DG417_10 Datasheet, PDF (9/16 Pages) Vishay Siliconix – Precision CMOS Analog Switches

TEST CIRCUITS
DG417, DG418, DG419
Vishay Siliconix
+5V
+ 15 V
C
C
V_L
DG417/418
V+
S
0 V, 2.4 V IN
GND
D
V-
C
- 15 V
Meter
HP4192A
Impedance
Analyzer
or Equivalent
f = 1 MHz
+ 15 V NC
C
V+ ^S2
S₁
DG419
0 V, 2.4 V _IN
D₂
GND
D₁
V-
C
Figure 9. Source/Drain Capacitances
- 15 V
Meter
HP4192A
Impedance
Analyzer
or Equivalent
f = 1 MHz
APPLICATIONS
Switched Signal Powers Analog Switch
The analog switch in Figure 10 derives power from its input
signal, provided the input signal amplitude exceeds 4 V and
its frequency exceeds 1 kHz.
This circuit is useful when signals have to be routed to either
of two remote loads. Only three conductors are required: one
for the signal to be switched, one for the control signal and a
common return.
A positive input pulse turns on the clamping diode D₁ and
charges C₁. The charge stored on C₁ is used to power the
chip; operation is satisfactory because the switch requires
less than 1 µA of stand-by supply current. Loading of the
signal source is imperceptible. The DG419’s on-resistance is
a low 100  for a 5 V input signal.
D₁
Input
Control
V+
D
V_L
S₁
S₂
IN
DG419
GND
V-
C₁
0.01 µF
V_OUT
R_L1
10 k
R_L2
10 k
Figure 10. Switched Signal Powers Remote SPDT Analog Switch
Document Number: 70051
S10-1528-Rev. G, 19-Jul-10
www.vishay.com
9