hi please suggest me a good dtmf chip compatible with 89c51. thanks in advance
Either Transciever or Detector&Generator seperately thanks
look at http://www.holtek.com.tw/english/products/comm_2.htm
go to http://www.zarlink.com/ and type "DTMF" into the 'Search' box...
I have no knowledge on said subject, but everything I have seen uses MT88xx such as MT8870 Erik
"MT88xx such as MT8870" They're Zarlink parts - see URL above