DG201B/202B
Vishay Siliconix
APPLICATIONS
+15 V
V+
Logic Input
Low = Sample
High = Hold
1 kW
+15 V
–15 V
–
LM101A
V
IN
+
5 MW
5.1 MW
V–
30 pF
J202
+15 V
2N4400
50 pF
200
W
1000 pF
J500
J507
–15 V
V
OUT
DG201B
Aquisition Time
Aperature Time
Sample to Hold Offset
Droop Rate
= 25
ms
= 1
ms
= 5 mV
= 5 mV/s
–15 V
FIGURE 6.
Sample-and-Hold
+15 V
160
C
4
f
C4
Select
f
C3
Select
TTL
Control
f
C2
Select
f
C1
Select
150 pF
C
3
Voltage Gain – dB
1500 pF
C
2
0.015
mF
C
1
0.15
mF
80
f
C1
40
f
C2
f
C3
f
C4
V
1
120
0
V–
f
L1
f
L2
f
L3
f
L4
DG201B
GND
–40
1
10
100
1k
10 k
100 k
1M
–15 V
+15 V
–
R
1
= 10 kW
LM101A
+
R
2
= 10 kW
30 pF
R
3
= 1 MW
f – Frequency (Hz)
R
3
R
1
–15 V
V
OUT
A
L
(Voltage Gain Below Break Frequency) =
1
f
C
(Break Frequency) =
2pR
3
C
X
f
L
(Unity Gain Frequency) =
r
DS(on)
Max Attenuation =
= 100 (40 dB)
1
2pR
1
C
X
–47 dB
10 kW
FIGURE 7.
Active Low Pass Filter with Digitally Selected Break Frequency
www.vishay.com
S
FaxBack 408-970-5600
4-8
Document Number: 70037
S-52433—Rev. G, 06-Sep-99
VISHAY [ VISHAY TELEFUNKEN ]
