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SY87729L Datasheet(PDF) 10 Page - Micrel Semiconductor

Part # SY87729L
Description  3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER
Download  14 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

SY87729L Datasheet(HTML) 10 Page - Micrel Semiconductor

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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
0.1
µF
Figure 4. Recommended Loop Filter Values


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