lanovan
Newbie level 6
![Newbie level 6](/styles/images/ranks/blevel3.gif)
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.
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.