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X9271_11 Datasheet, PDF (3/22 Pages) Intersil Corporation – Single, Digitally Controlled (XDCP™) Potentiometer | |||
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DETAILED FUNCTIONAL DIAGRAM
VCC
X9271
HOLD
CS
SCK
SO
SI
A0
A1
WP
Interface
and
Control
Circuitry
DATA
Bank 0 Power-on Recall
50kΩ and 100kΩ
256 Taps
R0 R1 Wiper
RH
Counter
Register
R2 R3 (WCR)
RL
RW
Bank 1 Bank 2
R0 R1 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
VSS
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.
3
FN8174.3
June 23, 2011
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