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WM8955

更新时间： 2024-09-17 12:47:23
品牌 Logo 应用领域
欧胜 - WOLFSON 便携式
页数 文件大小 规格书
43页 377K
描述
STEREO DAC FOR PORTABLE AUDIO APPLICATIONS

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中文翻译

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WM8955 数据手册

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WM8955L  
STEREO DAC FOR PORTABLE AUDIO APPLICATIONS  
DESCRIPTION  
FEATURES  
•
•
•
DAC SNR 98dB, THD -95dB (‘A’ weighted @ 48kHz, 3.3V)  
On-chip 400mW BTL Speaker Driver (mono)  
On-chip Headphone Driver  
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.  
°
°
40mW output power on 16Ω / 3.3V  
THD –80dB at 20mW, SNR 90dB with 16Ω load  
The on-chip headphone amplifiers can deliver 40mW into a  
16Ω load. Advanced on-chip digital signal processing  
performs bass and treble tone control.  
•
•
•
•
Stereo and Mono Line-in mix into DAC output  
SeparatelyMixed Stereo and Mono Outputs  
Digital Tone Control and Bass Boost  
Low Power  
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 systems, 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.  
°
°
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  
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.  
•
•
•
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  
The WM8955L is supplied in a verysmall and thin 5x5mm  
QFN package, ideal for use in hand-held and portable  
systems.  
APPLICATIONS  
•
•
Smartphone / Multimedia Phone  
Digital Audio Player  
BLOCK DIAGRAM  
DBVDD DCVDD  
DGND  
MONOOUT  
ROUT1  
-1  
M
U
X
OUT3  
DIFF. IN  
LI2LO  
W
WM8955L  
LEFT  
MIXER  
VREF  
LD2LO  
RD2LO  
LD2MO  
RD2MO  
LD2RO  
RD2RO  
LOUT1  
CSB  
SDIN  
LOUT1VOL  
MONOVOL  
MI2LO  
LI2MO  
DAC  
DAC  
CONTROL  
INTERFACE  
MONO  
MIXER  
DIGITAL  
FILTERS  
SCLK  
MODE  
MONOOUT  
TONE  
CONTROL  
RI2MO  
MI2RO  
BCLK  
DACLRC  
DACDAT  
DIGITAL  
AUDIO  
INTERFACE  
RIGHT  
MIXER  
ROUT1  
LOUT2  
MCLK  
SEL  
ROUT1VOL  
LOUT2VOL  
MCLK  
DIV2  
RI2RO  
MCLK  
f/2  
PLL  
Loudspeaker  
L - (-R)  
= L+R  
VREF  
CLKOUT  
SEL  
ROUT2  
INV  
-1  
50K  
50K  
CLKOUT  
f/2  
ROUT2  
CLKOUT  
DIV2  
ROUT2VOL  
HPDETECT  
WOLFSON MICROELECTRONICS PLC  
www.wolfsonmicro.com  
Product Preview, May2003, Rev 0.4  
Copyright 2003 Wolfson Microelectronics plc  
1234567...43

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