MAX4740 Maxim, MAX4740 Datasheet - Page 6

• Manufacturer Part Number: MAX4740
• Description: The MAX4740/MAX4740H low on-resistance (0
• Manufacturer: Maxim

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).
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 signals that range over the entire supply voltage
range (V
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
EP
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
CC
to GND) can be passed with very little
Applications Information
NAME
COM2
COM3
COM4
COM1
GND
NC1
NO2
NC2
NO3
NC3
NO4
NC4
NO1
CB1
CB2
V
EP
CC
Detailed Description
Analog Switch 1—Normally Closed Terminal
Digital Control Input for Analog Switch 1 and Analog Switch 2
Analog Switch 2—Normally Open Terminal
Analog Switch 2—Common Terminal
Analog Switch 2—Normally Closed Terminal
Ground
Analog Switch 3—Normally Open Terminal
Analog Switch 3—Common Terminal
Analog Switch 3—Normally Closed Terminal
Digital Control Input for Analog Switch 3 and Analog Switch 4
Analog Switch 4—Normally Open Terminal
Analog Switch 4—Common Terminal
Analog Switch 4—Normally Closed Terminal
Positive Supply Voltage
Analog Switch 1—Normally Open Terminal
Analog Switch 1—Common Terminal
Exposed Pad. Connect to GND or leave unconnected for normal operation.
Analog Signal Levels
Table 1. MAX4740 Truth Table
Table 2. MAX4740H Truth Table
CB2
CB2
0
0
1
1
0
0
1
1
FUNCTION
CONTROL
CONTROL
CB1
CB1
0
1
0
1
0
1
0
1
COM = NO
COM = NO
COM = NO
COM = NO
COM = NC
COM = NC
COM = NC
Switch 3/4
Switch 3/4
High-Z
Pin Description
SWITCH STATE
SWITCH STATE
COM = NO
COM = NC
COM = NO
COM = NC
COM = NO
COM = NC
COM = NC
Switch 1/2
Switch 1/2
High-Z