WM8971L Wolfson Microelectronics Ltd., WM8971L Datasheet

WM8971L

Manufacturer Part Number

WM8971L

Description

Stereo Codec for Portable Audio Applications

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8971L.pdf (61 pages)

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DESCRIPTION

The WM8971L is a low power, high quality stereo codec

designed for portable digital audio applications.

The device integrates complete interfaces to stereo or mono

microphones and a stereo headphone. External component

requirements are drastically reduced as no separate

microphone

Advanced on-chip digital signal processing performs

graphic equaliser, and automatic level control for the

microphone or line input.

The WM8971L can operate as a master or a slave, with

various master clock frequencies including 12 or 24MHz for

USB devices, or standard 256f

24.576MHz. Different audio sample rates such as 96kHz,

48kHz, 44.1kHz are generated directly from the master

clock without the need for an external PLL.

The WM8971L operates at supply voltages down to 1.8V,

although the digital core can operate at voltages down to

1.42V to save power, and the maximum for all supplies is

3.6 Volts. Different sections of the chip can also be powered

down under software control.

The WM8971L is supplied in a very small and thin 5x5mm

QFN package, ideal for use in hand-held and portable

systems.

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WOLFSON MICROELECTRONICS plc

Stereo CODEC for Portable Audio Applications

headphone

amplifiers

rates like 12.288MHz and

http://www.wolfsonmicro.com/enews/

are

required.

FEATURES

•

APPLICATIONS

•

DAC SNR 98dB (‘A’ weighted), THD –84dB at 48kHz, 3.3V

ADC SNR 95dB (‘A’ weighted), THD -82dB at 48kHz, 3.3V

Complete Stereo / Mono Microphone Interface

On-chip 400mW BTL Speaker Driver (mono)

On-chip Headphone Driver

Separately mixed mono output

Digital Graphic Equaliser

Low Power

Low Supply Voltages

256fs / 384fs or USB master clock rates: 12MHz, 24MHz

Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48,

5x5x0.9mm QFN package

Digital Still Cameras

MP3 Player / Recorders

Minidisc Player / Recorders

Portable Digital Music Systems

88.2, 96kHz generated internally from master clock

Programmable ALC / Noise Gate

>40mW output power on 16Ω / 3.3V

THD –80dB at 20mW, SNR 90dB with 16Ω load

No DC blocking capacitors required (capless mode)

7mW stereo playback (1.8V / 1.5V supplies)

14mW record and playback (1.8V / 1.5V supplies)

Analogue 1.8V to 3.6V

Digital core: 1.42V to 3.6V

Digital I/O: 1.8V to 3.6V

Production Data, August 2005, Rev 4.1

WM8971L

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