X9259
Quad Digitally Controlled (XDCP™)Potentiometers
Key Features
- Four Separate Potentiometers in One Package
- 256 Resistor Taps-0.4% Resolution
- 2-Wire Serial Interface for Write, Read, and Transfer Operations of the Potentiometer
- Wiper Resistance: 100Ω typical @ VCC = 5V
- 4 Non-volatile Data Registers for Each Potentiometer
- Non-volatile Storage of Multiple Wiper Positions
- Standby Current <5µA Max
- VCC: 2.7V to 5.5V Operation
- 50kΩ, 100kΩ versions of Total Resistance
- Endurance: 100,000 Data Changes per Bit per Register
- 100 year Data Retention
- Single Supply Version of X9258
- 24 Ld SOIC, 24 Ld TSSOP
- Low Power CMOS
- Pb-Free Plus Anneal Available (RoHS Compliant)
Description
The X9259 integrates four digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the 2-wire bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and four non-volatile Data Registers that can be directly written to and read by the user. The content of the WCR controls the position of the wiper. At power-up, the device recalls the content of the default Data Registers of each DCP (DR00, DR10, DR20, and DR30) to the corresponding 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
- 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
