X9268

Features:

• DualTwo separate potentiometers
• 256 resistor taps/pot0.4% resolution
• 2-Wire Serial Interface for write, read, and transfer operations of the potentiometer
• Wiper Resistance, 100Ω typical @ 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
• V_CC: ±2.7V to ±5.5V Operation
• 50kΩ, 100kΩ versions of End to End Pot Resistance
• Endurance: 100,000 Data Changes per Bit per Register
• 100 yr. Data Retention
• 24-Lead SOIC, 24-Lead TSSOP
• Low Power CMOS
• Power Supply V_CC = ±2.7V to ±5.5V
V+ = 2.7V to 5.5V
V- = -2.7V to -5.5V




Application

• 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
• 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




Pinout






Specifications

Temperature under bias ..................... -65 to +135
Storage temperature .......................... -65 to +150
Voltage on SDA, SCL or any address input
with respect to VSS .................................... -1V to +7V
Voltage on V+ (referenced to V_SS)..........................10V
Voltage on V- (referenced to V_SS)..........................-10V
(V+) - (V-) ...............................................................12V
Any V_H/R_H .................................................................V+
Any V_L/R_L.............................................................VLead
temperature (soldering, 10 seconds)................... 300
I_W (10 seconds)....................................................±6mA

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; the functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Description

The X9268 integrates 2 digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit. The X9268 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 X9268 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.