DG411/412/413
Vishay Siliconix
TEST CIRCUITS
+5 V
C
V
L
V
S
R
g
= 50
W
0V, 2.4 V
IN
S
V+
+15 V
C
+5 V
V
O
C
V
L
R
L
50
W
+15 V
C
V+
D
S
Meter
GND
V–
C
0 V, 2.4 V
IN
–15 V
GND
Off Isolation = 20 log
C = RF Bypass
V
S
V
O
–15 V
V–
D
C
HP4192A
Impedance
Analyzer
or Equivalent
FIGURE 6.
Off Isolation
FIGURE 7.
Source/Drain Capacitances
APPLICATIONS
Single Supply Operation:
The DG411/412/413 can be operated with unipolar supplies
from 5 V to 44 V. These devices are characterized and tested
for unipolar supply operation at 12 V to facilitate the majority of
applications. In single supply operation, V+ is tied to V
L
and V–
is tied to 0 V. See Input Switching Threshold vs. Supply
Voltage curve for V
L
versus input threshold requirments.
Summing Amplifier
When driving a high impedance, high capacitance load such
as shown in Figure 8, where the inputs to the summing
amplifier have some noise filtering, it is necessary to have
shunt switches for rapid discharge of the filter capacitor, thus
preventing offsets from occurring at the output.
R
1
V
IN 1
R
2
C
1
R
5
R
3
V
IN 2
R
4
–
V
OUT
+
C
2
R
6
DG413
FIGURE 8.
Summing Amplifier
www.vishay.com
S
FaxBack 408-970-5600
Document Number: 70050
S-52433—Rev. D, 06-Sep-99
4-8
VISHAY [ VISHAY TELEFUNKEN ]
