DP83865-EB National Semiconductor, DP83865-EB Datasheet - Page 70

• Manufacturer Part Number: DP83865-EB
• Description: BOARD EVALUATION DP83865
• Manufacturer: National Semiconductor

Specifications of DP83865-EB

• Main Purpose: Interface, Ethernet
• Utilized Ic / Part: DP83865
• Lead Free Status / RoHS Status: Not applicable / Not applicable

www.national.com
5.0 Design Guide
5.13.2 Magnetics
It is important to select the compoment that meets the
requirements. Per IEEE 802.3ab Clause 40.8, the compo-
nent requirements are listed in Table 57.
transformer winding should have the configuration shown
in Figure 21. The recommended magnetics has an isola-
tion transformer followed by a common mode choke to
reduce EMI. There is an additional auto-transformer which
is center tapped. To save board space and reduce compo-
nent count, RJ-45 with integrated magnetics may be used.
The following are magnetics meeting the requirements
(Table 57).
Note: Contact Magnetics manufactures for latest part numbers and product specifications. All Magnetics should be thor-
oughly tested and validated before using them in production.
Differential to Common
www.haloelectronics.com
www.haloelectronics.com
Pulse Engineering, Inc.
Primary Inductance
Rejection Ration
www.pulseeng.com
www.belfuse.com
Insertion Loss
Return Loss
Manufacturer
Parameter
Turn Ratio
Bel Fuse, Inc.
Rise Time
www.delta.tw
Crosstalk
Isolation
Midcom
Delta
Halo
(Continued)
10/100/1000 Mbps2X1 Integrated Magnetics
1,500
-14.4
-13.1
Min
350
-18
-12
-10
-43
-37
-33
-45
-40
-35
10/100/1000 Mbps Isolation Transformer
10/100/1000 Mbps Isolation Transformer
10/100/1000 Mbps Isolation Transformer
10/100/1000 Mbps Isolation Transformer
10/100/1000 Mbps Isolation Transformer
10/100/1000 Mbps Isolation Transformer
10/100/1000 Mbps Isolation Transformer
-
-
-
-
-
-
Table 58. Recommended Magnetics
Table 57. Magnetics Requirements
In addition, the
Typ
1:1
1.6
Description
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Max
-1.1
-0.5
-1.0
-1.2
1.8
-
-
-
-
-
-
-
-
-
-
-
-
-
-
70
TCT
TD+
TD-
Figure 21. Transformer configuration (1 ch)
Units
Vrms
uH
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
ns
-
TG1G-S002NZ
S558-5999-P3
S558-5999-T3
0843-2B1T-33
000-7093-37R
Part Number
100 - 125 MHz
LF9203
60 - 100 MHz
80 - 100 MHz
60 - 100 MHz
60 - 100 MHz
H5007
H5008
30 - 40 MHz
40 - 50 MHz
50 - 80 MHz
30 - 60 MHz
30 - 60 MHz
0.1 - 1 MHz
1 - 60 MHz
1 - 30 MHz
1 - 30 MHz
1 - 30 MHz
Condition
10 - 90 %
HPOT
1%
-
MCT
MX+
MX-