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Original question:

CC2500: CC2500: WOR

CC2500: Some question about CC2500

Lumina Gui
Expert 2635 points
Part Number: CC2500
Other Parts Discussed in Thread: CC2510

Hi Sir,

Our new project using CC2500 instead of CC2510 for the wireless design. The PCBA board adopts a two-layer design, and RF_N and RF_P  pin come out as differential ports, followed by L1, L2, C13, C14 differential to single-ended balanced circuits. While the impedance matching in this part of the specification requires 80+j74, but our two-layer board cannot do the impedance matching. So we have a few questions about this.

1) Is it necessary to make a four-layer board to meet the requirements of 80+j74? Impedance matching can only be done by controlling the real part to the target of 80 ohms? Will it affect the actual performance?

2) Can this part of the balanced circuit be tested normally when the impedance matching of the two-layer board is not done? If so, is it tested with a network analyzer? Or it must be adjusted to 80+J74 to be considered OK?

The schematic is as follows:

Thanks,

Best Regards

  • 0
    TI__Genius 15590 points

    Hi Lumina,

    You should be able to achieve the impedance match with 2 layers, it's just a matter of tweaking either the layer thickness, transmission line trace width, etc. However, there are also some benefits to moving to a 4-layer design. I recommend checking out SWRA236 and SWRA367 for more in-depth information on designing with the CC2500 and 2-layer vs 4-layer designs 

    Thanks,

    Alexis