LXT9763 — Fast Ethernet 10/100 Hex Transceiver with Full MII
Figure 18. Typical Twisted-Pair Interface
A
TPFOP
RJ45
1:1
1
2
3
4
5
6
7
8
1
TPFON
50
Ω
50
50
Ω
Ω
270 pF 5%
TPFIP
1:1
50Ω 1%
LXT9763
2
50
50
Ω
Ω
50Ω 1%
50
Ω
TPFIN
270 pF 5%
3
* = 0.001 µF / 2.0 kV
0.01
µF
*
*
4
VCCT
GNDA
.01µF
0.1µF
5
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
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.
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.
42
Datasheet
INTEL [ INTEL ]
