Microchip LAN7850 Bedienungsanleitung


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Seite 1/7
REV
CHANGE DESCRIPTION
NAME
DATE
A
Release
8-1-16
B
Increased +1.2V Capacitor Value & VDD12A Cap Requirement
1-16-17
Any assistance, services, comments, information, or suggestions provided by Microchip (including without limitation any comments to the
eect that the Company’s product designs do not require any changes) (collectively, “Microchip Feedback”) are provided solely for the
purpose of assisting the Company in the Company’s attempt to optimize compatibility of the Company’s product designs with certain
Microchip products. Microchip does not promise that such compatibility optimization will actually be achieved. Circuit diagrams utilizing
Microchip products are included as a means of illustrating typical applications; consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility
is assumed for inaccuracies. Microchip reserves the right to make changes to specifications and product descriptions at any time without
notice.
DOCUMENT DESCRIPTION
Component Placement Checklist for the LAN7850, 56-pin SQFN Package
Microchip
80 Arkay Drive, Suite 100
Hauppauge, New York 11788
Document Number Revision
CC524380 B
LAN7850 Component Placement Checklist
Page 2 of 7
Revision B
Component Placement Checklist for LAN7850
Information Particular for the 56-pin SQFN Package
LAN7850 SQFN Phy Interface:
1. There are no component placement issues associated with the Phy Interface of the
LAN7850 SQFN.
LAN7850 SQFN Magnetics:
1. Place the 0.10 F TX/RX Channel Center Tap termination capacitors as close to the
magnetics as possible.
2. Place the 75  cable side center tap termination resistors and the 1000 ïČF, 2KV
capacitor (Cmagterm) cap as close to the magnetics as possible.
RJ45 Connector:
1. Place the RJ45 connector, the magnetics and the LAN7850 SQFN as close together as
possible.
2. If No. 1 is not possible, keep the RJ45 connector and the magnetics as close as possible.
This will allow remote placement of the LAN7850 SQFN.
3. Select and place the magnetics as to set up the best routing scheme from the LAN7850
SQFN to the magnetics to the RJ45 connector. There are many styles and sizes of
magnetics with dierent pin outs to facilitate this operation. Investigate Tab-Up & Tab-
Down RJ45 connectors in order to facilitate layout.
4. Make sure to not place any other components in or near the TX Channel & RX Channel
lanes of the PCB. These lanes should be clear of any other signals and components.
LAN7850 Component Placement Checklist
Page 3 of 7
Revision B
Figure No.1 Indicating Component Placement


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: LAN7850

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