MAX4548 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches

19-1496; Rev 0; 6/99
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
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 35Ω max on-resis-
tance, 7Ω on-resistance matching between channels,
5Ω 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
uses a 2-wire I²C™-compatible serial interface, while
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
PART
MAX4548EAX
MAX4549EAX
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
36 SSOP
36 SSOP
Functional Diagram appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
I²C is a trademark of Philips Corp.
Features
o Selectable Soft-Switching Mode for “Clickless”
Audio Operation
o 22Ω Typical On-Resistance (+5V Supply)
o 5Ω Typical On-Resistance Matching Between
Channels
o 2Ω Typical On-Resistance Flatness
o Audio Performance
-85dB Off-Isolation at 20kHz
-85dB Crosstalk at 20kHz
0.07% THD with 600Ω Load
o Video Performance
-72dB Off-Isolation at 10MHz
-55dB Crosstalk at 10MHz
o Serial Interface
2-Wire I²C-Compatible (MAX4548)
3-Wire SPI/QSPI/MICROWIRE-Compatible
(MAX4549)
o Single-Supply Operation from +2.7V to +5.5V
Pin Configuration
TOP VIEW
NO1C 1
CBIASH 2
NO2C 3
SC 4
NO3C 5
V+ 6
NO1A 7
N01B 8
SA 9
NO2A 10
N02B 11
SB 12
N03A 13
N03B 14
GND 15
GND 16
SDA (DIN) 17
SCL (SCLK) 18
MAX4548
MAX4549
36 CBIASL
35 COM1C
34 MID5
33 COM2C
32 GND
31 COM1A
30 MID1
29 COM1B
28 MID2
27 COM2A
26 MID3
25 COM2B
24 MID4
23 ABIASH
22 ABIASL
21 V+
20 A0 (CS)
19 A1 (DOUT)
( ) ARE FOR MAX4549
SSOP
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