WM8955L

w WM8955L Stereo DAC for Portable Audio Applications DESCRIPTION FEATURES The WM8955L is a low power, high quality stereo 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 16Ω 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 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 WM8955L 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 WM8955L is supplied in a very small and thin 5x5mm QFN package, ideal for use in hand-held and portable systems. BLOCK DIAGRAM DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V) On-chip 400mW BTL Speaker Driver (mono) On-chip Headphone Driver - 40mW output power on 16Ω / 3.3V - SNR 96dB, THD –79dB at 20mW with 16Ω load 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) -...