lxt971a Intel Corporation, lxt971a Datasheet - Page 50

• Manufacturer Part Number: lxt971a
• Description: 3.3v Dual-speed Fast Ethernet Phy Transceiver
• Manufacturer: Intel Corporation

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
50
Figure 23. Typical Twisted-Pair Interface - NIC
1. Center-tap current may be supplied from 3.3 V VCCA as shown. Additional power savings may
2. The 100 : transmit load termination resistor typically required is integrated in the LXT971A.
3. Magnetics without a receive pair center-tap do not require a 2 kV termination.
4. RJ-45 connections shown for standard NIC. TX/RX crossover may be required for repeater and
be realized by supplying the center-tap from a 2.5 V current source. A separate ferrite bead
(rated at 50 mA) should be used to supply center-tap current.
switch applications.
LXT971A
TPFON
TPFOP
TPFIP
VCCA
SD/TP
TPFIN
GND
0.1PF
270 pF 5%
270 pF 5%
0.1PF
2
50:
50:
0.01 PF
.01PF
1
1:1
1:1
3
*
*
50 :
50 :
* = 0.001 PF / 2.0 kV
Rev. Date: August 7, 2002
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50 :
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Document #: 249414
Revision #: 002
Datasheet
RJ-45
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8
7
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4
3
2
1