X9438 Datasheet, PDF (15/18 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometer (XDCP) with Operational Amplifier

BASIC APPLICATIONS
I to V Converter
R₃
R₁
–
+
R₂
V_O
V_O/I_S = -R₃(1 + R₂/R₁) + R₂
X9438
Attenuator
R₁
R₂
–
V_S
+
V_O
R₃
R₄
R₁ = R₃ = R₄
R₂ = 2R₁
V_O = G V_S
-1/2 ≤ G ≤ +1/2
Absolute Value Amplifier with Gain
Phase Shifter
2R
R₁
R₁
V_S
V_S
–
R
R
R
R₁
+
V_O
–
+
–
+
V_O
C
R
A₁
A₂
V_O = |V_S|
R₁
R
V_O/V_S = 180° - 2tan^-1wRC
Function Generator
C
–
R₂
R₁
–
+
} ^RA
+
} ^RB
frequency ∝ R₁, R₂, C
amplitude ∝ R_A, R_B
15
FN8199.0
March 11, 2005