Datasheet

MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
______________________________________________________________________________________ 11
High-Frequency Performance
In 50Ω systems, signal response is reasonably flat up
to 30MHz (see Typical Operating Characteristics ).
Above 30MHz, the on-response has several minor
peaks that are highly layout dependent. The problem
with high-frequency operation is not turning the switch
on, but turning it off. The off-state switch acts like a
capacitor and passes higher frequencies with less
attenuation. At 10MHz, off-isolation is about -46dB in
50Ω systems, declining (approximately 20dB per
decade) as frequency increases. Higher circuit imped-
ance also diminishes off-isolation. Adjacent channel
attenuation is about 3dB above that of a bare IC socket
and is due entirely to capacitive coupling.
Test Circuits/Timing Diagrams
50% 50%
V+
0V
V
NO_
, V
NC_
V
OUT
V
IN_
0V
80%
t
OPEN
V+
V
OUT
V
IN_
GND V-
V-
R
L
V+
IN_
IN_
NO_
NC_
COM_
COM_
+10V
MAX4631
50Ω
10pF
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
t
R
< 5ns
t
F
< 5ns
Figure 3. MAX4631 Break-Before-Make Interval
50% 50%
t
ON
V+
0V
+10V
V
OUT
V
IN_
0V
90%
90%
t
OFF
V
IN_
V+
V
OUT
GND
V+
IN_
NO_ OR NC_
COM_
+10V
MAX4631
MAX4632
MAX4633
R
L
50Ω
10pF
V-
V-
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 2. Switch Turn-On/Turn-Off Times