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FW803 Arkusz danych(PDF) 11 Page - Agere Systems

Numer części FW803
Szczegółowy opis  PHY IEEE 1394A Three-Cable Transceiver/Arbiter Device
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Agere Systems Inc.
11
Data Sheet, Rev. 3
June 2001
Three-Cable Transceiver/Arbiter Device
FW803 PHY IEEE 1394A
Application Information (continued)
5-6930 (F)
Figure 4. Typical Port Termination Network
Crystal Selection Considerations
The FW803 is designed to use an external 24.576 MHz crystal connected between the XI and XO terminals to pro-
vide the reference for an internal oscillator circuit. IEEE 1394a-2000 standard requires that FW803 have less than
±100 ppm total variation from the nominal data rate, which is directly influenced by the crystal. To achieve this, it is
recommended that an oscillator with a nominal 50 ppm or less frequency tolerance be used.
The total frequency variation must be kept below
±100 ppm from nominal with some allowance for error introduced
by board and device variations. Trade offs between frequency tolerance and stability may be made as long as the
total frequency variation is less than
±100 ppm.
Load Capacitance
The frequency of oscillation is dependent upon the load capacitance specified for the crystal, in parallel resonant
mode crystal circuits. Total load capacitance (CL) is a function of not only the discrete load capacitors, but also
capacitances from the FW803 board traces and capacitances of the other FW803 connected components.
TPBIAS1
TPA1+
TPA1–
TPB1+
TPB1–
TPBIAS0
TPA0+
TPA0–
TPB0+
TPB0–
42
41
40
39
38
37
36
35
34
33
TPBIAS1
56
56
56
56
5 k
220 pF
0.33
µF
IEEE 1394-1995 STANDARD
CONNECTOR
USE SAME PORT TERMINATION NETWORK AS ILLUSTRATED BELOW.
1
3
5
2
4
6
VG
VP
CABLE
POWER


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