X9251

Single Supply/Low Power/256-Tap/SPI Bus, Quad Digitally-Controlled (XDCP™) Potentiometer

Product Status: Mass Production

OVERVIEW

The X9251 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 SPI bus interface. Each 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 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.

KEY FEATURES

  • Four potentiometers in one package
  • 256 resistor taps–0.4% resolution
  • SPI serial interface for write, read, and transfer operations of the potentiometer
  • Wiper resistance: 100Ω typical at VCC = 5V
  • 4 Nonvolatile data registers for each potentiometer
  • Nonvolatile storage of multiple wiper positions
  • Standby current <5µA max
  • VCC: 2.7V to 5.5V operation
  • 50kΩ version of total resistance
  • 100 year data retention
  • Single supply version of X9250
  • Endurance: 100,000 data changes per bit per register
  • 24 Ld SOIC, 24 Ld TSSOP
  • Low power CMOS
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
X9251
Basic Information
Production Status
Mass Production
# of Devices/ Channels
4
# of Taps
256
Memory Type
Nonvolatile
Bus/Output Interface
SPI
Resistance Options (kΩ)
50
Supply Voltage Vcc (Min) (V)
2.7
Supply Voltage Vcc (Max) (V)
5.5
Supply Current Icc
50 µA
Resistance Taper
Linear
VL Min. Terminal Voltage
0 V
VL Max. Terminal Voltage
5.5 V
Wiper Current (mA)
4.4
Wiper Resistance (Ω)
200
Dual Supply Range (V)
N/A
Max Operating Temperature
85 °C
End-to-End Temperature Coefficient (ppm/øC)
300
Qualification Level
Standard
Single Supply Range (V)
0 to 5.5
Supply Voltage Vcc Range (V)
2.7 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

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