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  1. #1
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    Bias of analogue audio interface of Nokia 30

    Posted by Torbjrn Forsman, torbjorn@datorelektronik.se
    on May 16, 2002 at 12:39

    In the M2M audio application note, a common mode voltage of 1,6 V is specified for the analog audio input.

    Does the Nokia 30 provide that bias by itself, so it is ok to have an AC coupled audio path, or must external equipment generate that bias voltage?

    In the latter case, may the Nokia 30 suffer damage if the bias voltage is active while the module is switched off?

  2. #2
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    RE: Bias of analogue audio interface of Nokia 30

    Posted by Forum Nokia Developer Support,
    on May 17, 2002 at 13:23

    Yes it true that the common mode voltage of 1,6 V is specified for the analog audio input.

    Nokia 30 does not provide bias by itself, so when you are using an AC coupled audio path, you should have an external equipment to generate bias voltage

    In this case, the Nokia 30 should not suffer damage if the bias voltage is active while the module is switched off.

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