X9279_09 Datasheet, PDF (3/18 Pages) Intersil Corporation – Single Digitally-Controlled (XDCP™) Potentiometer

Detailed Functional Diagram
V_CC
SCL
SDA
A3
A2
A1
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
D ATA
X9279
BANK 0 POWER-ON RECALL
DR0 DR1 _WIPER
COUNTER
REGISTER
DR2 DR3 ^(WCR)
R_H
50kΩ and 100kΩ
256-TAPS
R_L
R_W
BANK 1 BANK 2 _{BANK 3}
DR0 DR1 DR0 DR1 DR0 DR1
CONTROL
DR2 DR3 DR2 DR3 DR2 DR3
12 ADDITIONAL NON-VOLATILE REGISTERS
3 BANKS OF 4 REGISTERS x 8-BITS
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
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
FN8175.4
September 23, 2009