Arcam RCUBE - Product Overview; Views of the rCube; Key Components

RFAMPcontinue
TheRFstageisbothReceiveorTransmit(transceiver)allowingCubestobelinkedfordocked
iPodsourceandexternalanalogueinputshenceyouwillseetwospatepathsthatareswitched
R.FswitchesseenasIC701IC702IC703twoseparateAntennaareusedandtherCubehasthe
abilitytoselectthemoststableaerialatanygiventimetheaudiopathinto/outoftheKleer
chipisseenasKL3012regardlessofstatus–wheninreceivemodetheRFpowerampis
bypassedbyIC701,IC702intransmissionmodebothswitchesaretoggledtobringtheSaw
filterFL700andLowRFPassfilterFL701withPowerAmpIC704backinline,Thetwoantenna
areconnectedtothesurfacemountsocketsatSKT700anSKT701.
DACFiltersandAmplifiers
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AudioarrivetheDACfiltersandAmplifierscircuitfromtheDSPas4separatechannelsthese
beingTWEET_L/TWEET_R/WOOF_L/WOOF_Reachchanneltravelthruanidenticalfilter
circuitTWEET_Lchannelwillbedescribed.
TWEET_RaudioarriveatcapacitorC508beforetravelingintothefilterbasedaroundthe
NJM2114at
locationIC500theaudioisfurtherfilteredbythenetworkofcapacitorsbased
aroundC326andC327incombinationwithC510–audiothenpassesintotheVolumecontrol
ICatlocationIC501onpin1andcanbeseentoexit(volumeadjusted)onpin14–thevolume
controlisundercontrolofthemainmicroatpositionU302vialineVOL_CLK/VOL_DATtheline
willknowbeknownasTWEET_VOL_RandtravelsintothePowerampchipatlocationIC507
(sharedwithTWEET_VOL_L)thispackageisdrivenfromthe+19v_ampsupplyandisthermally
protecttotriggerat100c/standbyandmutecontrolcomesfromthemainmicroandtemp
statusofthepowerampcanbereportedtobacktothemicro.
TheWOOF_VOL_LandWOOF_VOL_Raudiopathsuseabridgedpowerampeachseenat
locationsIC504andIC05.
Displayandkeyboard
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ThedisplayboardisconnectedtothemainboardviatheiPodheaderboardandit’sprimary
linkonthemainboardismainmicroU301.
TheboardisbuiltaroundtheIC1aAT42QT10606‐channelsensorICthisallowsforcapacitive
sensorsaskeysandalsoperformtheroleofdrivingthetopplateLED’swithexceptionof
StandbyLEDstatusred(thiscomesdirectlyfromU301)thechipissuppliedbythe3V14STBY
powersupply,theresetcircuitshownonthecircuitwasnotrequiredbythefinaldesign.
AllLEDsaredrivenfromthe+5_DISrail
apartfromstandby(red)asthisisonthe3V14(STBY)
rail.