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HSDL3208 Datasheet(PDF) 12 Page - Agilent(Hewlett-Packard) |
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HSDL3208 Datasheet(HTML) 12 Page - Agilent(Hewlett-Packard) |
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12 / 18 page  12 Top View Figure 18. PCB layout suggestion. Appendix B: PCB Layout Suggestion The HSDL-3208 is a shieldless part and hence does not contain a shield trace, unlike the other transceivers. The following PCB layout guide- lines should be followed to obtain a good PSRR and EM immunity, resulting in good electrical performance. Things to note: 1. The AGND pin should be connected to the ground plane. 2. C1 and C2 are optional supply filter capacitors; they may be left out if a clean power supply is used. 3. VLED can be connected to either unfiltered or unregulated power supply. If VLED and VCC share the same power supply and C1 is used, the connection should be before the current limiting resistor R2. In a noisy environ- ment, including capacitor C2 can enhance supply rejection. C1 is generally a ceramic capacitor of low inductance providing a wide frequency response while C2 is a tantalum capacitor of big volume and fast frequency response. The use of a tantalum capacitor is more critical on the VLED line, which carries a high 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. Refer to the diagram below for an example of a 4-layer board. The area underneath the module at the second layer, and 3 cm in all directions around the module, is defined as the critical ground plane zone. The ground plane should be maximized in this zone. Refer to application note AN1114 or the Agilent IrDA Data Link Design Guide for details. The layout below is based on a 2-layer PCB. Bottom View TOP LAYER CONNECT THE METAL SHIELD AND 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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Similar Description - HSDL3208 |
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