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Configuration for External LNA

I'm using AD9364 in Fast Attack AGC with Split table mode. We are also using an external LNA of 22dB gain and 2 variable gain amplifiers each of 19dB gain and variable attenuation of 0.5 to 31.5dB in steps of 0.5dB. Without using these amplifiers, My AGC settings works fine. If I want to use these front end module, how to configure my External LNA setting in AD9364 init? 

Just entering the settling time for all these front end module itself is enough or do I also need to modify the split gain table?

I'm using Split table mode.

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  • Hi 

    I  designed customized RF tranceiver board with AD9364. I have a customize RF board with an external LNA   and output connected to the RF transceiver board.,  I  worked in fast AGC mode with out external LNA , its working fine . when i tried to give  GPIO_O output to my external LNA to control attenuation of external LNA .The AGC loop is working fine in power on condition , when i tried to change the input of system, the AGC is going to failed .  

     I changed  the default gain table as per UG -570  and enabled the bit of D6  in the register of 0x026. please can any one suggest me how to fix my problem ? 

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