SC1240 Datasheet | Shaoxing Silicore Technology

w w telephone sets in connection with an t e ELECTRONIC TWO-TONE RINGER SC1240 e h S a DESCRIPTION Outline Drawing t a The SC1240 are monolithic integrated circuits D . designed to replace the mechanical bell in w electro-acoustical converter. The devices can drive directly a piezocera mic converter (buzzer). The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible across an ou tput a mplifier in the loudspeaker, both tone frequ encies 4U m o .c Silicore and the switching frequency can be externally adjusted. The signal and the circuit is designed so that noise on th e line or variations of the ringing signal cannot affect correct...