FW802A-DB Просмотр технического описания (PDF) - Agere -> LSI Corporation

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FW802A-DB

Low-Power PHY IEEE* 1394A-2000 Two-Cable Transceiver/Arbiter Device

Agere -> LSI Corporation 

Data Sheet, Rev. 3

June 2001

FW802A Low-Power PHY IEEE 1394A-2000

Two-Cable Transceiver/Arbiter Device

Application Information (continued)

42

TPBIAS1

41

TPA1+

40

TPA1–

39

TPB1+

38

TPB1–

37

TPBIAS0

56 Ω

36

TPA0+

35

TPA0–

34

TPB0+

33

TPB0–

56 Ω

220 pF

TPBIAS1

USE SAME PORT TERMINATION NETWORK AS ILLUSTRATED BELOW.

0.33 µF

56 Ω

5

6

56 Ω

5 kΩ

3

4

1

2

IEEE 1394-1995 STANDARD

CONNECTOR

VP

VG

CABLE

POWER

Figure 4. Typical Port Termination Network

5-6930 (F)

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.

Agere Systems Inc.

11

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