WM8955_06 Datasheet, PDF (1/46 Pages) Wolfson Microelectronics plc – Stereo DAC For Portable Audio Applications

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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.
•
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
The WM8955L is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
APPLICATIONS
• Smartphone / Multimedia Phone
• Digital Audio Player
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Production Data, March 2006, Rev 4.2
Copyright 2006 Wolfson Microelectronics plc