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Original question:
ADS54J42: NYQUIST ZONE & CTRL NYQUIST Register setting
Replies: 5
Views: 116
Part Number: ADS54J42
Hello,
This post is related to :
https://e2e.ti.com/support/data-converters/f/73/t/807324?tisearch=e2e-sitesearch&keymatch=ads54j42
[Q]
My customer set the nyquist zone as follows.
0x680042 0x01 //2nd Nyquist zone select or 0x00 // 1st Nyquist zone select0x68004E 0x80 //nyquist enable0x680000 0x01 // reset digital. Must issue after writes to 6800h0x680000 0x00 // clear reset
In this case, how long does it take to become operational after setting that setting ?
This is the information needed to design their software.
Best Regards,
Hiroshi Katsunaga
Hi Hiroshi,
We are looking into this question, and will be back with you soon.
Dan
Hiroshi,
It is better if the Nyquist-zone configuration is added as part of the bring-up configuration, where it is added just before issuing the digital-core-reset. This way no extra wait time is needed.
Changing the setting after the device bring-up will reset the Interleave engine, which then you will have to wait for it to converge, which will take about 150ms.
Regards,
Jim
In reply to jim s:
Hi Jim,
Thank you for your clear comments.
OK, I understood your all comments.
I have an additional question.
[Q]Is there an appropriate order below ?
0x680042 0x01 //2nd Nyquist zone select or 0x00 // 1st Nyquist zone select0x68004E 0x80 //nyquist enable
In reply to Hiroshi Katsunaga:
The order does not matter. None of these settings go into effect until a pulse reset occurs in page 6800h address 0h bit 0.
Pulse reset.pptx
Thank you for your clear comment.
OK, I understand it.
Thank you for your cooperation.