Voice Switched Speaker-phone Circuit

The UTC MC34118 voice switched speaker-phone integrated circuit incorporates the necessary Amplifiers Attenuators level detectors and control algorithm to form the heart of a high quality hands-free speaker-phone system. It includes a Microphone Amplifier with adjustable gain and mute control. Transmit and Receive Attenuators which operate in a complementary manner, level detectors at both input and output of both Attenuators and background noise monitors for both the transmit and receive channels. A dial Tone detector prevents the dial Tone from being attenuated by the receive background noise monitor circuit. Also two line driver Amplifiers which CAN be used to form a hybrid network in conjunction with an external coupling transformer. A high-pass Filter CAN be used to Filter out 60Hz noise in the receive channel, or for other filtering functions. A chip disable pin permits powers down the entire circuit to converse power on long loops where loop current is at a minimum. The UTC MC34118 may be operated from a power supply, or it CAN be powered from the telephone line, requiring typically 5mA. The UTC MC34118 CAN be interfaced directly to TIP and RING( through a coupling transformer) for stand-alone operation, or it CAN be used in conjunction with a handset speech network and/or other features of a feature phone. By LianShun Electronics Co., Ltd
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MC34118 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
MC34118 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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