Published:2009/7/25 4:00:00 Author:Jessie | From:SeekIC
This circuit is similar to that of Fig. 5-31, except that the XR-2206 is connected for sine FSK outputs. Mark and space frequencies f1 and f2 are selected by the choice of R1, R2, and C, as shown by the equation. The output is phase-continuous during transitions. The keying signal is applied at pin 9. The circuit can be converted to split-supply operation by replacing ground with V-.R3 sets the FSK output amplitude.
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