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X9259 Datasheet Preview

X9259 Datasheet

Quad Digitally-Controlled (XDCP) Potentiometers

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APPLICATION NOTES AND DEVELOPMENT SYSTEM
AVAILABLE
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / 2-Wire bus
X9259
Quad Digitally-Controlled (XDCPTM) Potentiometers
FEATURES
• Quad–Four separate potentiometers
• 256 resistor taps/pot–0.4% resolution
• 2-Wire Serial Interface for write, read, and
transfer operations of the potentiometer
• Wiper Resistance, 100typical @ VCC = 5V
• 4 Nonvolatile Data Registers for Each
Potentiometer
• Nonvolatile Storage of Multiple Wiper Positions
• Power On Recall. Loads Saved Wiper Position on
Power Up.
• Standby Current < 5µA Max
• VCC: 2.7V to 5.5V Operation
• 50K, 100Kversions of End to End Pot
Resistance
• Endurance: 100,000 Data Changes per Bit per
Register
• 100 yr. Data Retention
• Single Supply Version of X9258
• 24-Lead SOIC, 24-Lead TSSOP, 24-Lead XBGA
• Low Power CMOS
DESCRIPTION
The X9259 integrates 4 digitally controlled
potentiometer (XDCP) on a monolithic CMOS
integrated circuit.
The digital controlled potentiometer is implemented
using 255 resistive elements in a series array. Between
each element are tap points connected to the wiper
terminal through switches. The position of the wiper on
the array is controlled by the user through the 2-Wire
bus interface. Each potentiometer has associated with
it a volatile Wiper Counter Register (WCR) and a four
nonvolatile Data Registers that can be directly written
to and read by the user. The contents of the WCR
controls the position of the wiper on the resistor array
though the switches. Powerup recalls the contents of
the default Data Register (DR0) to the 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.
FUNCTIONAL DIAGRAM
VCC
2-Wire
Bus
Interface
Address
Data
Status
Bus
Interface
and Control
Write
Read
Transfer
Inc/Dec
Control
Power On Recall
Wiper Counter
Registers (WCR)
Data Registers
16 Bytes
RH0
RH1
RH2
RH3
VSS
RW0
RL0 RW1 RL1 RW2
RL2 RW3
RL3
50Kor 100Kversions
REV 1.2.3 4/30/02
www.xicor.com
Characteristics subject to change without notice. 1 of 25




Xicor

X9259 Datasheet Preview

X9259 Datasheet

Quad Digitally-Controlled (XDCP) Potentiometers

No Preview Available !

X9259
DETAILED FUNCTIONAL DIAGRAM
SCL
SDA
A3
A2
A1
A0
WP
VCC
INTERFACE
AND
CONTROL
CIRCUITRY
8
Data
RH0 RL0 RW0
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
50Kand 100K
256-taps
Power On
Recall
DR0 DR1
DR2 DR3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 3
VSS RL1 RH1 RW1
RH2
RL2
RW2
RW3
RH3
RL3
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


Part Number X9259
Description Quad Digitally-Controlled (XDCP) Potentiometers
Maker Xicor
Total Page 25 Pages
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