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AFBR-707SDZ Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-707SDZ Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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3 / 19 page  3 Figure 1. Transceiver functional diagram Transmit Fault (TX_FAULT) A catastrophic laser fault will activate the transmitter signal, TX_FAULT, and disable the laser. This signal is anopencollectoroutput(pull-uprequiredonthehost board). A low signal indicates normal laser operation and a high signal indicates a fault. The TX_FAULT will belatchedhighwhenalaserfaultoccursandiscleared bytogglingtheTX_DISABLEinputorpowercyclingthe transceiver.Thetransmitterfaultconditioncanalsobe monitoredviathetwo-wireserialinterface(addressA2, byte110,bit2). LIGHT FROM FIBER LIGHT TO FIBER PHOTO-DETECTOR RECEIVER AMPLIFICATION & QUANTIZATION RD+ (RECEIVE DATA) RD– (RECEIVE DATA) RX_LOS VCSEL TRANSMITTER LASER DRIVER & SAFETY CIRCUITRY TX_DISABLE TD+ (TRANSMIT DATA) TD– (TRANSMIT DATA) TX_FAULT ELECTRICAL INTERFACE SDA SCL MOD-ABS CONTROLLER & MEMORY OPTICAL INTERFACE RS0 RS1 Transmitter Section The transmitter section includes the Transmitter Opti- calSub-Assembly(TOSA)andlaserdrivercircuitry.The TOSA,containinganAvagodesignedandmanufactured 850 nmVCSEL (Vertical Cavity Surface Emitting Laser) lightsource,islocatedattheopticalinterfaceandmates withtheLCopticalconnector.TheTOSAisdrivenbyan ICwhichusestheincomingdifferentialhighspeedlogic signaltomodulatethelaserdiodedrivercurrent.ThisTx laserdrivercircuitregulatestheopticalpoweratacon- stantlevelprovidedtheincomingdatapatternisDCbal- anced. Transmit Disable (TX_DISABLE) The AFBR-700SDZ accepts an LVTTL compatible trans- mitdisablecontrolsignalinputwhichshutsdownthe transmitteropticaloutput.Ahighsignalimplementsthis functionwhilealowsignalallowsnormaltransceiverop- eration.Intheeventofafault(e.g.eyesafetycircuitac- tivated),cyclingthiscontrolsignalresetsthemoduleas depictedinFigure6.Aninternalpullupresistordisables thetransceivertransmitteruntilthehostpullstheinput low.TX_DISABLEcanalsobeassertedviathetwo-wire interface(addressA2h,byte110,bit6)andmonitored (addressA2h,byte110,bit7). ThecontentsofA2h,byte110,bit6arelogicOR’dwith hardwareTX_DISABLE(contact3)tocontroltransmitter operation. |
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