Datasheet > WM8944

WM8944

更新时间： 2024-09-18 17:02:11

品牌	Logo	应用领域
凌云 - CIRRUS		编解码器
页数	文件大小	规格书
165页	2648K
描述
带视频缓冲器的单声道编解码器

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中文翻译

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WM8944 数据手册

WM8944B

Mono Low-Power CODEC with Video Buffer

DESCRIPTION

FEATURES



Hi-fi audio CODEC

The WM8944B is a highly integrated low power hi-fi CODEC

designed for portable devices such as digital still cameras.

94dB SNR during ADC recording (‘A’ weighted)

96dB SNR during DAC playback (‘A’ weighted)

Up to 2 analogue inputs may be connected; a stereo digital

microphone interface is also provided. Flexible output mixing

options support single-ended and differential configurations,

with outputs derived from the digital audio paths or from

analogue bypass paths. Mono line output and mono BTL

headphone/speaker drive is supported.



2 analogue audio inputs

Integrated bias reference for electret microphones

Digital microphone interface (Stereo)

Powerful digital mixing / DSP functions:

5-notch filters

5-band equalizer (EQ)

ReTune™ parametric filter

Dynamic range control and noise gate

Low-pass/High-pass filters

Flexible digital mixing and powerful DSP functions are

available. Programmable filters and other processes may be

applied to the ADC and DAC signal paths simultaneously. The

DSP functions include 5 notch filters, 5-band EQ, dynamic

range control and the ReTune™ feature.

Direct Form 1 (DF1) programmable digital filter

3D stereo enhancement (for digital mic input)



Digital beep generator

Mono line output

The ReTune™ feature is a sophisticated digital filter that can

compensate for imperfect characteristics of the housing,

loudspeaker or microphone components in an application.

The ReTune algorithm can provide acoustic equalisation and

selective phase (delay) control of specific frequency bands.

Mono BTL headphone/speaker output driver

I2S digital audio interface - sample rates 8kHz to 48kHz

Frequency Locked Loop (FLL) frequency conversion / filter

Video buffer function

Integrated LDO low-noise voltage regulator

25-ball W-CSP package (2.41 x 2.41 x 0.55mm, 0.5mm pitch)

The WM8944B is controlled via a I2C or SPI interface.

Additional functions include Digital beep generator, Video

buffer, programmable GPIO functions, Frequency Locked

Loop (FLL) for flexible clocking support and integrated LDO

for low noise supply regulation.

APPLICATIONS



Digital Still Cameras (DSC)

Multimedia phones

The WM8944B is supplied in 25-ball W-CSP package, ideal

for portable systems.

DCVDD

DBVDD

SPKVDD

VBIN

VBREFR

VBOUT

WM8944B

CURRENT MODE

VIDEO BUFFER

AUX

LINEOUT

Analogue Mic

Mux / PGA

IN1/DMICDAT

ADC L

DAC L

DSP Core

(L/HPF, 3D

Surround,

5-notch filter,

Re-Tune EQ,

Dynamic Range

Control)

OUTPUT

MIXERS

-1

SPKOUTP

SPKOUTN

ADC /

DAC

Digital

Filters

Record

Digital

Filters

DMICDAT

Digital Mic

Interface

DMICCLK

(GPIO)

Digital Beep

Generator

DIGITAL AUDIO

INTERFACE

CONTROL

INTERFACE

FLL

GPIO

Reference

LDO

MICBIAS

Rev 4.4

JUL ‘18

http://www.cirrus.com

12 3 4 5 6 7...165

中文翻译

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与WM8944相关器件

型号	品牌	获取价格	描述	数据表
WM8944B	CIRRUS	获取价格	Mono Low-Power CODEC with Video Buffer
WM8944BECS/R	CIRRUS	获取价格	PCM Codec, A/MU-Law, 1-Func, CMOS, PBGA25, WCSP-25
WM8945	WOLFSON	获取价格	Mono Low-Power CODEC with Video Buffer and Touch Panel Controller
WM8945ECS/R	WOLFSON	获取价格	Mono Low-Power CODEC with Video Buffer and Touch Panel Controller
WM8946	WOLFSON	获取价格	Stereo Low-Power CODEC with Video Buffer
WM8946	CIRRUS	获取价格	带视频缓冲器的立体声编解码器
WM8946ECS/R	WOLFSON	获取价格	Stereo Low-Power CODEC with Video Buffer
WM8948	WOLFSON	获取价格	Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller
WM8948ECS/R	WOLFSON	获取价格	Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller
WM8950	WOLFSON	获取价格	ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS

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