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參數(shù)資料
| 型號： | DM9338 |
| 文件頁數(shù)： | 31/43頁 |
| 文件大?。?/td> | 509K |
| 代理商： | DM9338 |
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DM9331
100 Mbps Twisted Pair/Fiber Ethernet Media Converter Chip
Preliminary 31
Version: DM9331-DS-P02
September 21, 2001
Application Notes
Network Interface Signal Routing
Place the transformer as close as possible to the RJ-45
connector. Place all the 50
Ω
resistors as close as possible
to the DM9331 RX
±
and TX
±
pins. Traces routed from
RX
±
and TX
±
to the transformer should run in close pairs
directly to the transformer. The designer should be careful
not to place the transmit pair across the receive pair. As
always, vias should be avoided as much as possible. The
network interface should be void of any signals other than
the TX
±
and RX
±
pairs between the RJ-45 to the
transformer and the transformer to the DM9331. There
should be no power or ground planes in the area under the
network side of the transformer to include the area under the
RJ-45 connector. (Refer to Figure 5 and 6.) Keep chassis
ground away from all active signals. The RJ-45 connector
and any unused pin should be tied to chassis ground
through a resistor divider network and a 2KV bypass
capacitor.
The Band Gap resistor should be placed as physically close
to pins 47 and 48 as possible. (Refer to Figure 1, 2, 3-1, and
3-2). The designer should not run any high-speed signal
near the Band Gap resistor placement.
1. 100Base-TX Side Application
DM9331
RX+
RX-
TX+
TX-
BGRESG
BGRES
Transformer
RJ45
1
2
8
3
4
5
6
7
1:1
1:1
75
1%
75
1%
75
1%
75
1%
3.3V AVCC
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF/2KV or 0.01μF/2KV
Chasis GND
6.8K
, 1%
50
1%
50
1%
50
1%
50
1%
3.3V AVCC
AGND
AGND
AGND
AGND
3
4
7
8
47
48
Figure 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM9334 | 8-Bit Addressable Latch |
| DM9334N | 8-Bit Addressable Latch |
| DM9348 | |
| DM93L00 | |
| DM93L01 | |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM9338 WAF | 制造商:Texas Instruments 功能描述: |
| DM9338J/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Register File |
| DM9338N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit Multiple Port Register |
| DM9338W/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| DM933N | 制造商:Texas Instruments 功能描述: |
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