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Wolfson Microelectronics plc - STEREO DAC FOR PORTABLE AUDIO APPLICATIONS

Numéro de référence WM8955LEFL
Description STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
Fabricant Wolfson Microelectronics plc 
Logo Wolfson Microelectronics plc 





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WM8955LEFL fiche technique
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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)
- 10μW 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
32-lead QFN package, 5x5x0.9mm size, 0.5mm lead pitch
APPLICATIONS
Smartphone / Multimedia Phone
Digital Audio Player
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, May 2010, Rev 4.3
Copyright ©2010 Wolfson Microelectronics plc

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