nRF24L01+ Product Specification

11 Application example

nRF24L01+ with single ended matching network crystal, bias resistor, and decoupling capacitors.

Figure 32. nRF24L01+ schematic for RF layouts with single ended 50Ω RF output

nRF24L01+ Product Specification

a.C1 and C2 must have values that match the crystals load capacitance, CL.

b.The nRF24L01+ and nRF24L01 application example and BOM are the same with the exception of R1. R1 can be mounted for backward compatibility with nRF24L01. The use of a 1Mohm resistor externally does not have any impact on crystal performance.

Table 29. Recommended components (BOM) in nRF24L01+ with antenna matching network

11.1PCB layout examples

Figure 33., Figure 34. and Figure 35. show a PCB layout example for the application schematic in Figure 32..

A double-sided FR-4 board of 1.6mm thickness is used. This PCB has a ground plane on the bottom layer. Additionally, there are ground areas on the component side of the board to ensure sufficient grounding of critical components. A large number of via holes connect the top layer ground areas to the bottom layer ground plane.

nRF24L01+ Product Specification

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Figure 33. Top overlay (nRF24L01+ RF layout with single ended connection to PCB antenna and 0402 size passive components)

Figure 34. Top layer (nRF24L01+ RF layout with single ended connection to PCB antenna and 0402 size passive components)

nRF24L01+ Product Specification

Figure 35. Bottom layer (nRF24L01+ RF layout with single ended connection to PCB antenna and 0402 size passive components

The nest figure (Figure 36., Figure 37. and Figure 38.) is for the SMA output to have a board for direct measurements at a 50Ω SMA connector.

Figure 36. Top Overlay (Module with OFM crystal and SMA connector)

nRF24L01+ Product Specification

Figure 37. Top Layer (Module with OFM crystal and SMA connector)

Figure 38. Bottom Layer (Module with OFM crystal and SMA connector)