DG211B/212B
Vishay Siliconix
APPLICATIONS
+5V
V
L
V+
+15 V
Logic Input
Low = Sample
High = Hold
1 kW
+15 V
–15 V
–
LM101A
V
IN
+
2N4400
5 MW
5.1 MW
V–
30 pF
–15 V
Aquisition Time
= 25
ms
Aperature Time
= 1
ms
Sample to Hold Offset
= 5 mV
Droop Rate
= 5 mV/s
–15 V
50 pF
200 W
1000 pF
J500
J507
V
OUT
J202
+15 V
DG211B
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
DG211B
GND
–40
1
10
100
1k
10 k
100 k
1M
–15 V
R
3
= 1 MW
+15 V
–
R
1
= 10 kW
LM101A
+
R
2
= 10 kW
30 pF
–15 V
V
OUT
Frequency – Hz
A
L
(Voltage Gain Below Break Frequency) =
1
f
C
(Break Frequency) =
2pR
3
C
X
f
L
(Unity Gain Frequency) =
Max Attenuation =
r
DS(on)
10 kW
1
2pR
1
C
X
[
–47 dB
R
3
R
1
= 100 (40 dB)
FIGURE 7.
Active Low Pass Filter with Digitally Selected Break Frequency
Document Number: 70040
S-00788—Rev. H, 24-Apr-00
www.vishay.com
S
FaxBack 408-970-5600
4-7
VISHAY [ VISHAY TELEFUNKEN ]
