Hi,

We are using the HSDC port of ADE7878 in order to acquire samples for a 50hz signal. We do our own FFT calculus with these samples and we obtain the fundamental values. Everything works fine.

Now, due to a new client, we need to do the same but with a 60Hz signal. I know that the sampling rate of ade7879 is 8KSPS, and this rate works fine with 50Hz but not with 60Hz, so we cannot do the FFT calculus for a 60Hz signal. However, the ade7878 has a frequency setting (for 50Hz or 60HZ), I would like to Know how the ade7878 do the rms calculus for 60 Hz if the sampling rate is not a multiple of 60Hz.

If there is no possibility to use the samples of ade7878 for doing a 60Hz FFT. Is there any IC in the Analog portfolio just to obtain samples by an HSDC por at a sampling rate multiple of 60Hz. I have not find any. The HSDC port is perfect for our pourposes because we collect the samples automatically in the DMA through the SPI interface of our microcontroller.

Best regards,.

Hi eukeni

Are you using a crystal or an external clock? If you are using an external clock, you can adjust the output data rate by varying the crystal clock frequency. Say, if your clock frequency was 16.46592MHz, then the output data rate would be 2048 times lower->8040, instead of 8000. So, you would get 134 samples per line cycle. Does this make sense?

Regards

hmani