Datasheet > WM8918

WM8918

更新时间： 2024-09-18 01:17:59

品牌	Logo	应用领域
凌云 - CIRRUS		/
页数	文件大小	规格书
176页	1616K
描述
Ultra Low Power DAC for Portable Audio Applications

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WM8918 数据手册

WM8918

Ultra Low Power DAC for Portable Audio Applications

DESCRIPTION

FEATURES



3.8mW quiescent power consumption for DAC to

headphone playback

The WM8918 is a high performance ultra-low power stereo

DAC optimised for portable audio applications.



DAC SNR 96dB typical, THD -86dB typical

The device features stereo ground-referenced headphone

amplifiers using the Wolfson ‘Class-W’ amplifier techniques -

incorporating an innovative dual-mode charge pump

architecture - to optimise efficiency and power consumption

during playback. The ground-referenced headphone and line

outputs eliminate AC coupling capacitors, and both outputs

include common mode feedback paths to reject ground

noise.



2.4mW quiescent power consumption for analogue bypass

playback



Control write sequencer for pop minimised start-up and

shutdown

Single register write for default start-up sequence

Control sequences for audio path setup can be pre-loaded

and executed by an integrated control write sequencer to

reduce software driver development and minimise pops and

clicks via Wolfson’s SilentSwitch™ technology.



Integrated FLL provides all necessary clocks

Self-clocking modes allow processor to sleep

All standard sample rates from 8kHz to 96kHz

The analogue input stage can be configured for single

ended or differential inputs. Up to 3 stereo microphone or

line inputs may be connected. The input impedance is

constant with PGA gain setting.



Stereo digital microphone input

3 single ended inputs per stereo channel

1 fully differential mic / line input per stereo channel

A stereo digital microphone interface is provided, with a

choice of two inputs. The analogue or digital microphone

inputs can be mixed into the headphone or line output paths.



Digital Dynamic Range Controller (compressor / limiter)

Digital sidetone mixing

A dynamic range controller provides compression and level

control to support a wide range of portable recording

applications in conjunction with the digital microphone

interface. Anti-clip and quick release features offer good

performance in the presence of loud impulsive noises.



Ground-referenced headphone driver

Ground-referenced line outputs



32-pin QFN package (4x4mm, 0.4mm pitch)

ReTune^TMMobile 5-band parametric equaliser with fully

programmable coefficients is integrated for optimization of

speaker characteristics. Programmable dynamic range

control is also available for maximizing loudness, protecting

speakers from clipping and preventing premature shutdown

due to battery droop.

APPLICATIONS



Wireless headsets

Portable multimedia players

Handheld gaming

Common audio sampling frequencies are supported from a

wide range of external clocks, either directly or generated

via the FLL.

The WM8918 can operate directly from a single 1.8V

switched supply. For optimal power consumption, the digital

core can be operated from a 1.0V supply.

WOLFSON MICROELECTRONICS plc

Production Data, January 2012, Rev 4.1

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

12 3 4 5 6 7...176

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与WM8918相关器件

型号	品牌	获取价格	描述	数据表
WM8918CGEFL/V	CIRRUS	获取价格	Consumer Circuit, CMOS, PQCC32, 4 X 4 MM, 0.75 MM HEIGHT, 0.40 MM PITCH, LEAD FREE, PLASTI
WM8940	WOLFSON	获取价格	Mono CODEC with Speaker Driver
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WM8940CGEFL/V	WOLFSON	获取价格	Mono CODEC with Speaker Driver
WM8940GEFL/RV	WOLFSON	获取价格	Mono CODEC with Speaker Driver
WM8940GEFL/V	WOLFSON	获取价格	Mono CODEC with Speaker Driver
WM8941	WOLFSON	获取价格	Mono CODEC with Speaker Driver and Video Buffer

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