SGM48753
CMOS Analog Switch
TEST CIRCUITS (continued)
VCC
VCC
CHANNEL
SELECT
VCC
0V
X_,Y_,Z_
A,B,C
VENABLE
SGM48753
VENABLE
VOUT
ENABLE
ΔVOUT
X,Y,Z
VOUT
GND
CL=1000pF
50Ω
ΔVOUT IS THE MEASURED VOLTAGE DUE TO CHARGE
TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ΔVOUT × CL
Test Circuit 4. Charge Injection (Q)
10n
F
VCC
NETWORK
ANALYZER
VIN
50Ω
50Ω
VCC
X_,Y_,Z_
CHANNEL
SELECT
A,B,C
OFF-ISOLATION = 20log (VOUT/VIN)
ON-LOSS = 20log (VOUT/VIN)
SGM48753
VOUT
MEAS.
REF.
CROSSTALK = 20log (VOUT/VIN)
ENABLE
GND
X,Y,Z
50Ω
50Ω
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM AND "OFF" NO TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM AND "ON" NO TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL (A, B, C) TO ALL OTHER CHANNELS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
Test Circuit 5. Off Isolation, On Loss and Crosstalk
VCC
VCC
CHANNEL
SELECT
X_,Y_,Z_
X,Y,Z
A,B,C
SGM48753
1MHz
CAPACITANCE
ANALYZER
ENABLE
GND
Test Circuit 6. Capacitance
SG Micro Corp
www.sg-micro.com
DECEMBER 2014
9
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
