LAUNCHXL-CC1350: Schematic questions

Gregory Duperon

Part Number: LAUNCHXL-CC1350

1. Is the section circled in blue just for biasing the RF lines and not for any type of matching?

2. Why is there a cross over after the portion circled in red? If I am not using the switch, is this cross over still necessary? (Iwill just be using the 433 MHz path, not the 2.4 GHz).

over 5 years ago

0 YiKai Chen over 5 years ago

Guru 735695 points

1. It's used for matching and switching between RX_TX/RF_P and RX_N.

2. It needs the cross is to connect RF_N to PORT1+.

0 TER over 5 years ago in reply to YiKai Chen

TI__Guru**** 317180 points

1) This is external bias for the LNA. If only internal bias setting is used these can be removed. See fig 1 in http://www.ti.com/lit/an/swra640c/swra640c.pdf

2) Layout. The lines are crossed on the schematic to ensure that the lines do not have to be crossed on the layout. This is due to how the pinout of the two devices are.

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LAUNCHXL-CC1350: Schematic questions