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IL34118 Datasheet PDF


Part Number IL34118
Manufacturer ETC
Title Voice Switched Speakerphone Circuit
Description ...
Features ...

File Size 632.62KB
Datasheet IL34118 PDF File








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IL34118 : INTRODUCTION The fundamental difference between the operation of a speakerphone and a handset is that of half-duplex versus full-duplex. The handset is full duplex since conversation can occur in both directions (transmit and receive) simultaneously. A speakerphone has higher gain levels in both paths, and attempting to converse full duplex results in oscillatory problems due to the loop that exists within the system. The loop is formed by the receive and transmit paths, the hybrid, and the acoustic coupling (speaker to microphone). The only practical and economical solution used to data is to design the speakerphone to function in a half duplex mode - i.e., only one person speaks at a time,.

IL34119 : Pin 1 2 3 Symbol CD FC2 FC1 Description Chip Disable - Digital input. A Logic “0” (0.8 V) sets normal operation. A Logic “1” (≥2.0 V) sets the power down mode. Input impedance is nominally 90 KΩ. A capacitor at this pin increases power supply rejection, and affects turn-on time. This pin can be left open if the capacitor at FC1 is sufficient. Analog Ground for the amplifiers. A 1.0 µF capacitor at this pin (with a 5.0 µF capacitor at Pin 2) provides 52 dB of power supply rejection. Turn-on time of the circuit is affected by the capacitor on this pin. This pin can be used as an alternate input. Amplifier input. The input capacitor and resistor set low frequency rolloff and input impedance. T.

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