ROHM BU8871F Datasheet
Communication ICs
DTMF receiver for telephones
BU8871F
The BU8871F is a DTMF receiver ICs developed for use in telephone answering machines, and converts 16 different
types of DTMF signals into 4-bit binary serial data. It features 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 microcontroller.
Block diagram
4) Input pins equipped with hysteresis. (ACK pin)
5) 4.19MHz crystal resonator can be used.
180
Communication ICs BU8871F
FAbsolute maximum ratings (Ta=25_C)
FRecommended operating conditions (Ta=25_C)
FPin descriptions
181
Communication ICs BU8871F
Input / output circuits
182
Communication ICs BU8871F
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)
183
Loading...