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WM8988

更新时间： 2024-11-10 01:24:27
品牌 Logo 应用领域
凌云 - CIRRUS /
页数 文件大小 规格书
58页 1474K
描述
Stereo CODEC for Portable Audio Applications

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WM8988 数据手册

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WM8988  
Stereo CODEC for Portable Audio Applications  
DESCRIPTION  
FEATURES  
DAC SNR 100dB (‘A’ weighted), THD –90dB at 48kHz, 3.3V  
ADC SNR 93dB (‘A’ weighted), THD -81dB at 48kHz, 3.3V  
Programmable ALC / Noise Gate  
The WM8988 is a low power, high quality stereo CODEC  
designed for portable digital audio applications.  
The device integrates complete interfaces to 2 stereo  
headphone or line out ports. External component  
requirements are drastically reduced as no separate  
headphone amplifiers are required. Advanced on-chip digital  
signal processing performs graphic equaliser, 3-D sound  
enhancement and automatic level control for the  
microphone or line input.  
2x On-chip Headphone Drivers  
-
-
>40mW output power on 16/ 3.3V  
THD –80dB at 20mW, SNR 90dB with 16load  
Digital Graphic Equaliser  
Low Power  
-
-
7mW stereo playback (1.8V / 1.5V supplies)  
14mW record and playback (1.8V / 1.5V supplies)  
Low Supply Voltages  
The WM8988 can operate as a master or a slave, with  
various master clock frequencies including 12 or 24MHz for  
USB devices, or standard 256fs rates like 12.288MHz and  
24.576MHz. Different audio sample rates such as 96kHz,  
48kHz, 44.1kHz are generated directly from the master  
clock without the need for an external PLL.  
-
-
-
Analogue 1.8V to 3.6V  
Digital core: 1.42V to 3.6V  
Digital I/O: 1.8V to 3.6V  
256fs / 384fs or USB master clock rates: 12MHz, 24MHz  
Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48,  
88.2, 96kHz generated internally from master clock  
4x4mm COL package  
The WM8988 operates at supply voltages down to 1.8V,  
although the digital core can operate at voltages down to  
1.42V to save power, and the maximum for all supplies is  
3.6 Volts. Different sections of the chip can also be powered  
down under software control.  
APPLICATIONS  
Portable Multimedia players  
Multimedia handsets  
Handheld gaming  
The WM8988 is supplied in a very small and thin 4x4mm  
COL package, ideal for use in hand-held and portable  
systems.  
BLOCK DIAGRAM  
DGND  
DCVDD  
DBVDD  
HPGND  
HPVDD  
LMIXSEL  
M
U
X
LEFT  
MIXER  
WM8988  
LI2LO  
RI2LO  
DC MEASUREMENT  
LD2LO  
RD2LO  
LINPUT1  
LINPUT2  
M
U
X
PGA  
+ MIC  
BOOST  
LOUT1  
(headphone / line output  
LOUT1VOL  
ADC  
ADC  
DAC  
DAC  
DIGITAL  
FILTERS  
DIGITAL  
FILTERS  
LINSEL  
DIFF.  
INPUT  
L1-R1 OR  
L2-R2  
ANALOGUE  
MONO MIX  
GRAPHIC  
EQUALISER  
VOLUME  
HPCOM  
DIGITAL  
MONO MIX  
BASS  
BOOST  
RINSEL  
RIGHT  
MIXER  
LI2RO  
RI2RO  
M
U
X
PGA  
+ MIC  
BOOST  
LD2RO  
RD2RO  
RINPUT2  
RINPUT1  
ROUT1  
(headphone / line output  
ROUT1VOL  
LOUT2VOL  
DC MEASUREMENT  
LOUT2  
(headphone / line output  
M
U
X
RMIXSEL  
LCOM  
AUDIO  
INTERFACE  
CLOCK  
CIRCUITRY  
CONTROL  
INTERFACE  
ROUT2  
(headphone / line output  
50K  
50K  
ROUT2VOL  
Rev 4.2  
DEC ‘16  
Copyright Cirrus Logic, Inc., 2008–2016  
http://www.cirrus.com  
(All Rights Reserved)  
 
 
 
 
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