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SY87729L Datasheet(PDF) 10 Page - Micrel Semiconductor |
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SY87729L Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 14 page AnyClock® SY87729L 10 Micrel, Inc. M9999-062807 hbwhelp@micrel.com or (408) 955-1690 Standard Protocol Applications From a single 27.000MHz reference input, the SY87729L can generate exactly correct frequencies for at least the 18 protocols listed in Table 7. This table also shows how to Protocol SY87729L Fout (MHz) Programming Bits ETR 32 0000 10011 01000 0111 000 10010 101 101 OC-1 51.84 0000 00001 11000 0111 000 01100 101 101 Fast Ethernet 50 0000 00010 11001 1000 000 01101 101 101 FDDI 125 0000 00100 10111 0111 000 00101 101 101 1/8 Fibre Channel 13.28125 0000 01011 00111 0111 000 11100 101 101 General 150 0000 00010 00111 0110 000 00100 101 101 OC-3/STM-1 155.52 0000 00001 11000 0111 000 00100 101 101 ESCON 50 0000 00010 11001 1000 000 01101 101 101 1/4 Fibre Channel 26.5625 0000 01011 00111 0111 000 10100 101 101 1/2 Fibre Channel 53.125 0000 01011 00111 0111 000 01100 101 101 OC-12/STM-4 155.52 0000 00001 11000 0111 000 00100 101 101 Fibre Channel 106.25 0000 01011 00111 0111 000 00110 101 101 Gigabit Ethernet 156.25 0000 00100 10111 0111 000 00100 101 101 D1 Video 69 0000 00001 00000 0110 000 01001 101 101 HDTV 92.8125 0000 00001 01111 1000 000 00111 101 101 Infiniband 125 0000 00100 10111 0111 000 00100 101 101 2x Fibre Channel 212.5 0000 01011 00111 0111 000 00011 101 101 OC-48/STM-16 155.52 0000 00001 11000 0111 000 00100 101 101 Table 7. Protocol Listings program the SY87729L for each protocol listed. This table assumes no digital wrapper. If your system includes such a wrapper, then modify the NdivSel and MdivSel bits accordingly. Loop Filter Values Each PLL in the SY87729L adjusts its loop gain through an external loop filter. Figure 4 shows Micrel’s recommended values for these. FNCVF+ or WRVCF+ FNCVF— or WRVCF— 2k Ω 0.1 µF Figure 4. Recommended Loop Filter Values |
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