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參數(shù)資料
| 型號： | MT933 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 38K |
| 代理商： | MT933 |
MSAN-182
Application Note
2
Both pairs of signals should be kept as short and
straight as possible. The RX lines are especially
sensitive to extraneous noise, and should be routed
using the shortest path. If a trade-off is necessary
between RX and TX when placing components, the
RX path should receive the cleanest path.
The TX and RX lines must be routed as pairs with as
little difference between the two lines in each pair.
You should have even spacing between each of the 2
signals at all times. Avoid sharp bends in the tracks.
Avoid going through vias if possible. Do not route the
TX and RX signal pairs near each other or near any
other signals.
Maintain a.050 inch minimum spacing from any TX
or RX line.
You should also avoid routing other signals such as
LED indicator signals near the RX or TX pairs.
Both the TX and RX pairs should never cross a
voided plane on an adjacent PCB layer.
The
characteristic impedance of 100 Ohms to provide
effective coupling to the UTP Cable, then be properly
terminated to eliminate reflections from the incoming
signal. The differential characteristic impedance of
RX
traces
should
have
a
differential
Figure 1 - Example Layout for MT933
1
17
33
.01
μ
f
.01
μ
f
.1
μ
f
.001
μ
f
.01
μ
f
.01
μ
f
49
.01
μ
f
.01
μ
f
.01
μ
f
.01
μ
f
.01
μ
f
.01
μ
f
.01
μ
f
.1
μ
f
.001
μ
f
FB
.01
μ
f
.01
μ
f
FB
.01
μ
f
Layout Key
Vcc via
GND via
Ferrita Bd.
Capacitor
Digital Power Plane
RXV
DD
Power Plane
TXV
DD
Power Plane
Notes:
1. Caps should be NPD/COG type
void
void
void
FB
10
μ
f
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