nRF52840 SAADC Input Stage

[ThePinkPanther]

Hi,

We are using the nRF52840 SoC.

1. The following image is taken from the datasheet:

It shows a Gain block before the SAR core

a. Does the Gain block serve also as a buffer?

b. What is the Gain BW?

 

1. The following image describes a simplified SAADC sample network:

- Does the Rsource external to the nRF52840 SoC?

 

Thank you

[Jørgen Holmefjord]

Hi,

Does the Gain block serve also as a buffer?

This is a simplified block diagram. There are input buffers between the MUX and the SAR core.

What is the Gain BW?

I'm not sure we have any parameters for this. Can you elaborate more on what you are looking for?

Does the Rsource external to the nRF52840 SoC?

Yes, this is the external source resistance.

Best regards,
Jørgen

[Jørgen Holmefjord]

Sorry for the slow reply. I will check your questions with the SAADC developers. I will get back to you as soon as I receive their response.