WM8945ECS データシートの表示（PDF） - Wolfson Microelectronics plc

部品番号

コンポーネント説明

メーカー

WM8945ECS

Mono Low-Power CODEC with Video Buffer and Touch Panel Controller

Wolfson Microelectronics plc 

w

WM8945

Mono Low-Power CODEC with

Video Buffer and Touch Panel Controller

DESCRIPTION

FEATURES

The WM8945 is a highly integrated low power hi-fi CODEC

designed for portable devices such as digital still cameras.

Up to 4 analogue inputs may be connected; a 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.

Flexible digital mixing and powerful DSP functions are available.

Programmable filters and other processes may be applied to the

ADC or DAC signal paths. The DSP functions include 5 notch

filters, 5-band EQ, dynamic range control and the Wolfson

ReTune™ feature.

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.

The WM8945 is controlled via an I2C or SPI interface. Additional

functions include 4-wire Touch Panel controller, Auxiliary ADC,

Digital beep generator, Video buffer, programmable GPIO

functions, Frequency Locked Loop (FLL) for flexible clocking

support and integrated LDO for low noise supply regulation.

The WM8945 is supplied in 36-ball W-CSP package, ideal for

portable systems.

 Hi-fi audio CODEC

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

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

 4 analogue audio inputs

 Integrated bias reference for electret microphones

 Digital microphone interface

 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

- Direct Form 1 (DF1) programmable digital filter

 Digital beep generator

 Mono line output

 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

 4-wire Touch Panel interface controller

 Auxiliary ADC for DC measurement or battery monitoring

 Integrated LDO low-noise voltage regulator

 36-ball W-CSP package (2.96 x 3.06 x 0.7mm, 0.5mm pitch)

APPLICATIONS

 Digital Still Cameras (DSC)

 Multimedia phones

DCVDD DBVDD

XP

YN

TOUCH PANEL

YP

INTERFACE

XN

SPKVDD

AUX ADC

VBIN

VBREFR VBOUT

CURRENT MODE

VIDEO BUFFER

W

WM8945

AUX1

AUX2

IN1L/DMICDAT

IN2L

Analogue Mic

Mux / PGA

DMICDAT

DMICCLK

(GPIO)

Digital Mic

Interface

ADC L

DAC L

-1

ADC /

Record

Digital

Filters

DSP Core

(Re-Tune EQ,

Dynamic Range

Control)

DAC

Digital

Filters

OUTPUT

MIXERS

LINEOUTL

SPKOUTL

SPKOUTR

Digital Beep

Generator

MICBIAS

Reference

LDO

DIGITAL AUDIO

INTERFACE

FLL

CONTROL

INTERFACE

GPIO

WOLFSON MICROELECTRONICS plc

To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews

Production Data, May 2011, Rev 4.1

Copyright 2011 Wolfson Microelectronics plc

Share Link: