X9401_06 Datasheet, PDF (17/19 Pages) Intersil Corporation – Quad, 64 Tap, Digitally Controlled Potentiometer

Application Circuits (continued)
INVERTING AMPLIFIER
R₁ R₂
V_S
–
+
V_O = G V_S
G = - R₂/R₁
X9401
EQUIVALENT L-R CIRCUIT
C₁
R₂
V_O
V_S
+
–
R₁
Z_IN
R₃
Z_IN = R₂ + s R₂ (R₁ + R₃) C₁ = R₂ + s Leq
(R₁ + R₃) >> R₂
FUNCTION GENERATOR
C
–
R₂
R₁
–
+
} ^RA
+
} ^RB
frequency ∝ R₁, R₂, C
amplitude ∝ R_A, R_B
17
FN8190.3
October 12, 2006