AN6425K 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)
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