X9251_14 Datasheet, PDF(18/21 Page) Intersil Corporation – Single Supply/Low Power/256-Tap/SPI Bus, Quad Digitally-Controlled Potentiometer

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X9251_14 Datasheet, PDF (18/21 Pages) Intersil Corporation – Single Supply/Low Power/256-Tap/SPI Bus, Quad Digitally-Controlled Potentiometer

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Application Circuits (continued)

ATTENUATOR

X9251

R1 = R2 = R3 = R4 = 10kÎ©

FILTER

VO = G VS

-1/2 ï£ G ï£ +1/2

GO = 1 + R2/R1

fc = 1/(2ï°RC)

INVERTING AMPLIFIER

VO = G VS

G = - R2/R1

FUNCTION GENERATOR

} RA

} RB

FREQUENCY ïµ R1, R2, C

AMPLITUDEï ïµ RA, RB

EQUIVALENT L-R CIRCUIT

ZIN

ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq

(R1 + R3) >> R2

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FN8166.6

December 3, 2014

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