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參數(shù)資料
| 型號： | RH56D-PCI |
| 廠商： | Conexant Systems, Inc. |
| 英文描述： | Host Controlled V.90/K56flex Modem device |
| 中文描述： | 主機(jī)控制V.90/K56flex調(diào)制解調(diào)器設(shè)備 |
| 文件頁數(shù)： | 42/60頁 |
| 文件大?。?/td> | 357K |
| 代理商： | RH56D-PCI |
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RH56D-PCI Modem Designer’s Guide
4-8
Conexant
1213
Conexant Proprietary Information
4.2.8 Modem Analog Interface
This is a critical portion of the layout. Failure to do this correctly will result in poor modem performance. The signals between
the transformer and the device are all analog signals.
1. Conexant devices that connect to the transformer have an analog area separate from the digital. Keep them separate.
2. Keep all digital signals away from the transformer and associated analog signals. Following is the list of critical analog
signals that should never get near digital signals.
Signal
Routing
TXA1
TXA2
RXA
Route in close proximity to TXA2.
Route in close proximity to TXA1.
Very sensitive; minimize trace length and its exposure to other signals, especially digital. Use a
12-mil trace.
Very sensitive; minimize trace length and its exposure to other signals, especially digital.
Very sensitive; place decoupling capacitor network as close as possible with the shortest path to
AGND pin. Only then, tie to a good local analog ground. Use 12-mil or thicker traces. Use ferrite
bead in AGND lead is necessary. Avoid loading by external circuits.
Place decoupling capacitor network as close as possible. Use 12-mil or thicker traces.
MIC_V
VC
VREF
TELIN
TELOUT
3. Provide a separate local analog ground plane for the analog signals listed above.
4. Rotate the modem device(s) so that the routing to the transformer is as short as possible. That way the traces can be
short and the opportunity for digital signals to compromise the analog signals is decreased.
5. Do not put vias on these signals.
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