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FW802A-DB Datasheet(PDF) 11 Page - Agere Systems |
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FW802A-DB Datasheet(HTML) 11 Page - Agere Systems |
11 / 24 page Data Sheet, Rev. 3 FW802A Low-Power PHY IEEE 1394A-2000 June 2001 Two-Cable Transceiver/Arbiter Device Agere Systems Inc. 11 Application Information (continued) 5-6930 (F) Figure 4. Typical Port Termination Network 1394 Application Support Contact Information E-mail: 1394support@agere.com Crystal Selection Considerations The FW802A is designed to use an external 24.576 MHz crystal connected between the XI and XO terminals to provide the reference for an internal oscillator circuit. IEEE 1394a-2000 standard requires that FW802A 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. TPBIAS1 TPA1+ TPA1– TPB1+ TPB1– TPBIAS0 TPA0+ TPA0– TPB0+ TPB0– 42 41 40 39 38 37 36 35 34 33 TPBIAS1 56 Ω 56 Ω 56 Ω 56 Ω 5 k Ω 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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