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AFCT-5179AZ Datasheet(PDF) 4 Page - AVAGO TECHNOLOGIES LIMITED |
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AFCT-5179AZ Datasheet(HTML) 4 Page - AVAGO TECHNOLOGIES LIMITED |
4 / 8 page ![]() 4 Transmitter Section Design The transmitter section, Figure 3, uses a Multiple Quantum Well laser as its optical source. The package of this laser is designed to allow repeatable coupling into single mode fiber. In addition, this package has been designed to be compliant with IEC 825 Class 1 and CDRH Class I eye safety requirements. The optical output is controlled by a custom IC which detects the laser output via the monitor photo- diode. This IC provides both dc and ac current drive to the laser to ensure correct modulation, eye diagram and extinction ratio over temperature, supply voltage and life. PCB mounting The AFCT-5179xZ has two solderable mounting studs, Figures 5 and 6. These studs are not electrically connected. The transceiver is designed for common production processes. It may be wave soldered and aqueous washed providing the process plug is in place. Each process plug can only be used once during process- ing, although with subsequent use, it can be used as a dust cover. Figure 4. Recommended Circuit Schematic DATA DATA PECL INPUT LASER MODULATOR LASER LASER BIAS DRIVER LASER BIAS CONTROL PHOTODIODE (rear facet monitor) Figure 3. Simplified Transmitter Schematic NO INTERNAL CONNECTION NO INTERNAL CONNECTION TOP VIEW V EER 1 RD 2 SD 4 V CCR 5 V CCT 6 TD 8 V EET 9 NOTES: THE SPLIT-LOAD TERMINATIONS FOR ECL SIGNALS NEED TO BE LOCATED AT THE INPUT OF DEVICES RECEIVING THOSE ECL SIGNALS. RECOMMEND 4-LAYER PRINTED CIRCUIT BOARD WITH 50 Ω MICROSTRIP SIGNAL PATHS BE USED. R1 = R4 = R6 = R8 = R10 = 130 Ω R2 = R3 = R5 = R7 = R9 = 82 Ω C1 = C2 = 10 µF (see Figure 2) C3 = C4 = C7 = C8 = 100 nF C5 = C6 = 0.1 µF L1 = L2 = 3.3 µH COIL OR FERRITE INDUCTOR. TERMINATE AT THE DEVICE INPUTS VccFILTER AT VccPINS TRANSCEIVER V CC C8 C1 L1 L2 TD RD 3 TD 7 R8 RD RD V CC R5 R7 R6 C6 SD R10 C7 C2 C3 C4 R4 V CC R2 R3 R1 TERMINATION AT TRANSCEIVER INPUTS TD C5 R9 |
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