nRF52840 - stability and tempco of RESN and RESP in SAADC

RE: nRF52840 - stability and tempco of RESN and RESP in SAADC

Salas — Wed, 26 Feb 2020 01:55:15 GMT

Hi Andreas,

Please help to close the case. I couldn't find the "Close Case" button in this ticket.

Regards

Salas

RE: nRF52840 - stability and tempco of RESN and RESP in SAADC

Salas — Tue, 25 Feb 2020 02:18:57 GMT

Hi Andreas,

Thank you for your response.

Yes, you are right that they should be 160 kOhm, my typing mistake. How about the temperature coefficient?

Regards

Salas

RE: nRF52840 - stability and tempco of RESN and RESP in SAADC

Andreas — Mon, 24 Feb 2020 14:28:01 GMT

Hi,

Reply from our designer:

I think that should be 160 kOhm. The absolute value of this resistance should be expected to vary greatly (+- 20%) between device, it also has a temperature coefficient. However, the matching between RESP and RESN should be on the order of 1 %.

Best regards,

Andreas

RE: nRF52840 - stability and tempco of RESN and RESP in SAADC

Andreas — Mon, 24 Feb 2020 08:39:36 GMT

Hi Salas,

I will forward the inquiry internally and get back to you.

Best regards,

Andreas