DTMF receiver for telephones

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.

Features

1) Dynamic range of 45dB. (internal AGC)

2) 4-bit binary serial data output.

3) Guard time can be controlled through host microcontroller.

4) Input pins equipped with hysteresis. (ACK pin)

5) 4.19MHz crystal resonator can be used.

Applications

Telephone answering machines

BU8871F属于集成电路（IC） > 电信。罗姆半导体集团制造生产的BU8871F电信电信接口集成电路 (IC) 为通信网络接口提供特定功能和控制，例如以太网切换、线路驱动器、ISDN、放大器、通道扩展器、数字锁相环、DTMF、音频发生器和解码器、回声消除、检测器和发生器、DDA、电话线路监控器和主叫号码标识。