Datasheet

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SCDS180 − FEBRUARY 2005
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11
V
+
GND
IN
V
BIAS
V
I
V
I
= V
IH
or V
IL
V
BIAS
= V
+
or GND
Capacitance is measured at NC,
COM, and IN inputs during ON
and OFF conditions.
Capacitance
Meter
V
COM
V
NC
COM
NC
f = 1 MHz
Figure 16. Capacitance (C
I
, C
COM(OFF)
, C
COM(ON)
, C
NC(OFF)
, C
NC(ON)
)
C
L
(2)
R
L
V
COM
V
+
GND
NC
IN
V
NC
V
I
COM
Logic
Input
(1)
300 Ω
R
L
C
L
35 pFt
ON
TEST
300 Ω 35 pFt
OFF
50%
t
ON
t
OFF
50%
90% 90%
Logic
Input
(V
I
)
V
+
Switch
Output
(V
COM
)
0
(3)
(1)
All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z
O
= 50 Ω, t
r
< 5 ns, t
f
< 5 ns.
(2)
C
L
includes probe and jig capacitance.
(3)
See Electrical Characteristics for V
COM
.
Figure 17. Turn-On (t
ON
) and Turn-Off Time (t
OFF
)
V
+
GND
NC
IN
V
I
COM
50 W
50 W
V
NC
V
COM
Channel ON: NC to COM
Network Analyzer Setup
Source Power = 0 dBm
(632-mV P-P at 50-W load)
DC Bias = 350 mV
Network Analyzer
Source
Signal
+
V
I
= V
+
or GND
Figure 18. Bandwidth (BW)