DG211B Datasheet, PDF (7/8 Pages) Vishay Siliconix – Improved Quad CMOS Analog Switches

APPLICATIONS
+15 V
–15 V
–
LM101A
V_IN
+
5 MW
5.1 MW
30 pF
Aquisition Time
= 25 ms
Aperature Time
= 1 ms
Sample to Hold Offset
= 5 mV
Droop Rate
= 5 mV/s
DG211B/212B
Vishay Siliconix
+5V
V_L
+15 V
V+
DG211B
V–
–15 V
1 kW
Logic Input
Low = Sample
High = Hold
+15 V
50 pF
J202
200 W
1000 pF
2N4400
J500
V_OUT
J507
–15 V
FIGURE 6. Sample-and-Hold
f_C4
Select
TTL
Control
f_C3
Select
f_C2
Select
f_C1
Select
C₄
150 pF
C₃
1500 pF
C₂
0.015 mF
C₁
0.15 mF
+15 V
V₁
V– ^DG211B GND
R₁ = 10 kW
R₂ = 10 kW
–15 V
R₃ = 1 MW
+15 V
–
LM101A
–15 V
+
30 pF
V_OUT
160
120
80
f_C1
40
f_C2 f_C3 f_C4
0
f_L1
f_L2
f_L3
f_L4
–40
1
10
100 1 k 10 k 100 k 1 M
Frequency – Hz
A_L (Voltage Gain Below Break Frequency) =
1
f_C (Break Frequency) = _2pR3CX
f_L (Unity Gain Frequency) =
Max Attenuation =
r_DS(on)
10 kW
1
2pR₁C_X
[ –47 dB
R₃
R₁ ^{= 100 (40 dB)}
Document Number: 70040
S-00788—Rev. H, 24-Apr-00
FIGURE 7. Active Low Pass Filter with Digitally Selected Break Frequency
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