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AN6425 - Panasonic Semiconductor

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AN6425 Speech Network Circuit

Pin No. 1 Pin name GND Typical waveform DC 0V Description Ground pin. Connect to the output of the diode bridge. 2V internal stabillized power supply output pin. Connect to GND via 220µF. The current obtainable from this pin is 5mA or less (at IL=20mA). Equivalent circuit 2 2 2V REG DC 2V 2V REG 3 1V REF DC 1V 1V reference coltage output pin. Con.

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.

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