X9118_14 Datasheet, PDF (2/17 Pages) Intersil Corporation – Single Digitally-Controlled Potentiometer

Functional Diagram
X9118
V_CC
R_H
V+
2-WIRE
BUS
INTERFACE
ADDRESS
DATA
STATUS
BUS
INTERFACE
AND
CONTROL
WRITE
READ
TRANSFER
CONTROL
POWER ON RECALL
WIPER COUNTER
REGISTER (WCR)
DATA REGISTERS
(DR0-DR3)
WIPER
100kΩ
1024-TAPS
POT
V_SS
Detailed Functional Diagram
V_CC
NC
NC
R_W
R_L
V-
V+
SCL
SDA
A1
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
DATA
CONTROL
POWER ON
RECALL
DR0 DR1
DR2 DR3
WIPER
COUNTER
REGISTER
(WCR)
R_H
100KΩ
1024-TAPS
R_L
R_W
V_SS
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
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2
V-
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
FN8161.5
April 9, 2014