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LINEAR INTEGRATED CIRCUIT
PRELIMINARY DATA
TELEPHONE SPEECH CIRCUIT WITH MULTIFREOUENCY TONE GENERATOR INTERFACE
The LS156 is a monolithic integrated circuit in 16-lead dual in-line plastic package to replace the hybrid circuit in telephone set. It works with the same type of transducers for both transmitter and receiver (typically piezoceramic capsules, but the device can work also with dynamic ones). Many of its electrical characteristics can be controlled by means of external components to meet different specifications. In addition to the speech operation, the LS156 acts as an interface for the MF tone signal (particularly for M761 C/MOS frequency synthesizer). The LS156 basic functions are the following:
It presents the proper DC path for the line current.
LS156 Datasheet
