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X9250_14 Datasheet, PDF (18/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers | |||
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Application Circuits (continued)
Attenuator
X9250
VS
R1
R2
â
VS
+
VO
R3
R4 R1 = R2 = R3 = R4 = 10kâ¦
Filter
C
+
â
R
R1
VO
R2
VO = G VS
-1/2 ⤠G ⤠+1/2
GO = 1 + R2/R1
fc = 1/(2ÏRC)
Inverting Amplifier
R1 R2
VS
â
+
VO
VO = G VS
G = - R2/R1
Equivalent L-R Circuit
C1
VS
ZIN
R2
+
â
R1
R3
ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq
(R1 + R3) >> R2
â
R2
R1
+
} RA
} RB
frequency â R1, R2, C
amplitude â RA, RB
C
â
+
18
FN8165.3
August 29, 2006
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