DG540 Datasheet, PDF (7/10 Pages) TEMIC Semiconductors – Wideband/Video T Switches

DG540/541/542
Test Circuits
+15 V
V+
3V
S
D
3V
Logic
V_O ^Input
IN
GND
V–
R_L
1 kW
C_L
35 pF
Switch
Input
V_S
Switch
Output
0
–3 V
C_L (includes fixture and stray capacitance)
V_O = V_S
R_L
R_L + r_DS(on)
Figure 2. Switching Time
50%
90%
t_ON
t_r <20 ns
t_f <20 ns
t_OFF
R_g
V_g
3V
+15 V
V+
S
D
IN
GND
V–
–3 V
V_O
C_L
1000 pF
DV_O
V_O
IN_X ON
OFF
ON
DV_O = measured voltage error due to charge injection
The charge injection in coulombs is DQ = C_L x DV_O
Figure 3. Charge Injection
+15 V
C
V_S
R_g = 75 W
0 V, 2.4 V
V+
S
D
IN
GND
V–
C
V_O
R_L
75 W
–3 V
V_S
Off Isolation = 20 log
C = RF Bypass
V_O
Figure 4. Off Isolation
Siliconix
S-53694—Rev. E, 28-May-97
+15 V
C
V_S
R_g = 50 W
0 V, 2.4 V
V+
S
D
IN
GND
V–
C
V_O
R_L
50 W
–3 V
Figure 5. Bandwidth
7