wm8900 Wolfson Microelectronics plc, wm8900 Datasheet

wm8900

Manufacturer Part Number

wm8900

Description

Ultra Low Power Codec For Portable Multimedia Applications Featuring Class G Ground Referenced Headphone Driver

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8900.pdf (117 pages)

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DESCRIPTION

The WM8900 is designed for portable multimedia applications

requiring low power consumption, high performance audio and

a compact form factor. Pop and click optimised ground

referenced headphone amplifiers provide high quality audio

performance and improved bass response whilst also

eliminating bulky headphone capacitors. Headphone amplifier

playback power consumption is minimised by implementing an

efficient class G amplifier powered by adaptive charge pump

technology. Flexible analogue signal routing and digital signal

processing

manipulation for fully featured multimedia applications whilst

minimising power consumption.

Stereo 24bit multi-bit sigma-delta ADCs and DACs are used

with over-sampling digital interpolation and decimation filters.

The master clock can be input directly or generated internally

by an integrated low power FLL. WM8900 operates at

analogue supply voltages down to 2.4v. The digital core can

operate at voltages down to 1.8v to save power. Different

sections of the chip can also be powered down under software

control. The WM8900 is supplied in a very small and thin

5x5x0.55mm QFN package, ideal for use in hand-held and

portable systems

Low power, high performance audio features can be realized

with a minimal set of small form factor external components,

reducing BOM costs and PCB dimensions

Ultra Low Power CODEC for Portable Multimedia Applications

WOLFSON MICROELECTRONICS plc

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Featuring Class G Ground Referenced Headphone Driver

capabilities

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FEATURES

•

APPLICATIONS

•

Highly Flexible Input and Output Configuration

Class-G Ultra-low Power Headphone Driver

Soft Mute Control

Low Power Consumption with User Selectable Modes

Low Supply Voltages

Low Power FLL

TDM Mode – dual data time slots for ADC and DAC

Audio Sample Rates (kHz): 8, 11.025, 16, 22.05, 24, 32,

DAC to HP SNR 97dB (‘A’ weighted, 2.4V)

DAC to HP THD -82dB at 48kHz Fs, 2.4V

ADC SNR 95dB (‘A’ weighted, 3.3V)

ADC THD -84dB at 48kHz Fs, 2.4V

44.1, 48 generated internally from master clock

5 x 5 x 0.55mm 40 lead QFN package

-25 ºC - +85ºC temperature range

MP3 players

Portable Multimedia Applications

Multimedia Handsets

2 single ended or pseudo differential mic inputs

2 stereo line inputs (eg. Line In / FM tuner)

Up to +48dB microphone/line input gain

Stereo output mixers with -15dB to +6dB gain range;

Up to 12.4mW per channel output power into 32Ω at 3.3V

Up to 6.6mW per channel output power into 32Ω at 2.4V

Ground referenced outputs

Pop and click suppression circuitry

9 mW stereo headphone playback (32Ω)

6 mW stereo headphone playback (32Ω)

5 mW bypass mode. Line in to stereo headphone

Analogue: 2.4V to 3.3V

Digital core: 1.8V to 3.3V

Digital I/O: 1.8V to 3.3V

Charge Pump High: 2.4V to 3.3V

Charge Pump Low: 1.6V to 3.3V

Supports MCLK input up to 19.2MHz or DACLRC input

mixing DAC outputs, line, auxiliary and mic inputs

(AVDD = 2.4V, DCVDD = 1.8V, 48k fs)

(AVDD = 2.4V, DCVDD = 1.8V, 8k fs, quiescent)

playback (32Ω) (AVDD = 2.4V, DCVDD = 1.8V)

down to 8kHz

Production Data , August 2008, Rev 4.0

WM8900

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