X9430 Datasheet, PDF (18/21 Pages) Xicor Inc. – Dual Digitally Controlled Potentiometer (XDCP™) with Operational Amplifier

Application Circuits (continued)
Attenuator
R₁
R₂
–
V_S
+
V_O
R₃
R_{4 All RS = 10kΩ}
V_O = G V_S
-1/2 ≤ G ≤ +1/2
Inverting Amplifier
R₁ R₂
V_S
–
+
V_O
V_O = G V_S
G = - R₂/R₁
X9430
Filter
C
V_S
+
–
V_O
R
R₂
R₁
G_O = 1 + R₂/R₁
fc = 1/(2πRC)
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
–
R₂
R₁
+
} ^RA
} ^RB
frequency µ R₁, R₂, C
amplitude µ R_A, R_B
C
–
+
18
FN8198.0
March 11, 2005