内容参考成果jingqiu bestone a99 mt6628 pcb review

MT6628MT6628ReviewSchematicDesigncheckcheckpinname&pinPNisin WiFi/BTGPSDualSAWPNisin WiFi/BT/GPSSingle预留secondsourceGPSexternal需要提醒客户加加external供电请使用MT6628PNisin如果使用MT6628T，GPSRF(A7/A6)路可以全部NC.可以使用XtalorCo-clockwithReviewResult：CheckCopyright©MediaTekInc.Allrights MT6628ReviewSchematicDesignCheckListPNisinQVL，MT6628T搭配Xtal供电使用MT6628使用2ppmTCXO+MT6628Q之前，请阅读ApplicationNote关于2ppm和0.5ppmMT6628TCo-clock目前只能搭配MT6162，MT6163/AST3001/MT6167。OSC_EN连接BBSRCLKENAI（中间必须串4.7K，并9.1K分压）,OSC_IN连接MT6162RFECLK3。MT6168请参考referencedesignReviewResult：CheckCopyright©MediaTekInc.Allrights MT6628ReviewSchematicDesignCheckList(PowerSource请使用BB的2.8V，可以settingDefaultPD的GPIO，需要使用910K请使用BB的2.8VVRTC电感Max电流大于DVDDIO全部拉成1V8，建议使用系统VIO18DVDDIO_SDIO：目前referencedesign使用2V8供电，相对应BBSDIO也供DVDDIO_SDIO如果使用1V8供电，相对应BBSDIO也供1V8，SWSDIODriving需要调整（升高SDIO_CLK/SDIO_CMD各需要预留0ohm，靠近MT6628放臵，用于需要加10K电阻下拉，用来选择GPS/BT/FMReview如，vbat上请加0ohm电阻Copyright©MediaTekInc.Allrights MT6628ReviewSchematicDesignCheckListMT6628pin默认BBSDIO内部有47KBT/GPS/FMinterfaceTX/RXBTdatainterface，PCMIN/OUTFMRXaudiodigitalFMRXaudiooginterface,每路需要51K下拉，靠近BB。MT6320BB1V8BT/GPS/FMBB1V8ReviewResult：CheckCopyright©MediaTekInc.Allrights MT6628ReviewSchematicDesignCheckListMT6628pinConnectto连接BB1V8GPS_SYNC,（75/77/15/17EINT4orMT6628‘ssystemreset2.8V32KHzclock默认MT6628SDIOpower，与BBSDIO对应Power一ReviewResult：CheckCopyright©MediaTekInc.Allrights MT6628ReviewSchematicDesignCheckList(RFMT6628pinWiFi/BT6628只有TDD。BulunorBulunFilter如果是和GPS单天线，就只能使用单独Bulun，双天线建议使用BulunFMRX建议使用FPCFMRX使用耳机地当天线，FM_ANT路径靠近耳机接口端需要预留TVS管，CpF<5pF匹配（默认串27nh，并10GPS需要外加LNA+SAW。如果是和WIFI共天线，使用了LTCCDiplexer，SAW如果使用SAWDiplexer，需要预留一个SAW作为2ndsourceReview使用耳机地当天线，FM_ANT路径靠近耳机接口端需要预留TVSCpF<5pF，需要匹配（默认串27nh，并10Copyright©MediaTekInc.Allrights MT6628ReviewSchematicDesignCheckListMT6628pinANTSEL0留测点，ANTSEL1预留上拉至AVDD28_TLDO_SW位臵，ANTSEL2BulunBulunDC采用WFLDO如果使用Xtal、Co-clock，ANTSEL1需要10k上拉至ReviewResult：CheckCopyright©MediaTekInc.Allrights MT6628ReviewPCBDesignCheck Review 尺寸如右上图，不建议全部挖空，表层至第一个主地即可。和2/3GPA距离Copyright©MediaTekInc.Allrights MT6628BulunLayoutReviewReviewCopyright©MediaTekInc.Allrights MT6628MT6628FMLANTRFReviewBead之前需要有ESD器件（Cpf<5 ReviewFM_ANT上预留一个0ohmBead之前需要有ESD器件（Cpf<5pf） Copyright©MediaTekInc.Allrights MT6628ReviewPCBDesignCheckOUTBK(J2):CLDO(K2):LDO(J1):TLDO_SW(H1):ReviewWF_PA_LDO(L4):VBATinputLXBK(L3):20OUTBK(J2):Copyright©MediaTekInc.Allrights MT6628ReviewPCBDesignCheckRFcontrol,whichiscloseto50ohmThematchingBOMsshouldbecedasclosetochipaspossibleforbetterRFRFtracesrouteonthesurfacelayerandfarawayfromotherhighspeedsignaltracemended,Digitaltraceshouldn’tgothroughdirectlyunderRFtraceRFtracebelowshouldhavesolidgroundKeeptheFM_RX_NandFM_RX_PindifferentialtracetoconnecttoaudiojackReviewCheckok，请注意50ohmCopyright©MediaTekInc.Allrights MT6628ReviewPCBDesignCheckPower cedasclosetochipaspossibleandusingSMDtype2.2uHbulkouttoavoidtode-senseFMReviewCopyright©MediaTekInc.Allrights MT6628ReviewPCBDesignCheckOtherGiveGNDviaasmoreaspossibleforMT6628ineachTCXO/Xtal26MHzclocktracemustbeenclosedbyReviewSDIO的6根线请走在一起，CLK6根线需要走等长，差异最好不要超过长度的Copyright©MediaTekInc.Allrights MT6628ReviewPCBDesignCheckOtherReviewCheckCopyright©MediaTekInc.Allrights MT6628ReviewCheckOther ,FMDe-sense:AddaLPF(chipoutseries27nH,thanparallel10pF)onFMlongFMDe-sense:add1nFbypasscapatexternalclassDamplifierexternalboost