Encountered ADRF6850 design problems to seek help

I use the ADRF6850 as quadrature demodulator,

I hope to use this the device VGAIN pin for AGC

The demodulated output of the baseband signal bandwidth is 30MHz,

I do not know which devices of the detector circuit to accomplish this function.

Please tell me this device and the ADRF6850 how to connect?

I hope to be able to get quick help.

Thank you very much.

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