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| 型號： | 84221 |
| 英文描述： | 84221 Quad 10/100 Mbps TX/FX/10BT (PHY) manual 1/99 |
| 中文描述： | 84221四10/100 Mbps的TX/FX/10BT（PHY）的手冊1 / 99 |
| 文件頁數(shù)： | 44/70頁 |
| 文件大?。?/td> | 1017K |
| 代理商： | 84221 |
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44
MD400184/A
84221
4.0 APPLICATION INFORMATION
4.1 EXAMPLE SCHEMATICS
A typical example of the 84221 used for a switching hub
application in twisted pair mode is shown in Figure 12; an
example of the 84221 used in fiber mode is shown in
Figure 13.
4.2 TP INTERFACE
4.2.1 Transmit Interface
The interface between the TP outputs on TPOP/N and
the twisted pair cable is typically transformer coupled and
terminated with the two resistors as shown in Figure 12.
The transformer for the transmitter is recommended to
have a winding ratio of 1:1 with the center tap of the
primary winding tied to VDD, as shown in Figure 12. The
specifications for such a transformer are shown in Table
20. Sources for quad transformers compatible with the
84221 are listed in Table 21. Note that both “Stacked” and
“Non-Stacked pin out types are listed. The Stacked and
Non-Stacked designation refers to the type of RJ-45
connector used on the secondary side (line side) of the
transformer. The pinout of these types differ slightly so
that traces to the magnetics may be kept as short and
direct as possible.
The "non-stacked" RJ-45 (also referred to as harmonica)
is a traditional horizontally oriented connector consisting
of four RJ-45 jacks in a single in-line assembly.
The newer "stacked" connector consists of a two-over-two
configuration so that four RJ-45 jacks are located in the
footprint area of two side by side connectors. This is a
significant improvement for higher density multi-port
applications and smaller system form-factors.
The SEEQ 84221 pin-out has been optimized for
connection to transformers and connectors designed for
the higher density stacked configuration. The SEEQ
Quad Transceiver will also operate with non-stacked
connectors using either transformers that map the pin-out
to the non-stacked configuration, or by using trace
"crossovers" on the pc board layout.
The transformers listed with "non-stacked" pin-outs use
crossover connections inside the part to map the stacked
pin-out of the 84221 to non-stacked RJ-45 connectors.
Crossovers internal to the transformer are not made in a
controlled impedance environment, so this can impact,
somewhat, the cross-talk performance of the system.
For best cross-talk and system performance, it is
suggested that stacked connector and transformer
configurations be used. Alternately, non-stacked
connectors may be used with stacked transformer types
and the crossover wiring can be put on the pc board using
a ground plane to reduce impedance mismatch.
The transmit output needs to be terminated with two
external termination resistors in order to meet the output
impedance and return loss requirements of IEEE 802.3.
It is recommended that these two external resistors be
connected from VDD to each of the TPOP/N outputs, and
their value should be chosen to provide the correct
termination impedance when looking back through the
transformer from the twisted pair cable, as shown in
Figure 12. The value of these two external termination
resistors depends on the type of cable driven by the
device. Refer to the Cable Selection Section for more
details on choosing the value of these resistors.
To minimize common mode output noise and to aid in
meeting radiated emissions requirements, it may be
necessary to add a common mode choke on the transmit
outputs as well as add common mode bundle termination.
The transformers listed in Table 21 all contain common
mode chokes on both the transmit and receive sides, as
shown in Figure 12. Common mode bundle termination is
achieved by tying the unused pairs in the RJ45 to chassis
ground through 75 ohm resistors and a 0.01 uF capacitor,
as shown in Figure 12.
To minimize noise pickup into the transmit path in a
system or on a PCB, the loading on TPOP/N should be
minimized and both outputs should always be loaded
equally.
Table 20. TP Transformer Specification
Parameter
Specification
Transmit
Receive
Turns Ratio
Inductance, (uH Min)
Leakage Inductance, (uH)
Capacitance (pF Max)
DC Resistance (Ohms Max)
1:1 CT
350
0.2
15
0.4
1:1
350
0.2
15
0.4
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| 842225 REV A1 | 制造商:Aavid Thermalloy 功能描述:- Bulk |
| 84222C | 功能描述:固定電感器 2.2uH 2.0A Mini SMT Power RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| 8422303301B | 制造商:ESSEX 功能描述:SPDT 277V. COIL ENCLOSED RELAY |
| 84223C | 功能描述:固定電感器 22uH 0.6A Mini SMT Power RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| 84224C | 功能描述:固定電感器 220uH 0.2A Mini SMT Power RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
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