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WM8955LEFL 数据表(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8955LEFL 数据表(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 43 page  WM8955L STEREO DAC FOR PORTABLE AUDIO APPLICATIONS WOLFSON MICROELECTRONICS PLC www.wolfsonmicro.com Product Preview, May2003, Rev 0.4 Copyright 2003 Wolfson Microelectronics plc DESCRIPTION The WM8955L is a low power, high qualitystereo DAC with integrated headphone and loudspeaker amplifiers, designed to reduce external component requirements in portable digital audio applications. The on-chip headphone amplifiers can deliver 40mW into a 16 Ω load. Advanced on-chip digital signal processing performs bass and treble tone control. The WM8955L can operate as a master or a slave, and includes an on-chip PLL. It can use most master clock frequencies commonlyfound in portable sy stems, including USB, GSM, CDMA or PDC clocks, or standard 256fs clock rates. Different audio sample rates such as 48kHz, 44.1kHz, 8kHz and manyothers are supported. The WM8955L operates on supplyvoltages from 1.8V up to 3.6V, although the digital core can operate on a separate supplydown to 1.42V, saving power. Different sections of the chip can also be powered down under software control. The WM8955L is supplied in a verysmall and thin 5x5mm QFN package, ideal for use in hand-held and portable systems. FEATURES • DAC SNR 98dB, THD -95dB (‘A’ weighted @ 48kHz, 3.3V) • On-chip 400mW BTL Speaker Driver (mono) • On-chip Headphone Driver ° 40mW output power on 16Ω /3.3V ° THD –80dB at 20mW, SNR 90dB with 16Ω load • Stereo and Mono Line-in mix into DAC output • SeparatelyMixed Stereo and Mono Outputs • Digital Tone Control and Bass Boost • Low Power ° Down to 7mW for stereo playback (1.8V / 1.5V supplies) ° 10µW StandbyMode • Low SupplyVoltages ° Analogue 1.8V to 3.6V ° Digital core: 1.42V to 3.6V ° Digital I/O: 1.42V to 3.6V • Master clocks supported: GSM, CDMA, PDC, USB or standard audio clocks • Audio sample rates supported: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 88.2, 96kHz • 32-pin QFN package, 5x5x0.9mm size, 0.5mm lead pitch APPLICATIONS • Smartphone / Multimedia Phone • Digital Audio Player BLOCK DIAGRAM DAC LI2LO MI2LO MI2RO RI2RO LI2MO RI2MO LD2LO RD2LO LD2MO RD2MO LD2RO RD2RO LEFT MIXER RIGHT MIXER MONO MIXER HPDETECT DCVDD DBVDD DGND DIGITAL FILTERS TONE CONTROL DIGITAL AUDIO INTERFACE BCLK DACDAT DACLRC 50K 50K W WM8955L DAC CONTROL INTERFACE CSB SDIN SCLK MODE ROUT1VOL LOUT1VOL MONOVOL LOUT1 ROUT1 MONOOUT LOUT2 ROUT2 -1 ROUT2 INV Loudspeaker L - (-R) =L+R ROUT2VOL LOUT2VOL OUT3 VREF MONOOUT M U X ROUT1 VREF -1 DIFF. IN MCLK f/2 PLL CLKOUT f/2 MCLK SEL CLKOUT SEL MCLK DIV2 CLKOUT DIV2 |
类似零件编号 - WM8955LEFL |
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类似说明 - WM8955LEFL |
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