MAX4644 Maxim, MAX4644 Datasheet - Page 9

• Manufacturer Part Number: MAX4644
• Description: The MAX4644 is a single-pole/double-throw (SPDT) switch that operates from a single supply ranging from +1
• Manufacturer: Maxim

Figure 3. Off-Isolation and On-Loss
Figure 4. Charge Injection
V
OUT
V
IN
V
IN
ΔV
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ΔV
V+
0
OUT
50Ω
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
OUT
IN
x C
_______________________________________________________________________________________
L
MAX4644
V+
GND
V+
V+
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.
COM
NO
NC
OR
IN
MAX4644
V
GND
NO
C
1000pF
V+
V+
L
ΔV
OR V
V
High-Speed, Low-Voltage, 4 Ω ,
OUT
OUT
0.1μF
NC
COM
NO
NC
OR
= 0V
SPDT CMOS Analog Switch
50Ω
Figure 5. NO, NC, and COM Capacitance
REQUIRED
V
AS
OUT
V
IN
OFF-ISOLATION = 20log
MEAS
50Ω
IN
ON-LOSS = 20log
50Ω
ANALYZER
NETWORK
MAX4644
50Ω
GND
V+
V+
50Ω
REF
V
V
V
COM
OUT
V
OUT
IN
IN
NO
NC
OR
CAPACITANCE
ANALYZER
1MHz
9