X9279_09 Datasheet, PDF (17/18 Pages) Intersil Corporation – Single Digitally-Controlled (XDCP™) Potentiometer

Application Circuits (Continued)
R₁ R₂
V_S
–
+
X9279
C₁
V_S
R₂
+
–
R₁
Z_IN
V_O
R₃
V_O = G V_S
G = - R₂/R₁
INVERTING AMPLIFIER
Z_IN = R₂ + s R₂ (R₁ + R₃) C₁ = R₂ + s Leq
(R₁ + R₃) >> R₂
EQUIVALENT L-R CIRCUIT
–
R₂
R₁
+
} ^RA
} ^RB
Frequency ∝ R₁, R₂, C
Amplitude ∝ R_A, R_B
FUNCTION GENERATOR
C
–
+
17
FN8175.4
September 23, 2009