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BU8872FS Datasheet

  • BU8872FS

  • DTMF receiver for telephones

  • 170.06KB

  • 10頁

  • ROHM

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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 time can be controlled through host micro-
computer.
4) Input pins equipped with hysteresis. (ACK pin)
FBlock
diagram
5) 4.19MHz ceramic resonator or crystal resonator can
be used.
6) 8-pin DIP package. (BU8872)
16-pin SSOP package. (BU8872FS)
192

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