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SIM300cz audio interface

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lanovan

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I'd like to connect sim300cz's mic & speaker interface to a codec. the codec has mic and speaker pins. So I connect these two pins of both modules, i.e, mic to speaker and vice versa.
But, I'm not sure about the voltage level compatibility between these pins.
When I read sim300cz's datasheet, I get little confused. I read the Audio interface section, reference electronic characteristics.
It says that:
MIC input: working voltage:min 1.2v, max 2v
Normal output SPK1: ref level: 1.0954v, -6.02 dBm

can anyone explain these data, what is the meaning of working voltage and ref level in above?
Thanks.
 

oh sorry. Here's data sheet of sim300cz
 
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    zeilja

    zeilja

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In my design, i use vbat for sim300cz = 4v
the codec i use is wm8510 and has analog supply 3.3v.
can anyone tell me the range of voltage for mic and speaker interface in sim300cz?
can I connect the audio interface of both module directly?
Here's the datasheet of wm8510
 

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