DG201A_MIL/202_MIL
Vishay Siliconix
APPLICATIONS
+15 V
160
120
80
V
1
C
C
4
f
150 pF
3
C4
Select
f
C3
1500 pF
Select
C
2
TTL
Control
0.015 mF
f
C1
f
C2
f
C3
f
C4
f
C2
40
Select
C
1
0.15 mF
f
C1
f
L1
f
L2
f
L3
f
L4
Select
0
DG201A_MIL
GND
V–
–40
1
10
100
1 k
10 k
100 k
1 M
–15 V
+15 V
f – Frequency (Hz)
R
= 1 MW
3
R
R
3
A
(Voltage Gain Below Break Frequency) =
= 100 (40 dB)
L
–15 V
–
1
V
OUT
1
R
1
= 10 kW
f
(Break Frequency) =
C
LM101A
2pR C
3
X
1
+
f
L
(Unity Gain Frequency) =
2pR C
1
X
r
DS(on)
R
2
= 10 kW
[–47 dB
30 pF
Max Attenuation =
10 kW
FIGURE 7. Active Low Pass Filter with Digitally Selected Break Frequency
+5 V
+15 V
V+
30 pF
+15 V
V
L
V
V
IN1
+
LM101A
IN2
–
+15 V
R
18 kW
R
R
F1
100 kW
DG419
F1
F1
9.9 kW
–15 V
DG202_MIL
CH
GND
V–
–15 V
R
2 kW
R
100 W
R
G3
100 W
G1
G2
Gain 1 (x1)
R
F
+ R
G
Gain =
Gain 2 (x10)
Gain 3 (x100)
Gain 4 (x1000)
R
G
V–
GND
Logic High = Switch On
–15 V
FIGURE 8. A Precision Amplifier with Digitally Programable Input and Gains
Document Number: 70036
S-00405—Rev. G, 21-Feb-00
www.vishay.com S FaxBack 408-970-5600
4-8
VISHAY [ VISHAY ]
