Component Placement Checklist for LAN8740 : Information Particular for the 32-pin QFN Package
■If the Auto MDIX functionality is enabled, place the 49.9 Ω TX termination pull-up (TXP, pin 29) as close to the LAN8740 as possible. If the Auto MDIX feature is disabled in the application, place this pull-up termination as close as possible to the magnetics.
■f the Auto MDIX functionality is enabled, place the 49.9 Ω TX termination pull-up (TXN, pin 28) as close to the LAN8740 as possible. If the Auto MDIX feature is disabled in the application, place this pull-up termination as close as possible to the magnetics.
■Place the 49.9 Ω RX termination pull-up (RXP, pin 31) as close to the LAN8740 as possible.
■Place the 49.9 Ω RX termination pull-up (RXN, pin 30) as close to the LAN8740 as possible.
■ee Figure No. 1 for the placement of the termination resistors for the differential pairs for the LAN8740 Phy. These resistors are R1, R2, R3 & R4 in Figure No. 1.
■Place the four optional, low-valued, common mode capacitors for each differential signal as close as possible to the magnetics. They should be placed as to create the smallest possible stub. These caps are C1, C2, C3 & C4 in Figure No. 1.
■All the components discussed in this section should be considered critical components. To ensure the best signal integrity and good EMI performance, these critical components should be placed on the component side of the PCB. This will ensure that these components will be referenced to a contiguous ground plane reference on Layer 2 of the design.
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Datasheet |
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Please see the document for details |
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QFN |
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English Chinese Chinese and English Japanese |
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7-12-12 |
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Rev A |
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CC524363 |
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116 KB |
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