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X9119_14 Datasheet, PDF (16/17 Pages) Intersil Corporation – Single Digitally-Controlled Potentiometer
◁
Application Circuits (Continued)
ATTENUATOR
R1
R2
–
VS
+
VO
R3
R4
R1 = R2 = R3 = R4 = 10kΩ
VO = G VS
-1/2 £ G £ +1/2
X9119
FILTER
C
VS
+
–
VO
R
R2
R1
GO = 1 + R2/R1
fc = 1/(2pRC)
INVERTING AMPLIFIER
R1
R2
VS
–
+
VO
VO = G VS
G = - R2/R1
EQUIVALENT L-R CIRCUIT
C1
VS
ZIN
R2
+
–
R1
R3
ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq
(R1 + R3) >> R2
FUNCTION GENERATOR
–
R2
R1
+
} RA
} RB
C
–
+
FREQUENCY µ R1, R2, C
AMPLITUDE µ RA, RB
16
FN8162.4
July 9, 2008
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