WM8940 Wolfson Microelectronics Ltd., WM8940 Datasheet

WM8940

Manufacturer Part Number

WM8940

Description

Mono Codec with Speaker Driver

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8940.pdf (85 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

WM8940CGEFL/RV

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RENESAS

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201

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DESCRIPTION

The WM8940 is a low power, high quality mono CODEC

designed for portable applications such as digital still cameras

or camcorders.

The device integrates support for a differential or single ended

mic, and includes drivers for speakers or headphone, and

mono line output. External component requirements are

reduced as no separate microphone or headphone amplifiers

are required.

Advanced Sigma Delta Converters are used along with digital

decimation and interpolation filters to give high quality audio at

sample rates from 8 to 48ks/s. A selectable high pass filter

and four fully-programmable notch filters are available in the

ADC path. An advanced mixed signal ALC function with noise

gate is provided, while readback of PGA gain during ALC

operation is supported. The digital audio interface supports A-

law and µ-law companding.

An on-chip PLL is provided to generate the required Master

Clock from an external reference clock. The PLL clock can

also be output if required elsewhere in the system.

The WM8940 operates at supply voltages from 2.5 to 3.6V,

although the digital supplies can operate at voltages down to

1.71V to save power. Different sections of the chip can also be

powered down under software control using the selectable two

or three wire control interface.

WM8940 is supplied in a very small 4x4mm QFN package,

offering high levels of functionality in minimum board area,

with high thermal performance.

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Mono CODEC with Speaker Driver

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FEATURES

•

OTHER FEATURES

•

APPLICATIONS

•

Mono CODEC:

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

DAC SNR 98dB, THD -84dB (‘A’-weighted @ 8 – 48ks/s)

ADC SNR 94dB, THD -80dB (‘A’-weighted @ 8 – 48ks/s)

On-chip Headphone/Speaker Driver

Additional MONO Line output

Multiple analog or ‘Aux’ inputs, plus analog bypass path

Mic Preamps:

Differential or single end Microphone Interface

Low-noise bias supplied for electret microphones

Digital Playback Limiter

Programmable high pass filter (wind noise reduction)

4 notch filters (narrowband noise suppression)

On-chip PLL

Low power, low voltage

4x4x0.9mm 24 lead QFN package

Digital still cameras and camcorders

General purpose mono audio CODEC

40mW output power into 16Ω

BTL speaker drive 0.4W into 8Ω

Programmable preamp gain

Pseudo differential inputs with common mode rejection

Programmable ALC / Noise Gate in ADC path

2.5V to 3.6V (digital: 1.71V to 3.6V)

Pre-Production, Rev 3.0, February 2007,

WM8940

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