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參數(shù)資料
| 型號： | SPFBFT00303 |
| 廠商： | Avago Technologies Ltd. |
| 英文描述： | Optical Bidirectional Transceiver for byteflight |
| 中文描述： | 光纖雙向收發(fā)器的byteflight |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 251K |
| 代理商： | SPFBFT00303 |
6
Functional description
TheICcomprisesofthefunctionalgroupsasshownin
detailbelow.
Thefollowingappliesinstandardmode:
LowleveltoDlmeansLEDdriverisactiveandtherefore
theLEDisemittinglight.
Iflightfallsontothephotodiode,theDOdriverbecomes
activeandproduceslowlevelonDO.
Receiver component
The preamplifier in the receive component forms a
current/voltage converter which converts the photo-
currentfromthereceivediodeintoavoltage.Thefunc-
tionalgrouppeakdetectorensuresasignal-dependent
trackingofthereferencevoltageandcompensatesde-
structiveoffsetinfluenceslikedarkcurrentofthepho-
todiode.IntheSleepmode,thereceiveroperatesata
verylowsupplycurrent.Signalwake-upsequencesare
integratedandifthewake-upthresholdisexceeded,the
activemodeisswitchedon.
The DO output stage is a Push /Pull driver (active L,
inactiveH).Thedrivercanbeblockedbythetransmitter
component.
Transmitter component
TheelectricalsignaltoDIisinvertedandsenttotheLED
DriverviaaANDlogicgate.TheLEDdriversuppliesthe
transmitdiodewithatypicalcurrentof30mA(peak).The
drivercanbeblockedbythereceiverpart.
Locking
Toavoidmutualinterferenceduringdatatransfer,trans-
mitter and receiver are mutually locked. During active
levelatitsinput,thefunctionalgroupidentifiedaslock
in the block wiring diagram blocks the other channel.
Thetrailingedgeisdelayedbyt
lock
andthenreleasesthe
correspondingchannel.Switchingcanbere-triggered.
IfHlevelsoccuronbothchannelsatthesametime,the
channeltobeblockedisnotdefined.Ifcontinuouslight
hasbeendetectedbythereceiver,thelockingforthe
transmittingchannelisreleasedtoenabletransmitting
evenduringcontinuouslightsituation.
Alarm
Analarmisdetectedifapulsewithpulselengtht
alarm
is
recognised.Thealarmoutputdriver(OpenDrainLowside)
isthenstaticallyswitchedon.Thedriverisswitchedoffas
soonasaSync-Pulseisregisteredbythereceiver,with
PON and continuous light and in sleep mode. Alarm
detection is only possible if there was a normal sync
pulsereceivedbefore.
Time basis and timer
Aninternaloscillatorestablishesthelocaltimebasisof
themodule.Inordertoachievetherequiredaccuracy,
thefrequencyisindividuallyadjustedoneachdie.This
tuningismadeoncebythechipmanufacturerduringthe
wafermeasurement.
Thetimerunitchecksalldatapulsesfortheirlengthand
distinguishes between sync-pulses, alarm pulses and
continuouslight.Syncandalarmpulsesmustfulfilthe
time conditions stated under topic Operating Condi-
tions.Continuouslightisrecognisedataminimumpulse
duration of typical 11,4
μ
s. For evaluation of continu-
ouslightontime114pulsesoftheinternaloscillatorare
counted.Thetimeofperiodoftheinternaloscillatormay
beevaluatedaccordingtothefollowingformula:
T
osc
=t
cl
/114
t
cl
=continuouslightontime
pulse type
alarm
min
max
duration [ns]
000
1900
100
max. time of period
19,03
1,58
135,48
min. time of period
85,11
80,85
89,36
sync
min
max
3000
900
3100
117,65
113,73
11,57
86,96
84,06
89,86
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相關(guān)代理商/技術(shù)參數(shù) |
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| SPFBFT302 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Optical Bidirectional Transceiver for byteflight |
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