Table of Contents Section 1 – New and Featured Products

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® Signal Conditioning/Calibration and Control Products X9455 Dual Two-wiper Digitally-Controlled (XDCP ) Potentiometer Product Highlights • Dynamic Calibration: Coarse & Fine Tuning — Serial 2-Wire bus — Up/Down Interface • Non-volatile Digital Potentiometer • Low Power • Dual Two-wiper 256-tap Key Features • Dual Two-wiper Solid State Potentiometer • 256 Resistor taps/pot–0.4% resolution • 2-wire Serial Interface for Write, Read, and Transfer Operations of the Potentiometer • Power On Recall. Loads Saved Wiper Position on Power-Up • 2.8kΩ,10kΩ, 50kΩ, 100kΩ Version of Total Pot Resistance • Endurance: 100, 000 Data Changes per Bit per Register • 24-Lead TSSOP Benefits • Digital Programmability • Set and Forget Calibration • Reliability • Dynamic Controls — Real time calibration — Adaptive response • Non-volatile storage and recall of wiper position • Power On Recall circuits • General purpose EEPROM Block Diagram Description The X9455 integrates 2 digitally controlled potentiometers (XDCP) with dual wipers on each potentiometer 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 wiper terminals through switches. The position of each wiper on the array is controlled by the user through the Up/Down or 2-wire bus interface. Each potentiometer wiper has associated with it two volatile Wiper Counter Register (WCR) and each WCR has associated with it four nonvolatile Data Registers 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. The contents of the default data registers (DR0A, DR0B, DR1A, DR1B ) are loaded into the WCR on power-up. The DCP can be used as a four-terminal potentiometer or as a four-terminal variable resistor network in a wide variety of applications including the programming of bias voltages, window comparators, and three resistor programmable networks. Pin Configuration DS0 A0 RW0B NC NC U/D Vcc RL0 RH0 RW0A A2 WP 1 2 3 4 5 6 7 8 9 10 11 12 TSSOP X9455 24 23 22 21 20 19 18 17 16 15 14 13 DS1 SCL RL1 RH1 RW1A CS Vss RW1B NC NC A1 SDA New & Featured Products V CC R H0 R H1 A2 A1 A0 SDA SCL DS0 2-wire Interface Up/Down Interface POWERUP, INTERFACE CONTROL AND STATUS WCR0A DR0A0 DR0A1 DR0A2 DR0A3 WCR0B DR0B0 DR0B1 DR0B2 DR0B3 DCP0 WCR1A WCR1B DR1A0 DR1B0 DR1A1 DR1B1 DR1A2 DR1B2 DR1A3 DR1B3 DCP1 DS1 CS U/D V SS WP R W0A R W0B R L0 R W1A R W1B R L1 * for ordering information refer to page 1-45 See Product Family Tree on page 2-1 www.xicor.com 1–43
® Signal Conditioning/Calibration and Control Products X9460 Audio Logarithmic Digitally-Controlled Potentiometers with Zero Amplitude Wiper Switching Product Highlights • X9460 is a monolithic CMOS IC that incorporating two logarithmically tapered non-volatile DCPs • The XDCPs consist of a string of 31 polycrystalline resistors (total 33K) with switches to connect the wiper to any of the taps • A 2-wire interface controls wiper position, or an up/down control can be programmed to change both pots or a single pot one position at a time • The DCPs are normally connected as voltage dividers for audio control applications Key Features • Dual ±2.7 to ±5V supply operation • Wiper switching at zero wiper voltage • Low 3µA standby current • Dual DCP control for left and right channels • 0 to -62dB volume control in 32 steps • -100dB crosstalk rejection • -120dB signal-noise ratio • Slave address Benefits • Fits wide variety of applications • Noise-free changes in volume • Ideal for portable audio products • Versatile stereo volume/fader/mute controls • Wide dynamic range • Qualifies for high fidelity equipment • Design for 2 to 8 channels using only 2-wire control Description The X9460 integrates two digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit. The two XDCPs can be used as stereo gain controls in audio applications. Read/Write operations can directly access each channel independently or both channels simultaneously. Increment/ Decrement can adjust each channel independently or both channels simultaneously. The X9460 contains a zero amplitude wiper switching circuit that delays wiper changes until the next zero crossing of the audio signal. The digitally controlled potentiometer is implemented using 31 polysilicon resistors in a log array. Between each of the resistors are tap points connected to the wiper terminal through switches. The XDCPs are designed to minimize wiper noise to avoid pops and clicks during audio volume transitions. The position of the wiper on the array is controlled by the user through the 2-wire serial bus interface. Power up reset the wiper to the mute position. Pin Configuration TSSOP SDA 1 14 V SS 5 10 SCL 2 13 V CC 3 12 V+ 4 X9460 11 A1 6 9 A0 7 8 V- R H-right R L-right R W-right R H-left R L-left R W-left Block Diagram V CC V+ SCL SDA A0 A1 INTERFACE AND CONTROL CIRCUITRY Power On Recall mute 8 DATA WIPER COUNTER REGISTER (WCR) POT Left R H-Left R L-Left R W-Left R W-Right WIPER COUNTER REGISTER (WCR) R H-Right R L-Right POT Right * for ordering information refer to page 1-45 V SS V- See Product Family Tree on page 2-1 1–44 www.xicor.com
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