MAX4666 Maxim, MAX4666 Datasheet - Page 8

• Manufacturer Part Number: MAX4666
• Description: The MAX4664/MAX4665/MAX4666 quad analog switches feature 5Ω max on-resistance
• Manufacturer: Maxim

5 Ω , Quad, SPST,
CMOS Analog Switches
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.
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,
8
3,14, 11, 6
MAX4664
1, 16, 9, 8
2, 15,
_______________________________________________________________________________________
10, 7
12
13
4
5
–
–
–
Off-Isolation at High Frequencies
3,14, 11, 6
MAX4665
1, 16, 9, 8
2, 15,
10, 7
Applications Information
PIN
12
13
–
–
–
4
5
MAX4666
1, 16, 9, 8
Overvoltage Protection
14, 11
2, 15,
10, 7
3, 6
12
13
–
–
4
5
COM1, COM2,
COM3, COM4
NC1, NC2,
NO1, NO2,
NC3, NC4
NO3, NO4
NO1, NO4
NC2, NC3
IN1, IN2,
IN3, IN4
NAME
GND
V+
V
V-
L
Logic-Control Digital Inputs
Analog Switch, Common Terminals
Analog Switch, Normally Closed Terminals
Analog Switch, Normally Open Terminals
Analog Switch, Normally Open Terminal
Analog Switch, Normally Closed Terminal
Negative Analog Supply-Voltage Input. Connect to GND for single-
supply operation.
Ground
Logic-Supply Input
Positive Analog Supply Input
the switch actually passes more signal turned off than
turned on.) This effect is more pronounced with higher
source and load impedances.
Figure 1. Overvoltage Protection Using External Blocking
Diodes
COM_
FUNCTION
*
*
V-
V+
-15V
+15V
D1
D2
* INTERNAL PROTECTION DIODES
*
*
Pin Description
MAX4664
MAX4665
MAX4666
NO_