Datasheet

Applications Information
Analog Signal Levels
Analog signals can range over the supply voltage (V+
to GND) with on-resistance changing very little over the
entire range (see Typical Operating Characteristics).
The MAX4599 is bidirectional, so the NO, NC, and
COM pins can be used either as inputs or outputs.
Power-Supply Sequencing and
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+ before applying
analog signals or logic inputs, especially if the analog
or logic signals are not current limited. If this sequenc-
ing is not possible, and if the analog or logic inputs are
not current limited to < 20mA, add a small-signal diode
(D1) as shown in Figure 1. If the analog signal can dip
below GND, add D2. Adding protection diodes
reduces the analog signal range to a diode drop (about
0.7V) below V+ for D1 or to a diode drop above ground
for D2. The addition of diodes does not affect leakage.
On-resistance increases by a small amount at low sup-
ply voltages. Maximum supply voltage (V+) must not
exceed 6V.
Protection diodes D1 and D2 also protect against some
overvoltage situations. A fault voltage up to the
absolute maximum rating at an analog signal input
does not damage the device, even if the supply voltage
is below the signal voltage.
MAX4599
Low-Voltage, Single-Supply,
SPDT Analog Switch in SC70
6 _______________________________________________________________________________________
-95
0.01 0.1 1 10 100 200
FREQUENCY RESPONSE
-75
MAX4599 toc10
FREQUENCY (MHz)
LOSS (dB)
-55
-35
-15
-25
-45
-65
-85
-5
ON-RESPONSE
OFF-ISOLATION
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
1
0.01
0.01 0.1 100110
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
0.1
MAX4599 toc11
FREQUENCY (kHz)
THD + N (%)
R
L
= 600Ω
V
IN
= 5V
P-P
V
IN
= 3V
P-P
NAME FUNCTION
1 IN Digital Control Input
2 V+ Positive Supply Voltage
PIN
3 GND Ground
4 NC Analog Switch Normally Closed
6 NO Analog Switch Normally Open
5 COM Analog Switch Common
Pin Description
POSITIVE SUPPLY
COM
NO
OR
NC
D2
D1
GND
V
g
V+
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes