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WM8941GEFLV PDF预览

WM8941GEFLV

更新时间： 2024-09-17 03:54:39
品牌 Logo 应用领域
欧胜 - WOLFSON 解码器驱动器编解码器
页数 文件大小 规格书
96页 1210K
描述
Mono CODEC with Speaker Driver and Video Buffer

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WM8941GEFLV 数据手册

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WM8941  
w
Mono CODEC with Speaker Driver and Video Buffer  
DESCRIPTION  
FEATURES  
•
•
•
•
•
Mono CODEC:  
The WM8941 is a low power, high quality mono CODEC  
designed for portable applications such as digital still cameras  
or camcorders.  
Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz  
DAC SNR 98dB, THD -84dB (‘A’-weighted @ 8 – 48ks/s)  
ADC SNR 94dB, THD -80dB (‘A’-weighted @ 8 – 48ks/s)  
On-chip Headphone/Speaker Driver  
The device integrates support for a differential or single ended  
mic, and includes drivers for speakers or headphone, and  
mono line output. External component requirements are  
reduced as no separate microphone or headphone amplifiers  
are required. A high performance, low power current-mode  
video buffer provides inherent short circuit protection.  
-
-
40mW output power into 16Ω  
BTL speaker drive 0.4W into 8Ω  
•
•
Additional MONO Line output  
Multiple analog or ‘Aux’ inputs, plus analog bypass path  
•
•
Mic Preamps :  
Differential or single end Microphone Interface  
An integrated video buffer is provided which has  
programmable gain from 0-6dB (6-12dB unloaded), sync-tip  
clamp and a 3rd order input low pass filter for signal re-  
construction.  
-
-
-
Programmable preamp gain  
Pseudo differential inputs with common mode rejection  
Programmable ALC / Noise Gate in ADC path  
•
Low-noise bias supplied for electret microphones  
Advanced Sigma Delta Converters are used along with digital  
decimation and interpolation filters to give high quality audio at  
sample rates from 8 to 48ks/s. A selectable high pass filter  
and four fully-programmable notch filters are available in the  
ADC path. An advanced mixed signal ALC function with noise  
gate is provided, while readback of PGA gain during ALC  
operation is supported. The digital audio interface supports A-  
law and µ-law companding.  
OTHER FEATURES  
•
•
•
•
•
•
Integrated video buffer with LPF and clamp.  
Digital Playback Limiter  
Programmable high pass filter (wind noise reduction)  
4 notch filters (narrowband noise suppression)  
On-chip PLL  
Low power, low voltage  
-
2.5V to 3.6V (digital: 1.71V to 3.6V)  
An on-chip PLL is provided to generate the required Master  
Clock from an external reference clock. The PLL clock can  
also be output if required elsewhere in the system.  
•
4x4x0.75mm 28 lead QFN package  
APPLICATIONS  
The WM8941 operates at supply voltages from 2.5 to 3.6V,  
although the digital supplies can operate at voltages down to  
1.71V to save power. Different sections of the chip can also be  
powered down under software control using the selectable two  
or three wire control interface.  
•
•
Digital still cameras and camcorders  
General purpose mono audio CODEC with video buffer  
WM8941 is supplied in a very small 4x4mm QFN package,  
offering high levels of functionality in minimum board area,  
with high thermal performance.  
WOLFSON MICROELECTRONICS plc  
Pre Production, Rev 3.3, December 2007  
Copyright ©2007 Wolfson Microelectronics plc  
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/  
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