupled

inputs. To improve crosstalk, the voltage dividers include

four externally accessible bypass points.

The MAX4548/MAX4549 feature 35

Ω max on-resis-

tance, 7

Ω on-resistance matching between channels,

5

Ω on-resistance flatness, and 0.07% total harmonic

distortion (THD). Additionally, they feature off-isolation

of -85dB at 20kHz and -72dB at 10MHz, with crosstalk

of -85dB at 20kHz and -55dB at 10MHz. The MAX4548

the MAX4549 uses a 3-wire SPI™/QSPI™/MICROWIRE™-

compatible serial interface. These parts are available in

36-pin SSOP packages and are specified for the

extended (-40°C to +85°C) operating range.

Applications

Set-Top Boxes

PC Multimedia Boards

Video Conferencing Systems

High-End Audio Systems

Security Systems

Features

o Selectable Soft-Switching Mode for “Clickless”

Audio Operation

o 22

Ω Typical On-Resistance (+5V Supply)

o 5

Ω Typical On-Resistance Matching Between

Channels

o 2

Ω Typical On-Resistance Flatness

o Audio Performance

-85dB Off-Isolation at 20kHz

-85dB Crosstalk at 20kHz

0.07% THD with 600

Ω Load

o Video Performance

-72dB Off-Isolation at 10MHz

-55dB Crosstalk at 10MHz

o Serial Interface

3-Wire SPI/QSPI/MICROWIRE-Compatible

(MAX4549)

o Single-Supply Operation from +2.7V to +5.5V

Serially Controlled, Triple 3x2 Audio/Video

Crosspoint Switches

________________________________________________________________

Maxim Integrated Products

1

36

35

34

33

32

31

30

29

28

27

26

25

24

23

1

2

3

4

5

6

7

8

9

10

11

12

13

14

CBIASL

COM1C

MID5

COM2C

GND

COM1A

ABIASH

MID1

COM1B

MID2

COM2A

MID3

COM2B

MID4

N03B

N03A

SB

N02B

NO2A

SA

N01B

NO1A

V+

NO3C

SC

NO2C

CBIASH

NO1C

SSOP

TOP VIEW

MAX4548

MAX4549

22

21

20

19

15

16

17

18

A1 (DOUT)

( ) ARE FOR MAX4549

ABIASL

V+

A0 (CS)

SCL (SCLK)

SDA (DIN)

GND

GND

19-1496; Rev 0; 6/99

PART

MAX4548EAX

MAX4549EAX

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

36 SSOP

36 SSOP

Pin Configuration

Ordering Information

Functional Diagram appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.