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X9421 Datasheet, PDF (3/21 Pages) Xicor Inc. – Single Digitally Controlled (XDCP) Potentiometer | |||
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DETAILED FUNCTIONAL DIAGRAM
VCC
HOLD
CS
SCK
SO
SI
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
Control
DATA
VSS
X9421
Power-on Recall
DR0 DR1
WIPER
COUNTER
REGISTER
DR2 DR3 (WCR)
10kâ¦
64--taps
RH/VH
RL/VL
RW/VW
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 intelligent
systems
3
FN8196.1
September 23, 2005
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