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IWR6843AOP: different of RX_GAIN and RF_GAIN_TARGET

Part Number: IWR6843AOP

Hello,
what is the different of RX_GAIN and RF_GAIN_TARGET (document mmWave-Radar-Interface-Control pare 85, table 5.24 PF_RX_GAIN). What gain will be use when and what is the advantage?

2nd question: What is the SPI max sample rate. Customer can only reach 8MHz. After that the data transmission gets inconsistent.

Regards, Holger