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Question Regarding VFC waveforms

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km

New Member
Hi, may i asked how could one determined the Peak-to-peak value of the sine and square waves from the figure? Why is the Sine wave amplitude is smaller compare to the Square?
 

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audioguru

Well-Known Member
Most Helpful Member
The output of the MAX7410 is typically -3dB (0.707) at its cutoff frequency and its spec's are from -2.4dB to -3.6dB.

You will break it by exceeding its max input voltage. You are feeding it a 9V square-wave and its absolute max input is its supply voltage plus a tiny amount. I recommend attenuating the input signal to a p-p amount less than its supply voltage to avoid clipping.
 

km

New Member
How does actually the Switched capcitor IC (MAX7410) works to convert the Square to sine? I have no idea. Can somebody please tell me riefly?
 

Roff

Well-Known Member
When you get the input attenuated to fit into the input range of the MAX7410, as Audioguru suggested, the sine wave should actually be 4/pi times the amplitude of the input square wave. If you don't understand why, Google "fourier square wave".
 

Roff

Well-Known Member
km said:
How does actually the Switched capcitor IC (MAX7410) works to convert the Square to sine? I have no idea. Can somebody please tell me riefly?
Here is one explanation.
 
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