MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
_______________________________________________________________________________________ 9
Pin Description
Shunt Input to Crosspoint B. Use for shunt capacitor or AC ground connection to
improve off-isolation, or as an additional input to switch matrix B.
11
Input 3 to Crosspoint A22
Input 3 to Crosspoint B33
NO3A
NO3B
SB
Low Side of Bias Network. Use to give the outputs a DC bias when inputs are
AC-coupled (refer to the
Using the Internal Bias Resistors
section).
55
Input 4 to Crosspoint A66
BIASL
NO4A
BIASH
High Side of Bias Network. Use to give the outputs a DC bias when inputs are
AC-coupled (refer to the
Using the Internal Bias Resistors
section).
44
Positive Supply Voltage. Supply range is +2.7V to +5.25V. Connect pin 8 to pin 24 exter-
nally.
8, 248, 24
Output 2 of Crosspoint A99
V+
COM2A
NO4B
Output 2 of Crosspoint B1111
Auxiliary Output 11212
COM2B
Q1
Q0 Auxiliary Output 01010
Input 4 to Crosspoint B77
Chip Select of 3-Wire Interface. Logic low on CS enables serial data to be clocked in to
device. Programming commands are executed on CS’s rising edge.
13—
2-Wire Serial-Interface Clock Input —14
CS
SCL
A0
2-Wire Serial-Interface Data Input. Data is clocked in on SCL’s rising edge.—15
3-Wire Serial-Interface Data Input. Data is clocked in on SCLK’s rising edge.15—
SDA
DIN
SCLK 3-Wire Serial-Interface Clock Input14—
Data Output of 3-Wire Interface. Input data is clocked out and SCLK’s falling edge
delayed by 16 clock cycles. DOUT remains active when CS is high.
16—
Auxiliary Output 21717
DOUT
Q2
A1
Auxiliary Output 3
LSB+1 of 2-Wire Serial-Interface Address Field—13
1919
Output 1 of Crosspoint A2020
Q3
COM1A
COM1B Output 1 of Crosspoint A1818
LSB+2 of 2-Wire Serial-Interface Address Field—16
Ground2121 GND
Input 1 to Crosspoint A2222 NO1A
Input 1 to Crosspoint B2323 NO1B
Negative Supply Voltage. Supply range is from -5.25V to 0.2525 V-
Input 2 to Crosspoint A2626 NO2A
Input 2 to Crosspoint B2727 NO2B
Shunt Input to Crosspoint A. Use for shunt capacitor or AC ground connection to
improve off-isolation, or as an additional input to switch matrix A.
2828 SA
MAX4550
FUNCTION
MAX4570
NAME
PIN
