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参数资料
| 型号： | ASDL-3212-021 |
| 厂商： | LITE-ON ELECTRONICS INC |
| 元件分类： | 其它接口 |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, DMA6 |
| 封装： | 7 X 2.73 MM, 1.64 MM HEIGHT, MINIATURE PACKAGE-6 |
| 文件页数： | 4/17页 |
| 文件大小： | 542K |
| 代理商： | ASDL-3212-021 |
2
Appendix B: PCB Layout Suggestion
The ASDL-3212 is a shieldless part and hence does not
contain a shield trace unlike the other transceivers.The
effects of EMI and power supply noise can potentially
reducethesensitivityofthereceiver,resultinginreduced
linkdistance.ThefollowingPCBlayoutguidelinesshould
be followed to obtain a good PSRR and EM immunity
resultingingoodelectricalperformance.Thingstonote:
1. The ground plane should be continuous under the
part.
2. VLED and Vcc can be connected to either unfiltered
or unregulated power supply. If VLED and Vcc share
the same power supply, CX3 need not be used. The
connections for CX1 and CX2 should be connected
beforethecurrentlimitingresistorR1.
3. CX2isgenerallyaceramiccapacitoroflowinductance
providing a wide frequency response while CX1 and
CX3 are tantalum capacitor of big volume and fast
frequency response.The use of a tantalum capacitor
ismorecriticalontheVLEDline,whichcarriesahigh
current.
4. Preferably a multi-layered board should be used
to provide sufficient ground plane. Use the layer
underneath and near the transceiver module as Vcc,
and sandwich that layer between ground connected
board layers. The diagrams below demonstrate an
exampleofa4-layerboard:
Top Layer
Bottom Layer
Theareaunderneaththemoduleatthesecondlayer,and
3cminalldirectionaroundthemoduleisdefinedasthe
criticalgroundplanezone.Thegroundplaneshouldbe
maximized in this zone.The layout below is based on a
2-layerPCB.
Top layer
Connect the module ground pin to
bottom ground layer
Layer 2
Critical ground plane zone. Do not connect
directly to the module ground pin
Layer 3
Keep data bus away from critical ground
plane zone
Bottom layer (GND)
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