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| 型号： | DSRT-L030-011 |
| 厂商： | CONEXANT SYSTEMS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, XMA |
| 文件页数： | 69/86页 |
| 文件大小： | 667K |
| 代理商： | DSRT-L030-011 |
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RipTide PCI Audio/Comm Device Family Product Description
1167
ROCKWELL PROPRIETARY INFORMATION
71
5.
Separate analog power/ground from digital power/ground with inductors or ferrite beads. The side effect of this
separation is that the analog circuit cannot dump their high frequency noise to the chassis ground. The EMI characteristic
of boards can be improved by using adequate decoupling and by limiting the areas of analog power/ground.
6.
The de-coupler on the PCICLK guard-band should be 0.001 uF to handle the clock harmonics. Decouple this guard-band
directly to a VCC pin near the PCICLK pin at the PCI connector.
7.
Provide several different values for de-coupling capacitors. These should be spread evenly around the power pins of
devices on the board. A few caps can be placed in open areas of the board to stabilize the power and ground.
18.1.6
Crystal Circuit
1.
Provide a separate trace(s) for the ground connections of the crystal's bypass capacitors going back to the digital ground
pins of the RipTide device. These traces should be as short as possible, relatively thick, and have minimal sharp bends.
See Section 18.2.
2.
Avoid tying the ground connections of these capacitors to surrounding ground copper island(s). In these cases, the return
high-frequency currents do not necessarily choose the shortest path and instead, they ripple the surrounding ground
distribution with EMI.
3.
Lay the crystal flat against a ground plane that has a low impedance path to ground.
18.1.7
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.
Rockwell 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
TXAM_L1,
TXAP_L1
Route in close proximity.
TXAM_L2,
TXAP_L2
Route in close proximity.
TXAM_H,
TXAP_H
Route in close proximity.
RXA_L1
Very sensitive; minimize trace length and its exposure to other signals, especially digital. Use a
12-mil trace.
RXA_L2
Very sensitive; minimize trace length and its exposure to other signals, especially digital. Use a
12-mil trace.
RXA_H
Very sensitive; minimize trace length and its exposure to other signals, especially digital. Use a
12-mil trace.
MIC
Very sensitive; minimize trace length and its exposure to other signals, especially digital.
VC_M
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.
VREFP_M
Place decoupling capacitor network as close as possible. Use 12-mil or thicker traces.
3.
Provide a separate local analog ground plane for the analog signals listed above.
4.
Rotate the Rockwell devices 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. See Section 18.2.
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