MAXIM MAX4550 MAX4570 Serially Controlled, Dual 4x2, Clickless Audio Video Analog Crosspoint Switches

19-1397; Rev 0; 10/98

EVALUATION KIT AVAILABLE

Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches General Description Features

The MAX4550/MAX4570 serial-interface, programma- Selectable Soft Switching Mode for Clickless ble, dual 4x2 audio/video crosspoint switches are ideal

Audio Operation

for multimedia applications. Each device contains two

identical crosspoint switch arrays, each with four inputs 43Ω Typical On-Resistance (±5V Supplies)

and two outputs. To improve off-isolation, use the addi-

5Ω Typical On-Resistance Matching Between

tional crosspoint inputs SA and SB as shunts. Each out-

Channels

put is selectively programmable for clickless or regular

mode operation. A set of internal resistive voltage- 4Ω Typical On-Resistance Flatness

dividers supplies DC bias for each output when using

0.014% Total Harmonic Distortion with 1kΩ Load

AC-coupled inputs. Additionally, four auxiliary outputs

control additional circuitry via the MAX4550/MAX4570’s -110d B Off-Isolation at 20k Hz

2-wire or 3-wire interface. -78d B Off-Isolation at 4MHz The MAX4550/MAX4570 feature 80Ω on-resistance, 10Ω

-95d B Crosstalk at 20k Hz

on-resistance matching between channels, 5Ω on-

-54d B Crosstalk at 4MHz

resistance flatness, and 0.014% total harmonic distor-

tion. Additionally, they feature off-isolation of at least Serial Interface

-110d B in the audio frequency range and -78d B at 2-Wire, Fast-Mode, I2C-Compatible (MAX4550) 4MHz, with -95d B crosstalk in the audio frequency 3-Wire, SPI/QSPI/MICROWIRE-Compatible range and -54d B at 4MHz. The MAX4550 uses a 2-wire (MAX4570) I2C-compatible serial interface, while the MAX4570

Four Auxiliary Outputs that Extend µP Ports

uses a 3-wire SPI™/QSPI™ or MICROWIRE™-compati- ble serial interface. These parts are available in 28-pin Single-Supply Operation: +2.7V to +5.5V SSOP and wide SO packages and are tested over

Dual-Supply Operation: ±2.7V to ±5.5V

either the commercial (0°C to +70°C) or extended (-40°C to +85°C) operating temperature range.

Pin Configuration

Applications

TOP VIEW

Set-Top Boxes

SB SA

PC Multimedia Boards

NO3A NO2B

High-End Audio Systems

NO3B NO2A

Video Conferencing Systems

BIASH V-

BIASL V+

Ordering Information

MAX4550

NO4A NO1B

MAX4570

PART TEMP. RANGE PIN-PACKAGE

NO4B NO1A

MAX4550CAI 0°C to +70°C 28 SSOP

V+ GND

MAX4550CWI 0°C to +70°C 28 Wide SO

COM2A COM1A

MAX4550EAI -40°C to +85°C 28 SSOP

MAX4550EWI -40°C to +85°C 28 Wide SO Q0 Q3

MAX4570CAI 0°C to +70°C 28 SSOP COM2B COM1B MAX4570CWI 0°C to +70°C 28 Wide SO Q1 Q2 MAX4570EAI -40°C to +85°C 28 SSOP

A0 (CS) A1 (DOUT)

MAX4570EWI -40°C to +85°C 28 Wide SO

SCL (SCLK) SDA (DIN)

SO/SSOP

I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. ( ) ARE FOR MAX4570. MICROWIRE is a trademark of National Semiconductor Corp.

Functional Diagram appears at end of data sheet.

Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.