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FSK_DEMODULATOR_WITH_CARRIER_DETECT

2017-01-18 21:08  
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FSK_DEMODULATOR_WITH_CARRIER_DETECT
FSK_DEMODULATOR_WITH_CARRIER_DETECT
FSK_DEMODULATOR_WITH_CARRIER_DETECT
Exar XR-2211 FSK demodulator operating with PLL provides choice of outputs when carder is present; pin 5 goes low and pin 6 goes high when carrier is detected. With pins 6 and 7 connected, output from these pins provides data when FSK is applied but is low when no carrier is present. Circuit performance is independent of input signal strength over range of 2 mV to 3 VRMS. Center frequency is 1/C1R4 Hz, with values in farads and ohms. Choose frequency to fall midway between mark and space frequencies. Used in transmitting digital data over telecommunication I inks.- Phase-Locked Loop Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 57-61.