Digital control type astable multivibrator circuit

Published:2011/5/25 20:16:00 Author:Christina | Keyword: Digital control, astable multivibrator | From:SeekIC

As the figure shows, the oscillator is composed of the DAC, the mirror current source and the 555 oscillator. The oscillation frequency is related to the input data size and the control reference voltage. IC1 uses the D/A conversion circuit DAC0800 LCN, this circuit is the 8-bit DAC, it changes the data into the analog signal and adds the signal to the mirror current source VT1's b port, so it controls the VT2's integrated electrode current - 555 oscillator C's charging current, and also changes the frequency of the oscillator.



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