TWO_INPUT_FSK_MULTIPLEXER

Published:2009/7/7 5:15:00 Author:May | From:SeekIC

Uses Signetics NE571 or NE570 analog compandors. Gain of each channel is unity, as determined by RGAIN value for channel. When complementary control signals are provided, FSK generator switches between the two signal inputs. Outputs, when on, are summed by opamp in IC. Each channel is gated off by low control logic input. For FSK or alternate-channel ';'' C0N-TR0L A and CONTROL B signals should be com plementary. Control signal suppression is optimized with chopper null pot. Suppression is better than 60 dB after trimming. Circuit can also be used as summing switch, with both signals on at any given instant.-W. G. Jung, Gain Control IC for Audio Signal Processing, Ham Radio, July 1977, p 47-53.



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