ROHM BU8872FS, BU8872F Datasheet
192
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.
Applications
Telephone answering machines
Features
1) Dynamic range of 45dB. (internal AGC)
2) 4-bit binary serial data output.
3) Guard time can be controlled through host microcomputer.
4) Input pins equipped with hysteresis. (ACK pin)
5) 4.19MHz ceramic resonator or crystal resonator can
be used.
6) 8-pin DIP package. (BU8872)
16-pin SSOP package. (BU8872FS)
Block diagram
193
Communication ICs BU8872 / BU8872FS
FAbsolute maximum ratings (Ta=25_C)
FRecommended operating conditions (Ta=25_C)
194
Communication ICs BU8872 / BU8872FS
FElectrical characteristics
DC characteristics (unless otherwise noted, Ta=25_C, V
DD=5.0V)
AC characteristics (unless otherwise noted, Ta=25_C, V
DD=5.0V)
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