ICS1893 Datasheet, PDF (33/152 Pages) Integrated Circuit Systems – 3.3-V 10Base-T/100Base-TX Integrated PHYceiver™

ICS1893 - Release
Chapter 6 Interface Overviews
6.5.2 Twisted-Pair Receiver Interface
Figure 6-2 shows the design for the ICS1893 twisted-pair receiver interface.
• Two 56.2Ω 1% resistors are in series, with the center bypassed to ground with a 0.1-µF bypass
capacitor.
• No bypass capacitor is used with the receive transformer center tap.
• A 4.7-pF capacitor must be included across the ICS1893 side of the receive transformer.
Note:
1. Keep leads as short as possible.
2. Install the resistor network as close to the ICS1893 as possible.
Figure 6-2. ICS1893 Receiver Twisted Pair
System Ground Plane Chassis Ground Plane
TP_RXP 13
ICS1893
4.7 pF
TP_RXN 14
1:1
56.2Ω 1%
Center
Tap
56.2Ω 1%
0.1 µF
Separate Ground
Plane
To RJ-45
75Ω
0.1 µF 2 kV
ICS1893 Rev C 6/6/00
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
33
June, 2000