DG540 Datasheet, PDF (7/11 Pages) TEMIC Semiconductors – Wideband/Video T Switches

DG540/541/542
Vishay Siliconix
TEST CIRCUITS
+15 V
V+
S
D
3V
IN
GND
V–
R_L
1 kW
V_O
C_L
35 pF
–3 V
C_L (includes fixture and stray capacitance)
V_O = V_S
R_L
R_L + r_DS(on)
3V
Logic
Input
Switch
Input
V_S
Switch
Output
0
FIGURE 2. Switching Time
50%
90%
t_ON
t_r <20 ns
t_f <20 ns
t_OFF
+15 V
V+
R_g
S
D
V_g
IN
3V
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
V_S
Off Isolation = 20 log
C = RF Bypass
V_O
–3 V
FIGURE 4. Off Isolation
Document Number: 70055
S-00399—Rev. G, 13-Sep-99
+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
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