WM8510 datasheet(13/56 Pages) WOLFSON

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WM8510

PP Rev 1.2 December 2004

DEVICE DESCRIPTION

INTRODUCTION

The WM8510 is a low power audio codec combining a high quality mono audio DAC and ADC, with

flexible line and microphone input and output processing. Applications for this device are anticipated

to include VoIP telephones, digital telephones, conference speaker phones and mobile hands-free

kits.

FEATURES

The chip offers great flexibility in use, and so can support many different modes of operation as

follows:

MICROPHONE INPUTS

Two microphone inputs are provided, MICP/MICN and MIC2, allowing for either a pseudo-differential

microphone input or a single ended microphone to be connected.

These inputs have a user

programmable gain range of -12dB to +35.25dB using internal resistors. After the input PGA stage

comes a boost stage which can add a further +20dB of gain. A microphone bias is output from the

chip which can be used to bias the microphones. The signal routing can be configured to allow

manual adjustment of mic levels, or to allow the ALC loop to control the level of mic signal that is

transmitted.

Total gain through the microphone paths of up to +55.25dB can be selected.

FLEXIBLE MIC2 INPUT

The flexible configuration of the mono input, MIC2, with integrated on-chip resistors allows several

analogue signals to be summed into the single input if required. This can be used as a microphone,

line input or an input for warning tones (beep) etc. The output from this circuit can be summed into

the mono output and/or the speaker output paths, so allowing for mixing of audio with ‘backing music’

etc as required.

SIDETONE ATTENUATION

A bypass path allows analog signals to travel directly to the outputs without passing through the ADC

and DAC. For side tone features in telephone handsets this analog bypass can be attenuated.

PGA AND ALC OPERATION

A programmable gain amplifier is provided in the input path to the ADC. This may be used manually

or in conjunction with a mixed analogue/digital automatic level control (ALC) which keeps the

recording volume constant.

ADC

The mono ADC uses a multi-bit high-order oversampling architecture to deliver optimum

performance with low power consumption. Various sample rates are supported, from the 8ks/s rate

typically used in voice dictation, up to the 48ks/s rate used in high quality audio applications.

HI-FI DAC

The hi-fi DAC provides high quality audio playback suitable for all portable mono audio type

applications.

DIGITAL FILTERING

Advanced Sigma Delta Converters are used along with digital decimation and interpolation filters to

give high quality audio at sample rates from 8ks/s to 48ks/s.

Application specific digital filters are also available which help to reduce the effect of specific noise

sources such as ‘wind noise’.

The filters include a programmable ADC high pass filter and a

programmable ADC notch filter.

OUTPUT MIXING AND VOLUME ADJUST

Flexible mixing is provided on the outputs of the device; a mixer is provided for the speaker outputs,

and an additional mono summer for the mono output. These mixers allow the output of the DAC, the

output of the ADC volume control and the MIC2 input to be combined. The output volume can be

adjusted using the integrated digital volume control and there is additional analogue gain adjustment

capability on the speaker output.

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