ADS1299-4: Question about ADS1299-4 digital power range.

Kazuya Nakai59

Guru 20780 points

Part Number: ADS1299-4
Other Parts Discussed in Thread: ADS1292R, ADS1298R

Hello guys,

One of my customers is considering using ADS1299-4 for their new products.

At this moment, they have the following question.
Could you please give me your reply?

Q.
ADS1299-4 datasheet says that Digital power supply is 1,8V(Min), 1.8V(Nom), 3.6V(Max).
The customer apply 1.8V to ADS1299-4 as the digital power supply because another logic circuits uses 1.8V.
This voltage may be lower a little than 1.8V depend on production variation.
If the digital power supply voltage is just a little below 1.8V, will ADS1299-4 digital operation stop?

Also why are the nominal and the minimum voltage same?

Your reply would be much appreciated.

Best regards,
Kazuya.

7 months ago

0 Ryan Andrews 6 months ago

TI__Guru 62726 points

Hi Kazuya-san - please excuse our delay. Do you still need help with this?

Regards,

Ryan

0 Kazuya Nakai59 6 months ago in reply to Ryan Andrews

Guru 20780 points

Hi Ryan,

Thank you very much for your reply and I'm sorry to be late my response.

Yes, it is very helpful for the customer and me if you answer to the question.

Thank you and best regards,
Kazuya.

0 Ryan Andrews 6 months ago in reply to Kazuya Nakai59

TI__Guru 62726 points

Hi Kazua-san,

As long as the DVDD supply is within 100 mV of 1.8 V, I would still expect the digital core and interface to work properly. It is strange to see the minimum and nominal values listed as the same in the data sheet. Other ADS129x devices (ADS1292R, ADS1298R) show a nominal DVDD supply voltage of 1.8 V and a minimum of 1.65 V to 1.7 V.

Regards,

Ryan

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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ADS1299-4: Question about ADS1299-4 digital power range.