Basic_IC_waveform_generator

Published:2009/7/25 3:52:00 Author:Jessie | From:SeekIC

This circuit uses an XR-205 to provide sine, square, triangle, ramp and sawtooth output waveforms, which can be both amplitude and frequency modulated. Electrical characteristics and functional circuits of the XR-205 are shown in Figs. 5-28B and 5-28C, respectively. The operating frequency is set by capacitor Co between pins 14 and 15. With the sweep input open-circuited, the output frequency: f0 (in Hz) =400/C0 (inμF). The Rj pot between pins 7 and 8 adjusts the waveform. The Rq, pot at pin 4 sets the amplitude. For a triangle output at pins 1 and 2 (or pin 11 if the internal buffer is used), both S1 and S2 are open and S3 is closed. For a sine output, open S2, close S1 and S3, adjust Rj for minimum harmonic distortion, and Rq for a maximum output of about ± 3 Vpp. For a sawtooth output, open S1, close S2/S3. For a ramp output at pin 11 (of about 1.4 Vpp) open S3. The ramp duty cycle is controlled by RB across pins 13-14 or 13-15 (duty cycle decreases as RB is decreased). See Conditions in Fig. 5-28B.



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