User's Manual

B‐LINKELECTRONICCO.,LTDinshenzhen 

11

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11:The14

Pinconnecttoantenna,pleaserefertodesigndemand

RT8782 peripheral

circuit design re

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a) Thecurrentof 3.3Vpowersupplymustbe>300mA,itsripple wavemustbe<30mV.TheGND

pinsofmoduleandexternalantennaneedtobeanincorporatedpart.Thegroundplaneshould

belarger,moduleandante nna shouldkeepfarawayfrominterferencesource.

b) Thesixthpinis2.4Ghighfrequencyoutput,coplanarimpedanceoflayoutlinebetweenthispin

toantennainterfaceshouldbe50Ω,wesuggestusearclineorstraightline,andbesidetheline

therewillbegroundplanethatitslengthasshoutaspossible,thelongestlengthisnomore

than50mm.

c) L1,C1,C2constituteaπ‐typenetworkthatwepreset,pleasemakeitclosetoantennainterface,

thisπ‐typenetworkisusedtomatchtheantennaparametersandcontroltheradiation.It

shouldbeadjustedaccordingtotherealconditionwhenbeingused.Normallyyoucanonly

mountL1thatitsparametersare:2.7nH,NP0material.NoneedC3andC4.

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