WM8994 Wolfson Microelectronics plc, WM8994 Datasheet

WM8994

Manufacturer Part Number

WM8994

Description

Multi-channel Audio Hub Codec For Smartphones

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8994.pdf (3 pages)

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DESCRIPTION

The WM8994 is a highly integrated ultra-low power hi-fi CODEC

designed for smartphones and other portable devices rich in

multimedia features.

An integrated stereo class D/AB speaker driver and class W

headphone driver minimize power consumption during audio

playback.

The device requires only Vbatt and a 1.8V supply, generating all

other internal supply rails from integrated LDOs.

Stereo full duplex asynchronous sample rate conversion and

multi-channel digital mixing combined with powerful analogue

mixing allow the device to support a huge range of different

architectures and use cases.

A fully programmable parametric EQ provides speaker

compensation and a dynamic range controller can be used in

the ADC or DAC paths for maintaining a constant signal level,

maximizing

overloading and clipping.

A smart digital microphone interface provides power regulation,

a low jitter clock output and decimation filters for up to four

digital microphones. A MIC activity detect with interrupt is

available.

Active ground loop noise rejection and DC offset correction help

prevent pop noise and suppress ground noise on the

headphone outputs.

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Multi-Channel Audio Hub CODEC for Smartphones

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FEATURES

•

APPLICATIONS

Smartphones and music phones

Portable navigation

Mobile internet devices

WM8994 Product Brief

Hi-Fi 24-bit 4-channel DAC and 2-channel ADC

100dB SNR during stereo DAC playback (‘A’ weighted)

Smart MIC interface

1W stereo / 2W mono class D/AB speaker driver

Capless class W headphone drivers

4 line outputs (single-ended or differential)

BTL earpiece driver

Digital audio interfaces for multi-processor architecture

ReTune

Programmable dynamic range controller

Dual FLL provides all necessary clocks

Active noise reduction circuits

Integrated LDO regulators

72-ball W-CSP package (4.511mm x 4.023mm x 0.7mm)

Power, clocking and data input for up to four digital MICs

High performance analogue MIC interface

MIC activity monitor & interrupt allows processor to sleep

Integrated charge pump

6mW total power for DAC playback to headphones

Asynchronous stereo duplex sample rate conversion

Powerful mixing and digital loopback functions

Self-clocking modes allows processor to sleep

All standard sample rates from 8kHz to 96kHz

DC offset correction removes pops and clicks

Ground loop noise cancellation

Mobile 5-band, 6-channel parametric EQ

Product Brief, July 2009, Rev 1. 1

Related parts for WM8994

WM8994 Summary of contents

Page 1

... Multi-Channel Audio Hub CODEC for Smartphones DESCRIPTION The WM8994 is a highly integrated ultra-low power hi-fi CODEC designed for smartphones and other portable devices rich in multimedia features. An integrated stereo class D/AB speaker driver and class W headphone driver minimize power consumption during audio playback. The device requires only Vbatt and a 1.8V supply, generating all other internal supply rails from integrated LDOs ...

Page 2

... WM8994 ORDERING INFORMATION ORDER CODE TEMPERATURE RANGE WM8994ECS/RV -40°C to +85°C Note: Reel quantity = 3500 TYPICAL SMARTPHONE APPLICATION Figure 1 shows a typical multi-processor smartphone or music phone application. Digital connections to a baseband processor, application processor, handset and headset MICs, Bluetooth, FM radio and analogue output devices are all supported. ...

Page 3

... Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS: Wolfson Microelectronics plc 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w WM8994 Product Brief, July 2009, Rev 1.1 3 ...

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