X9269
DETAILED FUNCTIONAL DIAGRAM
R
H0
R
L0
R
W0
V
CC
Power-on
Recall
R
0
R
1
Wiper
Counter
Register
(WCR)
Pot 0
SCL
SDA
A3
A2
A1
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
R
2
R
3
50kΩ and 100kΩ
256-taps
8
Data
Power-on
Recall
R
0
R
1
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
R
2
R
3
V
SS
R
L1
R
H1
R
W1
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
FN8173.4
April 17, 2007
INTERSIL [ INTERSIL CORPORATION ]
