Description

LS1240 is a monolithic integrated circuit designed to replace the mechanical bell in telephone sets in connection with an electro-acoustical converter. It can drive directly a piezoceramic converter (buzzer) or a dynamic loudspeaker.

The output current capability of LS1240 is higher than the one of a standard ringer. To drive a dynamic loudspeaker LS1240 can simply use a decoupling capacitor, thus eliminating the usual transformer.

No current limitation is provided on the output stage of LS1240, so a minimum load DC of 50 Ω is advised, in series with a proper capacitor.

Features

■ Low current consumption, in order to allow the parallel operation of 4 devices

■ Integrated rectifier bridge with zener diodes to protect against over voltages little external circuitry

■ Tone and switching frequencies adjustable by external components

■ Integrated voltage and current hysteresis

E-LS1240A属于集成电路（IC） > 电信。意法半导体（ST）集团制造生产的E-LS1240A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。