MAX4740/MAX4740H
Detailed Description
The MAX4740/MAX4740H quad SPDT audio switches
are low on-resistance, low supply current, high power-
supply rejection ratio (PSRR) devices that operate from
a +1.6V to +5.5V single supply. The MAX4740/
MAX4740H have two digital control inputs, CB1 and
CB2, where each bit controls a pair of switches (see
Tables 1 and 2).
Applications Information
The MAX4740/MAX4740H logic inputs accept up to
+5.5V, regardless of supply voltage. For example with a
+3.3V supply, CB1 and CB2 can be driven low to GND
and high to +5.5V, allowing for mixed logic levels in a
system. Driving CB1 and CB2 rail-to-rail minimizes
power consumption. For a 3.3V supply voltage, the
logic thresholds are +0.5V (low) and +1.6V (high).
Analog Signal Levels
Analog signals that range over the entire supply voltage
range (V
CC
to GND) can be passed with very little
change in on-resistance (see the
Typical Operating
Characteristics
). The switches are bidirectional, so the
NO_, NC_, and COM_ terminals can be used as either
inputs or outputs.
Quad SPDT Audio Switches
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 NC1 Analog Switch 1—Normally Closed Terminal
2 CB1 Digital Control Input for Analog Switch 1 and Analog Switch 2
3 NO2 Analog Switch 2—Normally Open Terminal
4 COM2 Analog Switch 2—Common Terminal
5 NC2 Analog Switch 2—Normally Closed Terminal
6 GND Ground
7 NO3 Analog Switch 3—Normally Open Terminal
8 COM3 Analog Switch 3—Common Terminal
9 NC3 Analog Switch 3—Normally Closed Terminal
10 CB2 Digital Control Input for Analog Switch 3 and Analog Switch 4
11 NO4 Analog Switch 4—Normally Open Terminal
12 COM4 Analog Switch 4—Common Terminal
13 NC4 Analog Switch 4—Normally Closed Terminal
14 V
CC
Positive Supply Voltage
15 NO1 Analog Switch 1—Normally Open Terminal
16 COM1 Analog Switch 1—Common Terminal
EP EP Exposed Pad. Connect to GND or leave unconnected for normal operation.
