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X9269_07 Datasheet, PDF (3/24 Pages) Intersil Corporation – Dual Digitally-Controlled Potentiometers | |||
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DETAILED FUNCTIONAL DIAGRAM
X9269
SCL
SDA
A3
A2
A1
A0
WP
VCC
INTERFACE
AND
CONTROL
CIRCUITRY
8
Data
RH0 RL0RW0
Power-on
Recall
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Pot 0
50kΩ and 100kΩ
256-taps
Power-on
Recall
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
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
RL1 RH1 RW1
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
FN8173.4
April 17, 2007
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