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X9258TB24-2.7 Datasheet(PDF) 1 Page - Xicor Inc. |
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X9258TB24-2.7 Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 22 page  REV 1.1.7 2/4/03 Characteristics subject to change without notice. 1 of 22 www.xicor.com Low Noise/Low Power/2-Wire Bus/256 Taps X9258 Quad Digital Controlled Potentiometers (XDCP™) FEATURES • Four potentiometers in one package • 256 resistor taps/pot–0.4% resolution • 2-wire serial interface • Wiper resistance, 40 Ω typical @ V+ = 5V, V- = -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 X9259 DESCRIPTION The X9258 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 2-wire 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 Interface and Control Circuitry SCL SDA A0 A1 A2 A3 R0 R1 R2 R3 Wiper Counter Register (WCR) Resistor Array Pot 1 VH1/RH1 VL1/RL1 R0 R1 R2 R3 Wiper Counter Register (WCR) VH0/RH0 VL0/RL0 Data 8 VW0/RW0 VW1/RW1 R0 R1 R2 R3 Resistor Array VH2/RH2 VL2/RL2 VW2/RW2 R0 R1 R2 R3 Resistor Array VH3/RH3 VL3/RL3 VW3/RW3 Wiper Counter Register (WCR) Wiper Counter Register (WCR) Pot 3 Pot 2 WP Pot 0 VCC VSS V+ V- APPLICATION NOTES AVAILABLE AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135 |
Similar Part No. - X9258TB24-2.7 |
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Similar Description - X9258TB24-2.7 |
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