IC_VCO_with_multi_channel_FSK_operation

Published:2009/7/25 4:12:00 Author:Jessie | From:SeekIC

This circuit is similar to that of Fig.5-36.except that the XR-2207 is connected for square and triangle FSK outputs，Mark and space frequencies f1 and f2 are selected by the choice of R1 through R3 and C，as shown by the equations of Fig.5-36D The keying signal is applied at pin 9.If only a single FSK channel is used connect pin 8 to V＋or ground, and omit the remaining timing resistors.Notice that f1 and f2 can be fine tuned using the pots. Set f1 first with pin 9 low.Because frequency stability is related directly to the timing components, use parts with low Tc. Typical drift for 0℃ to 75℃ is± 0.2%.



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