X9258 Datasheet, PDF (18/22 Pages) Xicor Inc. – Quad Digital Controlled Potentiometers (XDCP)

X9258
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
Filter
C
V_S
+
–
V_O
R
R₂
R₁
G_O = 1 + R₂/R₁
fc = 1/(2pRC)
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
REV 1.1.7 2/4/03
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Characteristics subject to change without notice. 18 of 22