MAX4550 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches

19-1397; Rev 0; 10/98
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Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
General Description
The MAX4550/MAX4570 serial-interface, programma-
ble, dual 4x2 audio/video crosspoint switches are ideal
for multimedia applications. Each device contains two
identical crosspoint switch arrays, each with four inputs
and two outputs. To improve off-isolation, use the addi-
tional crosspoint inputs SA and SB as shunts. Each out-
put is selectively programmable for clickless or regular
mode operation. A set of internal resistive voltage-
dividers supplies DC bias for each output when using
AC-coupled inputs. Additionally, four auxiliary outputs
control additional circuitry via the MAX4550/MAX4570’s
2-wire or 3-wire interface.
The MAX4550/MAX4570 feature 80Ω on-resistance, 10Ω
on-resistance matching between channels, 5Ω on-
resistance flatness, and 0.014% total harmonic distor-
tion. Additionally, they feature off-isolation of at least
-110dB in the audio frequency range and -78dB at
4MHz, with -95dB crosstalk in the audio frequency
range and -54dB at 4MHz. The MAX4550 uses a 2-wire
I²C-compatible serial interface, while the MAX4570
uses a 3-wire SPI™/QSPI™ or MICROWIRE™-compati-
ble serial interface. These parts are available in 28-pin
SSOP and wide SO packages and are tested over
either the commercial (0°C to +70°C) or extended
(-40°C to +85°C) operating temperature range.
Features
o Selectable Soft Switching Mode for Clickless
Audio Operation
o 43Ω Typical On-Resistance (±5V Supplies)
o 5Ω Typical On-Resistance Matching Between
Channels
o 4Ω Typical On-Resistance Flatness
o 0.014% Total Harmonic Distortion with 1kΩ Load
o -110dB Off-Isolation at 20kHz
-78dB Off-Isolation at 4MHz
o -95dB Crosstalk at 20kHz
-54dB Crosstalk at 4MHz
o Serial Interface
2-Wire, Fast-Mode, I²C-Compatible (MAX4550)
3-Wire, SPI/QSPI/MICROWIRE-Compatible
(MAX4570)
o Four Auxiliary Outputs that Extend µP Ports
o Single-Supply Operation: +2.7V to +5.5V
Dual-Supply Operation: ±2.7V to ±5.5V
Pin Configuration
Set-Top Boxes
PC Multimedia Boards
High-End Audio Systems
Video Conferencing Systems
Applications
PART
MAX4550CAI
MAX4550CWI
MAX4550EAI
MAX4550EWI
MAX4570CAI
MAX4570CWI
MAX4570EAI
MAX4570EWI
Ordering Information
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
TOP VIEW
SB 1
NO3A 2
NO3B 3
BIASH 4
BIASL 5
NO4A 6
NO4B 7
V+ 8
COM2A 9
Q0 10
COM2B 11
Q1 12
A0 (CS) 13
SCL (SCLK) 14
MAX4550
MAX4570
28 SA
27 NO2B
26 NO2A
25 V-
24 V+
23 NO1B
22 NO1A
21 GND
20 COM1A
19 Q3
18 COM1B
17 Q2
16 A1 (DOUT)
15 SDA (DIN)
I²C is a trademark of Philips Corp.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
SO/SSOP
( ) ARE FOR MAX4570.
Functional Diagram appears at end of data sheet.
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