X9269 Potentiometers Datasheet

X9269 Datasheet, PDF, Equivalent


Part Number

X9269

Description

Dual Digitally-Controlled Potentiometers

Manufacture

Xicor

Total Page 25 Pages
Datasheet
Download X9269 Datasheet


X9269
APPLICATION NOTES AND DEVELOPMENT SYSTEM
AVAILABLE
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / 2-Wire bus
X9269
Dual Digitally-Controlled (XDCPTM) Potentiometers
FEATURES
• Dual–Two separate potentiometers
• 256 resistor taps/pot–0.4% resolution
• 2-Wire Serial Interface for write, read, and
transfer operations of the potentiometer single
supply device
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
• 50K, 100Kversions of End to End Pot
Resistance
• 100 yr. Data Retention
• Endurance: 100,000 Data Changes per Bit per
Register
• 24-Lead SOIC, 16-Lead CSP (Chip Scale Pack-
age), 24-Lead TSSOP
• Low Power CMOS
• Power Supply VCC = 2.7V to 5.5V
DESCRIPTION
The X9269 integrates 2 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
RH0
RH1
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
(DR0–DR3)
VSS
RW0 RL0 RW1 RL1
50Kor 100Kversions
REV 1.1.11 2/17/03
www.xicor.com
Characteristics subject to change without notice. 1 of 25

X9269
X9269
DETAILED FUNCTIONAL DIAGRAM
VCC
SCL
SDA
A3
A2
A1
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
8
Data
RH0 RL0 RW0
Power On
Recall
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Pot 0
50Kand 100K
256-taps
Power On
Recall
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
VSS RL1 RH1 RW1
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 1.1.11 2/17/03
www.xicor.com
Characteristics subject to change without notice. 2 of 25


Features APPLICATION NOTES AND DEVELOPMENT SYSTEM A V A I L A B L E AN99 • AN115 • A N124 •AN133 • AN134 • AN135 Sing le Supply / Low Power / 256-tap / 2-Wir e bus X9269 Dual Digitally-Controlled (XDCPTM) Potentiometers FEATURES • Du al–Two separate potentiometers • 25 6 resistor taps/pot–0.4% resolution 2-Wire Serial Interface for write, r ead, and transfer operations of the pot entiometer single supply device • Wip er Resistance, 100Ω typical VCC = 5V • 4 Nonvolatile Data Registers for Ea ch Potentiometer • Nonvolatile Storag e of Multiple Wiper Positions • Power On Recall. Loads Saved Wiper Position on Power Up. • Standby Current < 5µA Max • 50KΩ, 100KΩ versions of En d to End Pot Resistance • 100 yr. Dat a Retention • Endurance: 100,000 Data Changes per Bit per Register • 24-Le ad SOIC, 16-Lead CSP (Chip Scale Packag e), 24-Lead TSSOP • Low Power CMOS Power Supply VCC = 2.7V to 5.5V DESCR IPTION The X9269 integrates 2 digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit..
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