ADS54J42: How long does it take to become operational after setting NYQUIST_ZONE ?

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Hiroshi Katsunaga

Replies: 5

Views: 70

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 select
0x68004E 0x80 //nyquist enable
0x680000 0x01 // reset digital. Must issue after writes to 6800h
0x680000 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

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Expert 8540 points

dBrock
- Oct 21, 2019 12:32 PM
Hi Hiroshi,

We are looking into this question, and will be back with you soon.

Best Regards,

Dan
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Guru 54040 points

jim s
- Oct 22, 2019 1:36 PM
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
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Hiroshi Katsunaga
- Oct 23, 2019 6:50 AM
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 select
0x68004E 0x80 //nyquist enable

Best Regards,

Hiroshi Katsunaga
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jim s
- Oct 23, 2019 11:25 AM
In reply to Hiroshi Katsunaga:

Hiroshi,

The order does not matter. None of these settings go into effect until a pulse reset occurs in page 6800h address 0h bit 0.

Regards,

Jim

Pulse reset.pptx
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Hiroshi Katsunaga
- Oct 24, 2019 3:21 AM
In reply to jim s:

Hi Jim,

Thank you for your clear comment.

OK, I understand it.

Thank you for your cooperation.

Best Regards,

Hiroshi Katsunaga
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ADS54J42: How long does it take to become operational after setting NYQUIST_ZONE ?

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