X9271_14 Datasheet, PDF (3/18 Pages) Intersil Corporation – Single, Digitally Controlled Potentiometer

Detailed Functional Diagram
V_CC
X9271
HOLD
CS
SCK
SO
SI
A0
A1
WP
Interface
and
Control
Circuitry
D ATA
Bank 0 Power-on Recall
R₀ R₁
R₂ R₃
Wiper
Counter
Register
(WCR)
50kΩ
256 Taps
R_H
R_L
R_W
Bank 1
R₀ R₁
Bank 2
R₀ R₁
Bank 3
R₀ R₁
Control
R₂ R₃ R₂ R₃
R₂ R₃
12 Additional Nonvolatile Registers
3 Banks of 4 Registers x 8 Bits
V_SS
Circuit-Level Applications
• Vary the gain of a voltage amplifier.
• Provide programmable DC reference voltages for
comparators and detectors.
• Control the volume in audio circuits.
• Trim out the offset voltage error in a voltage amplifier
circuit.
• Set the output voltage of a voltage regulator.
• Trim the resistance in Wheatstone bridge circuits.
• Control the gain, characteristic frequency, and
Q-factor in filter circuits.
• Set the scale factor and zero point in sensor signal
conditioning circuits.
• Vary the frequency and duty cycle of timer ICs.
• Vary the DC biasing of a pin diode attenuator in RF
circuits.
• Provide a control variable (I, V, or R) in feedback
circuits.
System-Level Applications
• Adjust the contrast in LCD displays.
• Control the power level of LED transmitters in
communication systems.
• Set and regulate the DC biasing point in an RF power
amplifier in wireless systems.
• Control the gain in audio and home entertainment
systems.
• Provide the variable DC bias for tuners in RF
wireless systems.
• Set the operating points in temperature control
systems.
• Control the operating point for sensors in industrial
systems.
• Trim offset and gain errors in artificial intelligence
systems.
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FN8174.4
July 18, 2014