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Ah, hah! The standard dtmf receiver interface chip is the MT8870. Google that for all the info you need. I found that the MT8888C by Zarlink incorporates a dtmf transmitter and an intel micro interface (including the 8051/2) onboard the IC. Under $3, too.
i want a circuit idea about how i can interface telephone line to 89c51....
i actually requires a caller id. and which in turn connected to lcd display and to pc to monitor the calls..... the circuit also have an autoteller facility..