X9259 Datasheet, PDF (2/25 Pages) Xicor Inc. – Quad Digitally-Controlled (XDCP) Potentiometers

X9259
DETAILED FUNCTIONAL DIAGRAM
SCL
SDA
A3
A2
A1
A0
WP
V_CC
INTERFACE
AND
CONTROL
CIRCUITRY
8
Data
R_H0 R_L0 R_W0
Power On
Recall
DR0 DR1
DR2 DR3
Wiper
Counter
Register
(WCR)
Pot 0
Power On
Recall
DR0 DR1
DR2 DR3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
Power On
Recall
DR0 DR1
DR2 DR3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
50KΩ and 100KΩ
256-taps
Power On
Recall
DR0 DR1
DR2 DR3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 3
V_SS
R_L1 R_H1 R_W1
R_H2
R_L2
R_W2
R_W3
R_H3
R_L3
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
REV 1.2.3 4/30/02
www.xicor.com
Characteristics subject to change without notice. 2 of 25