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X9250 Datasheet(PDF) 1 Page - Xicor Inc. |
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X9250 Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 21 page  REV 1.1.5 1/31/03 Characteristics subject to change without notice. 1 of 21 www.xicor.com Low Noise/Low Power/SPI Bus/256 Taps X9250 Quad Digitally Controlled Potentiometers (XDCP™) FEATURES • Four potentiometers in one package • 256 resistor taps/pot–0.4% resolution • SPI serial interface • Wiper resistance, 40 Ω typical @ VCC = 5V • Four nonvolatile data registers for each pot • Nonvolatile storage of wiper position • Standby current < 5µA max (total package) • Power supplies —VCC = 2.7V to 5.5V —V+ = 2.7V to 5.5V —V– = -2.7V to -5.5V • 100K Ω, 50KΩ total pot resistance • High reliability —Endurance – 100,000 data changes per bit per register —Register data retention – 100 years • 24-lead SOIC, 24-lead TSSOP, 24-lead CSP (Chip Scale Package) • Dual supply version of X9251 DESCRIPTION The X9250 integrates 4 digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit. The digitally 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 SPI bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile Data Registers (DR0:DR3) 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. Power up recalls the contents of 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. BLOCK DIAGRAM R0 R1 R2 R3 Wiper Counter Register (WCR) Resistor Array VH1/RH1 VL1/RL1 R0 R1 R2 R3 Wiper Counter Register (WCR) Interface and Control Circuitry CS SCK A0 A1 VH0/RH0 VL0/RL0 Data 8 VW0/RW0 VW1/RW1 SO SI R0 R1 R2 R3 Wiper Counter Register (WCR) Resistor Array Pot 2 VH2/RH2 VL2/RL2 VW2/RW2 R0 R1 R2 R3 Wiper Counter Register (WCR) Resistor Array Pot 3 VH3/RH3 VL3/RH3 VW3/RW3 Pot1 HOLD WP Pot 0 VCC VSS V+ V- APPLICATION NOTE A V A I L A B L E AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135 |
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