X9271
Single Digitally-Controlled (XDCP™) Potentiometer
Key Features
- 256 Resistor Taps
- SPI Serial Interface for Write, Read, and Transfer Operations of Potentiometer
- Wiper Resistance, 100Ω typical @ VCC = 5V
- 16 Nonvolatile Data Registers
- Nonvolatile Storage of Multiple Wiper Positions
- Power-on Recall; Loads Saved Wiper Position on Power-up
- Standby Current < 3µA Max
- VCC = 2.7V to 5.5V Operation
- 50kΩ, 100kΩ Versions of End-to-End Resistance
- 100-yr Data Retention
- Endurance: 100,000 Data Changes per Bit per Register
- 14-Lead TSSOP
- Low-power CMOS
- Pb-free Plus Anneal Available (RoHS Compliant)
Description
The X9271 integrates a single, digitally controlled potentiometer (XDCP™) on a monolithic CMOS integrated circuit.
The digitally controlled potentiometer is implemented by 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 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 though the switches. Power-up 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.
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 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
