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DTMF decoder with MIC

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KaJuan

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Hello...
Can anybody give me a schematic of a DTMF decoder. I already found one but it does not have a mic connected to it. I need a mic connected to my DTMF decoder since I am going to recive teh AUDIO format of the DTMF.


Pls... help
 
I also need information about dtmf decoder.... can someone please post reply.....
plzzzzz I need it....
 
DTMF decoder chip HT9170 - Data-sheet attached
 

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my project is little bit simillar to wireless device controlling....
for this I need FM tx and DTMF encoder...
 
I am building a circuit which needs to transfer data through wireless.
I am confused between RF or FM... which should I go for ?
 
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