Preliminary Data Sheet
July 2000
Application Section (continued)
LU5X34F
Quad Gigabit Ethernet Transceiver
HDOUTP
10 Ω†
68 Ω
ZO = 50 Ω 0.01 µF
TX(+)
50 Ω
191 Ω
TXA[9:0]
REFCLK
TRANSMIT
LU5X34F
50 Ω
HDOUTN
10 Ω†
OLREF OLRVS
*
0.1 µF
191 Ω
ZO = 50 Ω
0.01 µF
68 Ω
TRANSMIT
GBIC
TX(–)
5V
5-8811(F)b
* External resistor connected between OLREF and OLRVS. See Table 17 for resistor value vs. termination impedance and output swing.
† Damping resistor, maximum = 10 Ω.
Figure 10. Typical Termination for a Single-Channel, High-Speed Serial
Transmit Port Interfacing a 5 V GBIC Transceiver
Table 17. External Resistor Value vs. Differential Output Level Viewing
Resistor Value (Ω)
7.5 k/11.25 k
5 k/7.5 k
4 k/6 k
Termination Impedance (Ω)
50/75
Differential Output Voltage (V)
0.8
1.2
1.6
Lucent Technologies Inc.
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