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AFE5816: A question about DTGC operation

John11513
Expert 5360 points
Part Number: AFE5816

Hi team,

I have a question about the operation of DTGC function of AFE5816: in "External Non-Uniform Mode", firstly the device is set TGC_UP_DN=0 to increase the gain up, then what will happen if TGC_UP_DN is set to '1' before the gain reach "Stop Gain"? If it will ignore TGC_UP_DN signal until the Stop Gain is reached? Or it will ignore Stop Gain configuration and go into down mode directly?

Thank you!

John

  • 0
    TI__Mastermind 49176 points
    Hi John,

    I just wanted to let you know that we are looking at your questions related to DTGC of AFE5816 and will follow-up in detail tomorrow.
  • 0
    TI__Mastermind 49176 points
    John,

    In "External Non-uniform mode", when a positive edge transition is received on the device TGC_SLOPE pin, the device gain increases or decreases by either a positive step or negative step based on the TGC_UP_DN pin voltage level.
    If the TGC_UP_DN pin is set to a level 0, the device gain increases and if the TGC_UP_DN pin is set to 1, the device gain decreases.

    In this mode, the gain is increased (TGC_UP_DN is set to '0') on every positive edge transition of the TGC_SLOPE pin until the Stop Gain is reached but if the TGC_UP_DN is set to '1', then the gain is decreased. The gain is decreased if the TGC_UP_DN is set to '1' even before the Stop Gain is reached.