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ATSAMB11-MR210CA Datasheet(PDF) 19 Page - ATMEL Corporation |
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ATSAMB11-MR210CA Datasheet(HTML) 19 Page - ATMEL Corporation |
19 / 26 page ATSAMB11-MR210CA/MR510CA [DATASHEET] Atmel-42498D-SAMB11-MR210CA-MR510CA_Datasheet_09/2016 1 9 19 Figure 8-2. No PCB/GND Cut Out Area Atmel No PCB area cut out 6.5 mm 22 mm SAMB11 Module 8.1 Power and Ground Dedicate one layer as a ground plane. Make sure that this ground plane does not get broken up by routes. Power can route on all layers except the ground layer. Power supply routes should be heavy copper fill planes to ensure the lowest possible inductance. The power pins of the module should have a via directly to the power plane as close to the pin as possible. Decoupling capacitors should have a via right next to the capacitor pin and this via should go directly down to the power plane – that is to say, the capacitor should not route to the power plane through a long trace. The ground side of the decoupling capacitor should have a via right next to the pad which goes directly down to the ground plane. Each decoupling capacitor should have its own via directly to the ground plane and directly to the power plane right next to the pad. The decoupling capacitors should be placed as close to the pin that it is filtering as possible. 8.2 Interferers One of the biggest problems with RF receivers is poor performance due to interferers on the board radiating noise into the antenna or coupling into the RF traces going to input LNA. Care must be taken to make sure that there is no noisy circuitry placed anywhere near the antenna or the RF traces. All noise generating circuits should also be shielded so they do not radiate noise that is picked up by the antenna. Also, make sure that no traces route underneath the RF portion of the SAMB11-MR210CA. Also, make sure that no traces route underneath any of the RF traces from the antenna to the SAMB11-MR210CA input. This applies to all layers. Even if there is a ground plane on a layer between the RF route and another signal, the ground return current will flow on the ground plane and be coupled into the RF traces. |
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