X9271_11 Datasheet, PDF (21/22 Pages) Intersil Corporation – Single, Digitally Controlled (XDCP™) Potentiometer

Application Circuits (continued)
Attenuator
X9271
V_S
R₁
R₂
–
V_S
+
V_O
R₃
R_{4 R1 = R2 = R3 = R4 = 10kΩ}
V_O = G V_S
-1/2 ≤ G ≤ +1/2
Filter
C
+
–
R
R₁
V_O
R₂
G_O = 1 + R₂/R₁
fc = 1/(2πRC)
Inverting Amplifier
R₁ R₂
V_S
–
+
V_O
V_O = G V_S
G = - R₂/R₁
Equivalent L-R Circuit
C₁
V_S
Z_IN
R₂
+
–
R₁
R₃
Function Generator
Z_IN = R₂ + s R₂ (R₁ + R₃) C₁ = R₂ + s Leq
(R₁ + R₃) >> R₂
C
–
R₂
R₁
–
+
} ^RA
+
} ^RB
Frequency ∝ R₁, R₂, C
Amplitude ∝ R_A, R_B
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21
FN8174.3
June 23, 2011