nRF52840: Hardware: "Circuit configuration no. 5" within the document "nRF52840 Objective Product Specification v0.5.1"

[Andy_NTW]

Hello dear community,

I had a question related to the Circuit configuration no. 5 within the document "nRF52840 Objective Product Specification v0.5.1". There are two inductors called L2 = 10µH and L3 = 15 nH. See in figure below.

Question: 

Why there is an inductor L3 of 15 nH? In comparison to the inductor L2 = 10 µH is this L3 negligible. 

Best regards

Andy

[Andreas]

Hi,

 

You should not use OPS v0.5.1, it is valid for an engineering revision of the IC that is no longer available. Please find the latest version here: https://infocenter.nordicsemi.com/topic/ps_nrf52840/keyfeatures_html5.html?cp=3_0_0

 

The 15nH inductor is an RF block, suppressing harmonics generated by the DCDC converter from entering the internal power supply.

 

Best regards,

Andreas

[Andy_NTW]

thx!!!