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ST802RT1AFR Datasheet(PDF) 47 Page - STMicroelectronics |
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ST802RT1AFR Datasheet(HTML) 47 Page - STMicroelectronics |
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47 / 58 page  ST802RT1A, ST802RT1B Device operation Doc ID 17049 Rev 1 47/58 7.21 PECL receiver The data signals coming from the optical transceiver are in PECL format and need to be converted to CMOS level before being transmitted to the data and clock recovery, and to the digital portion. The data is sampled by the optical transceiver, but the data stream is related to the clock of the transmitting transceiver, so it needs to be recovered, re-sampled and aligned to the RX clock. This function and all the timing involved are assumed to be compatible with that currently available for the 100TX (twisted pair), so no modifications are required for this circuit. Figure 9. Implementation of the PECL TX section Figure 10. Implementation of the PECL RX section |
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