X9418_06 Datasheet, PDF (17/20 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometers

Application Circuits (continued)
X9418
ATTENUATOR
R₁
R₂
–
V_S
+
V_O
R₃
R_{4 All RS = 10kΩ}
V_O = G V_S
-1/2 ≤ G ≤ +1/2
FILTER
C
V_S
+
–
V_O
R
R₂
R₁
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
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
FN8194.3
October 12, 2006