■ Features

• Speech network IC for the multifunctional telephone sets

• Capable of interfacing with the light-weight small receivers

and ECM transmitters

• Built-in 2V REG constant voltage source (2V typ) for ECM

• Built-in non-linear circuits in the transmitter and receiver

systems in order to eliminate ambient noises

• Built-in speaker amplifier and capable of driving with a main

wire current

• Built-in hold-tone amplifier, key-in-tone amplifier, and

DTMF transmitter, and capable of setting the mode with the

control pins

• Automatic gain control (automatic pad function) according to

a circuit curret

• Built-in tertiary active filter circuit and capable of sending a

DTMF circuit with much higher harmonic at a low distortion

factor

• Built-in single touch receiver volume-up function (about

6dB)