Datasheet

MAX4664/MAX4665/MAX4666
5 Ω , Quad, SPST,
CMOS Analog Switches
8 _______________________________________________________________________________________
Applications Information
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO, or COM. If power-supply sequencing
is not possible, add two small signal diodes (D1, D2) in
series with supply pins (Figure 1). Adding diodes
reduces the analog signal range to one diode drop
below V+ and one diode drop above V-, but does not
affect the devices’ low switch resistance and low leak-
age characteristics. Device operation is unchanged,
and the difference between V+ and V- should not
exceed 44V. These protection diodes are not recom-
mended when using a single supply.
Off-Isolation at High Frequencies
In 50Ω systems, the high-frequency on-response of
these parts extends from DC to above 100MHz, with a
typical loss of -2dB. When the switch is turned off, how-
ever, it behaves like a capacitor, and off-isolation
decreases with increasing frequency. (Above 300MHz,
the switch actually passes more signal turned off than
turned on.) This effect is more pronounced with higher
source and load impedances.
COM_
V-
V+
NO_
* INTERNAL PROTECTION DIODES
D2
D1
-15V
+15V
MAX4664
MAX4665
MAX4666
*
*
*
*
Figure 1. Overvoltage Protection Using External Blocking
Diodes
NAME FUNCTION
MAX4664
1, 16, 9, 8
IN1, IN2,
IN3, IN4
Logic-Control Digital Inputs
PIN
2, 15,
10, 7
COM1, COM2,
COM3, COM4
Analog Switch, Common Terminals
3,14, 11, 6
NC1, NC2,
NC3, NC4
Analog Switch, Normally Closed Terminals
4 V-
Negative Analog Supply-Voltage Input. Connect to GND for single-
supply operation.
– NC2, NC3 Analog Switch, Normally Closed Terminal
– NO1, NO4 Analog Switch, Normally Open Terminal
–
NO1, NO2,
NO3, NO4
Analog Switch, Normally Open Terminals
13 V+ Positive Analog Supply Input
12 V
L
Logic-Supply Input
5 GND Ground
MAX4665
1, 16, 9, 8
2, 15,
10, 7
–
4
–
–
3,14, 11, 6
13
12
5
MAX4666
1, 16, 9, 8
2, 15,
10, 7
–
4
14, 11
3, 6
–
13
12
5
Pin Description