X9271_14 Datasheet, PDF (17/18 Pages) Intersil Corporation – Single, Digitally Controlled Potentiometer

Application Circuits (Continued)
X9271
R₁
R₂
–
V_S
+
V_O
R₃
R_{4 R1 = R2 = R3 = R4 = 10k}
V_O = G V_S
-1/2  G  +1/2
FIGURE 11. ATTENUATOR
C
V_S
R
+
–
V_O
R₂
R₁
G_O = 1 + R₂/R₁
fc = 1/(2RC)
FIGURE 12. FILTER
R₁ R₂
V_S
–
+
V_O = G V_S
G = - R₂/R₁
FIGURE 13. INVERTING AMPLIFIER
–
+
V_O
R₂
} ^RA
} ^RB
C₁
V_S
Z_IN
R₂
+
–
R₁
R₃
Z_IN = R₂ + s R₂ (R₁ + R₃) C₁ = R₂ + s Leq
(R₁ + R₃) >> R₂
FIGURE 14. EQUIVALENT L-R CIRCUIT
C
R₁
–
+
Frequency  R₁, R₂, C
Amplitude  R_A, R_B
FIGURE 15. FUNCTION GENERATOR
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FN8174.4
July 18, 2014