lwew96 Posted June 20, 2019 Share Posted June 20, 2019 i have created sine wave 80khz but it is like digital signal . So anyone help me give some IC for reconstruction filter of Pmod DA3. Thank you so much! Link to comment Share on other sites More sharing options...
jpeyron Posted June 20, 2019 Share Posted June 20, 2019 Hi @lwew96, We have not used a reconstruction filter. I did find a paper that discusses a reconstruction filter with the AD5541 here. Hopefully one of the more experienced community members will have some input for you as well. best regards, Jon Link to comment Share on other sites More sharing options...
lwew96 Posted June 21, 2019 Author Share Posted June 21, 2019 tks @jpeyron 4 hours ago, jpeyron said: Hi @lwew96, We have not used a reconstruction filter. I did find a paper that discusses a reconstruction filter with the AD5541 here. Hopefully one of the more experienced community members will have some input for you as well. best regards, Jon Thank you so much! Link to comment Share on other sites More sharing options...
xc6lx45 Posted June 21, 2019 Share Posted June 21, 2019 You could try a 10 ohms series resistor, then a 150 or 180 nF parallel capacitor to ground. Link to comment Share on other sites More sharing options...
lwew96 Posted June 28, 2019 Author Share Posted June 28, 2019 On 6/21/2019 at 12:37 PM, xc6lx45 said: You could try a 10 ohms series resistor, then a 150 or 180 nF parallel capacitor to ground. i Used 3x 1k ohm series resistor and 3x 10 pF capacitor to ground to creat 3-rd low pass filter . The result is below picture. The signal is distorted Link to comment Share on other sites More sharing options...
D@n Posted June 28, 2019 Share Posted June 28, 2019 You are outputting a sinewave, right? At what digital amplitude? Both of these look consistent with quantization noise. Dan Link to comment Share on other sites More sharing options...
hamster Posted June 28, 2019 Share Posted June 28, 2019 10 minutes ago, D@n said: You are outputting a sinewave, right? At what digital amplitude? Both of these look consistent with quantization noise. Dan Dan seems on to something. Are you sure you have a low-pass filter, not a high pass one? Link to comment Share on other sites More sharing options...
xc6lx45 Posted June 28, 2019 Share Posted June 28, 2019 is this 10 ns per division on your scope? This is unlikely to show an 80 kHz sinewave... A picofarad capacitor isn't likely to help. The values I gave are not the only choice but they were calculated for an 80 kHz sine (resulting in a 100 kHz or 88 kHz cutoff frequency). Link to comment Share on other sites More sharing options...
Question
lwew96
i have created sine wave 80khz but it is like digital signal .
So anyone help me give some IC for reconstruction filter of Pmod DA3.
Thank you so much!
Link to comment
Share on other sites
7 answers to this question
Recommended Posts
Archived
This topic is now archived and is closed to further replies.