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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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WM8955BLGECO/V Datenblatt(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8955BLGECO/V Datenblatt(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 44 page  w WM8955BL Stereo DAC For Portable Audio Applications WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, February 2007, Rev 4.1 Copyright ©2007 Wolfson Microelectronics plc DESCRIPTION The WM8955BL is a low power, high quality stereo DAC with integrated headphone and earpiece 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 WM8955BL can operate as a master or a slave, and includes an on-chip PLL. It can use most master clock frequencies commonly found in portable systems, including USB, GSM, CDMA or PDC clocks, or standard 256fs clock rates. Different audio sample rates such as 48kHz, 44.1kHz, 8kHz and many others are supported. The WM8955BL operates on supply voltages from 1.8V up to 3.6V, although the digital core can operate on a separate supply down to 1.42V, saving power. Different sections of the chip can also be powered down under software control. The WM8955BL is supplied in a very small and thin 4x4mm QFN package, ideal for use in hand-held and portable systems. FEATURES • DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V) • On-chip Headphone Driver - 40mW output power on 16 Ω / 3.3V - SNR 96dB, THD –79dB at 20mW with 16 Ω load • On-chip BTL Earpiece Driver (mono) • Stereo and Mono Line-in mix into DAC output • Separately Mixed Stereo and Mono Outputs • Digital Tone Control and Bass Boost • Low Power - Down to 7mW for stereo playback (1.8V / 1.5V supplies) - 10 μW Shutdown Mode • Low Supply Voltages - Analogue and Digital I/O: 1.8V to 3.6V - Digital core: 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 • 28-lead QFN package, 4x4x0.75mm size • Software compatible with WM8750L, WM8751L, WM8955L APPLICATIONS • Smartphone / Multimedia Phone • Digital Audio Player BLOCK DIAGRAM |
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