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DATASHEET
X9268
Dual Supply/Low Power/256-Tap/2-Wire Bus Dual Digitally-Controlled (XDCP™)
Potentiometers
FN8172
Rev.4.00
August 29, 2006
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
Wiper Resistance, 100typical @ V+ = 5V,
V- = -5V
• 16 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
• 24 Ld SOIC
• Low Power CMOS
• Power Supply VCC = ±2.7V to ±5.5V
V+ = 2.7V to 5.5V
V- = -2.7V to -5.5V
• Pb-Free Plus Anneal Available (RoHS Compliant)
DESCRIPTION
The X9268 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
V+
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)
RH0
RH1
VSS
V- RW0 RL0 RW1 RL1
50kor 100kversions
FN8172 Rev.4.00
August 29, 2006
Page 1 of 22

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X9268
Ordering Information
PART NUMBER
X9268TS24
PART
MARKING
X9268TS
VCC LIMITS POTENTIOMETER TEMP. RANGE
(V) ORGANIZATION (k)
(°C)
PACKAGE
5 ±10%
100
0 to +70 24 Ld SOIC (300mil)
PKG.
DWG. #
M24.3
X9268TS24Z (Note)
X9268TS Z
0 to +70 24 Ld SOIC (300mil) (Pb-free) M24.3
X9268TS24I
X9268TS I
-40 to +85 24 Ld SOIC (300mil)
M24.3
X9268TS24IZ (Note) X9268TS ZI
-40 to +85 24 Ld SOIC (300mil) (Pb-free) M24.3
X9268US24
X9268US
50
0 to +70 24 Ld SOIC (300mil)
M24.3
X9268US24Z (Note) X9268US Z
0 to +70 24 Ld SOIC (300mil) (Pb-free) M24.3
X9268US24I
X9268US I
-40 to +85 24 Ld SOIC (300mil)
M24.3
X9268US24IZ (Note) X9268US ZI
-40 to +85 24 Ld SOIC (300mil) (Pb-free) M24.3
X9268TS24I-2.7
X9268TS G
2.7 to 5.5
100
-40 to +85 24 Ld SOIC (300mil)
M24.3
X9268TS24IZ-2.7 (Note) X9268TS ZG
-40 to +85 24 Ld SOIC (300mil) (Pb-Free) M24.3
*Add "T1" suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
FN8172 Rev.4.00
August 29, 2006
Page 2 of 22

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X9268
DETAILED FUNCTIONAL DIAGRAM
VCC
V+
SCL
SDA
A3
A2
A1
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
8
Data
RH0 RL0RW0
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 V-
RL1 RH1 RW1
CIRCUIT LEVEL APPLICATIONS
• Vary the gain of a voltage amplifier
• Provide programmable dc reference voltages for com-
parators 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 cir-
cuits
• 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 sys-
tems
• 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
FN8172 Rev.4.00
August 29, 2006
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