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X9409 Datasheet(PDF) 1 Page - Xicor Inc. |
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X9409 Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 21 page  REV 1.6 1/30/03 Characteristics subject to change without notice. 1 of 21 www.xicor.com Low Noise/Low Power/2-Wire Bus X9409 Preliminary Information Quad Digitally Controlled Potentiometers (XDCP™) FEATURES • Four potentiometers per package • 64 resistor taps • 2-wire serial interface for write, read, and trans- fer operations of the potentiometer •50 Ω Wiper resistance, typical at 5V. • Four non-volatile data registers for each potentiometer • Non-volatile storage of multiple wiper position • Power on recall. Loads saved wiper position on power up. • Standby current < 1µA typical • System VCC: 2.7V to 5.5V operation • 10K Ω, 2.5KΩ End to end resistance • 100 yr. data retention • Endurance: 100,000 data changes per bit per register • Low power CMOS • 24-lead SOIC, 24-lead TSSOP, and 24-lead CSP (Chip Scale Package) Packages DESCRIPTION The X9409 integrates 4 digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 63 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 through 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/ VL1/RL1 R0 R1 R2 R3 Wiper Counter Register (WCR) VH0/RHO Data 8 VW0/ VW1/ 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 RW1 RH1 RWO VL0/ RLO Pot 0 VCC VSS APPLICATION NOTES AVAILABLE AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135 |
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