Datasheet

MAX4644
High-Speed, Low-Voltage, 4 Ω ,
SPDT CMOS Analog Switch
_______________________________________________________________________________________ 9
Figure 5. NO, NC, and COM Capacitance
MEASUREMENTS ARE STANDARDIZED AGAINST
SHORT AT SOCKET TERMINALS. OFF-ISOLATION IS
MEASURED BETWEEN COM AND “OFF” TERMINAL
ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN
COM AND “ON” TERMINAL ON EACH SWITCH. SIGNAL
DIRECTION THROUGH SWITCH IS REVERSED; WORST
VALUES ARE RECORDED.
V+
V+
V
OUT
GND
V+
IN
NO
OR
NC
COM
V
IN
MAX4644
OFF-ISOLATION = 20log
V
OUT
V
IN
ON-LOSS = 20log
V
OUT
V
IN
NETWORK
ANALYZER
50Ω
50Ω 50Ω
50Ω
MEAS REF
0.1μF
50Ω
Figure 3. Off-Isolation and On-Loss
ΔV
OUT
V+
0
V
IN
V
OUT
ΔV
OUT
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ΔV
OUT
x C
L
V+
V
OUT
GND
V+
IN
NO
OR
NC
COM
V
NO
OR V
NC
= 0V
50Ω
MAX4644
C
L
1000pF
V
IN
V+
GND
V+
IN
NO
OR
NC
COM
MAX4644
AS
REQUIRED
1MHz
CAPACITANCE
ANALYZER
Figure 4. Charge Injection