Hi,
I have a board that outputs a ramp signal at 30Hz as per the attached schematic. when I zoom into the signal at about 100mV scale, I can see this sinusoidal noise at my clock frequency. The digital inputs for AD7533 are from a 74VHC4040 IC and my clock frequency is at 15KHz.
The attached picture (Pic1) shows the noise at 100Mv amplitude scale and lower channel3 shows the clock. Pic2 shows it at a zoomed out scale of 5V. I am sure there are many factors that could result in this kind of output, but would like to know if there is something that's basic that I am not doing right here.
Let me know if I can provide anymore details to better understand the problem.
thanks
I have a board that outputs a ramp signal at 30Hz as per the attached schematic. when I zoom into the signal at about 100mV scale, I can see this sinusoidal noise at my clock frequency. The digital inputs for AD7533 are from a 74VHC4040 IC and my clock frequency is at 15KHz.
The attached picture (Pic1) shows the noise at 100Mv amplitude scale and lower channel3 shows the clock. Pic2 shows it at a zoomed out scale of 5V. I am sure there are many factors that could result in this kind of output, but would like to know if there is something that's basic that I am not doing right here.
Let me know if I can provide anymore details to better understand the problem.
thanks