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The X9111 integrates a single, digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit.

The digital controlled potentiometer is implemented using 1023 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 SPI bus interface. The 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 contents of the WCR control the position of the wiper on the resistor array through the switches. Power-up recalls the contents of the default data register (DR0) to the WCR.

The XDCP can be used as a 3-terminal potentiometer or as a 2-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.

Key Features

• 1024 resistor taps – 10-bit resolution
• SPI serial interface for write, read, and transfer operations of the potentiometer
• Wiper resistance, 40Ω typical at 5V
• Four nonvolatile Data Registers
• Nonvolatile storage of multiple wiper positions
• Power-on recall, loads saved wiper position on power-up
• Standby current <3μA maximum
• VCC: 2.7V to 5.5V operation
• 100kΩ end-to-end resistance
• 100-year data retention
• Endurance: 100,000 data changes per bit per register
• 14 Ld TSSOP
• Low-power CMOS
• Single supply version of the X9110
• Pb-Free (RoHS compliant)

Applications

• 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 circuitsSystem 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