DG540_11 Datasheet, PDF (7/18 Pages) Vishay Siliconix – Wideband/Video 'T' Switches

TEST CIRCUITS
DG540, DG541, DG542
Vishay Siliconix
+ 15 V
V+
S
D
3V
3V
Logic
V_O
Input
IN
GND
V-
R_L
1 kΩ
C_L
35 pF
Switch
Input
V_S
-3V
C_L (includes fixture and stray capacitance)
V_O = V_S
R_L
R_L + r_DS(on)
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-
-3V
V_O
C_L
1000 pF
ΔV _O
V_O
IN_{X ON}
OFF
ON
Figure 3. Charge Injection
ΔV_O = measured voltage error due to charge injection
The charge injection in coulombs is ΔQ = C_L x DV_O
+ 15 V
C
V_S
R_g = 75 Ω
0 V, 2.4 V
V+
S
D
IN
GND
V-
C
V_O
R_L
75 Ω
-3V
V_S
Off Isolation = 20 log
C = RF Bypass
V_O
Figure 4. Off Isolation
+ 15 V
C
V_S
R_g = 50 Ω
0 V, 2.4 V
V+
S
D
IN
GND
V-
C
V_O
R_L
50 Ω
-3V
Figure 5. Bandwidth
Document Number: 70055
www.vishay.com
S11-1429–Rev. H, 18-Jul-11
7
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000