This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS54J42: NYQUIST ZONE & CTRL NYQUIST Register setting

Part Number: ADS54J42


My customer has a question about ADS54J42.


Please tell me the proper setting for NYQUIST ZONE and CTRL NYQUIST.

<Their configuration>

* Input Frequency Range = 75MHz to 475MHz (this is narrow band signal) 

* Sampling Rate = 500MSPS

<My understanding>

* CTRL NYQUIST is always 1.

* Input Frequency < 250MHz, then NYQUIST ZONE = 000

* 250MHz <= Input Frequency < 500MHz, then NYQUIST ZONE = 001

Is my understanding correct ?


There is no such setting in AFE54Jxx GUI.

Is this setting required ?


What does this change?

I understand ADS54J42 is 4 interleaving ADC.

Therefore it will produce interleaving spurs. (DC, fs/4, fs/2 at no input, fs/4 +/- input frequency, fs/2 - input frequency at signal input)

Best Regards,

Hiroshi Katsunaga