FW801BF Просмотр технического описания (PDF) - Agere -> LSI Corporation

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FW801BF

Low-Power PHY 1394a-2000 One-Cable Transceiver/Arbiter Device

Agere -> LSI Corporation 

Data Sheet

January 2005

Application Information (continued)

B7

VSSA

F7

VSSA

C7

VDDA

G7

VDDA

D7

TPBIAS[0]

56 Ω

F8

TPA[0]

G8

TPAN[0]

H7

TPB[0]

H8

TPBN[0]

56 Ω

220 pF

0.33 µF

56 Ω

5

3

56 Ω

5 kΩ

1

FW801BF PHY 1394a-2000

One-Cable Transceiver/Arbiter Device

6

IEEE 1394-1995 STANDARD

4

CONNECTOR

2

VP

VG

CABLE

POWER

Figure 4. Typical Port Termination Network

5-7654 (F)

Crystal Selection Considerations

The FW801BF is designed to use an external 24.576 MHz parallel resonant fundamental mode crystal connected

between the XI and XO terminals to provide the reference for an internal oscillator circuit. The IEEE 1394a-2000

standard requires that FW801BF 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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