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X9251 Datasheet

Quad Digitally-Controlled Potentiometer

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DATASHEET
Single Supply/Low Power/256-Tap/SPI Bus, Quad
Digitally-Controlled (XDCP™) Potentiometer
X9251
The X9251 integrates four digitally controlled potentiometers
(XDCP) on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are implemented with
a combination of resistor elements and CMOS switches. The
position of the wipers are controlled by the user through the
SPI bus interface. Each potentiometer has associated with it a
volatile Wiper Counter Register (WCR) and four nonvolatile
Data Registers that can be directly written to and read by the
user. The content of the WCR controls the position of the wiper.
At power-up, the device recalls the content of the default Data
Registers of each DCP (DR00, DR10, DR20, and DR30) to the
corresponding WCR.
The XDCP can be used as a three terminal potentiometer or as
a two terminal variable resistor in a wide variety of
applications including control, parameter adjustments, and
signal processing.
Features
• Four potentiometers in one package
• 256 resistor taps–0.4% resolution
• SPI serial interface for write, read, and transfer operations of
the potentiometer
• Wiper resistance: 100Ω typical at VCC = 5V
• 4 Nonvolatile data registers for each potentiometer
• Nonvolatile storage of multiple wiper positions
• Standby current <5µA max
• VCC: 2.7V to 5.5V operation
• 50kΩ version of total resistance
• 100 year data retention
• Single supply version of X9250
• Endurance: 100,000 data changes per bit per register
• 24 Ld SOIC, 24 Ld TSSOP
• Low power CMOS
• Pb-free (RoHS compliant)
VCC
HOLD
A1
A0
SO
SI
SCK
CS
SPI
Interface
POWER UP,
INTERFACE
CONTROL
AND
STATUS
VSS
RH0
RH1
RH2
RH3
WCR0
DR00
DR01
DR02
DR03
DCP0
WCR1
DR10
DR11
DR12
DR13
DCP1
WCR2
DR20
DR21
DR22
DR23
DCP2
WCR3
DR30
DR31
DR32
DR33
DCP3
WP
RW0 RL0
RW1 RL1
FIGURE 1. FUNCTIONAL DIAGRAM
RW2 RL2
RW3 RL3
December 3, 2014
FN8166.6
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2005-2007, 2014. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

X9251 Datasheet

Quad Digitally-Controlled Potentiometer

No Preview Available !

X9251
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
Submit Document Feedback
2
FN8166.6
December 3, 2014


Part Number X9251
Description Quad Digitally-Controlled Potentiometer
Maker Intersil Corporation
Total Page 21 Pages
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