Communication ICs DTMF receiver for telephones BU8872 / BU8872FS The BU8872 and BU8872FS are DTMF receiver ICs developed for use in telephone answering machines, and convert 16 different types of DTMF signals into 4-bit binary serial data.
In addition to a compact 8-pin DIP (BU8872) or 16-pin SSOP (BU8872FS) package, these receivers feature a wide dynamic range, eliminating the need for an external input amplifier.
Expertise from a number of companies has been incorporated into these products to enable guard time control through a host microcomputer.
FApplications Telephone answering machines FFeatures 1) Dynamic range of 45dB.
(internal AGC) 2) 4-bit binary serial data output.
3) Guard tim...

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