lxt9763 Intel Corporation, lxt9763 Datasheet - Page 42

• Manufacturer Part Number: lxt9763
• Description: Fast Ethernet 10/100 Hex Transceiver With Full Mii
• Manufacturer: Intel Corporation

LXT9763 — Fast Ethernet 10/100 Hex Transceiver with Full MII
42
Figure 18. Typical Twisted-Pair Interface
A
1. The 100Ω transmit load termination resistor typically required is integrated in the LXT97xx.
2. Magnetics without a receive pair center-tap do not require a 2 kV termination.
3. Center tap current may be supplied from 3.3V VCCA as shown. However, additional power savings may be
4. Receive common mode bypass cap may improve BER performance in systems with noisy power supplies.
5. Recommended 0.1µF capacitor to improve the EMI performance.
realized by supplying the center-tap from from a 2.5V current source. In either case a single ferrite bead
(rated at 560 mA) may be used to supply center tap current to all ports.
LXT9763
TPFOP
TPFON
GNDA
VCCT
TPFIN
TPFIP
270 pF 5%
0.1µF
270 pF 5%
1
50Ω 1%
5
50Ω 1%
0.01 µF
4
.01µF
3
1:1
1:1
*
2
*
50 Ω
50 Ω
* = 0.001 µF / 2.0 kV
50 Ω
50 Ω
50 Ω
50 Ω
RJ45
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