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X9271 Datasheet, PDF (2/22 Pages) Xicor Inc. – 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
50k⦠and 100kâ¦
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 intelligent
systems
2
FN8174.1
March 31, 2005
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