DG444B Datasheet, PDF (7/7 Pages) Vishay Siliconix – Improved Quad SPST CMOS Analog Switches

APPLICATIONS
New Product
DG444B/445B
Vishay Siliconix
V_IN
GAIN₁
A_V = 1
GAIN₂
A_V = 10
GAIN₃
A_V = 20
GAIN₄
A_V = 100
+
−
+5V
V_L
+15 V
V+
DG444B or DG445B
V−
GND
−15 V
V_OUT
Gain error is determined only by the resistor
tolerance. Op amp offset and CMRR will limit ac-
curacy of circuit.
R₁
90 kW
R₂
5 kW
R₃
4 kW
With SW₄ Closed:
V_{OUT =}
V_IN
R₁ + R₂ + R₃ + R₄
R₄
= 100
R₄
1 kW
FIGURE 8. Precision-Weighted Resistor Programmable-Gain Amplifier
+15 V
−15 V
−
V_IN
+
5 MW
30 pF
5.1 MW
+5 V
V₁
+15 V
DG444B
V₂
−15 V
GND
Logic Input
Low = Sample
High = Hold
+15 V
C₁
50 pF
C₂
1000 pF
J202
R₁
200 kW
J500
2N4400
J507
V_OUT
Document Number: 72626
S-32554—Rev. A, 15-Dec-03
FIGURE 9. Precision Sample-and-Hold
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