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AFE032: Do we have the RX noise data when RX_PGA1=32 and RX_PGA2=16

Wayne Wang20
Expert 4360 points
Part Number: AFE032

Hi team,

My customer is using AFE032. They noticed that in our datasheet, we provide below noise parameter. But the test condition of these 2 pictures are both RX_PGA1=32 and RX_PGA2=1. 

Now my customer wants to set the RX_PGA1=32 and RX_PGA2=16 to increase the gain. But they found the noise signal increased a lot after the gain increases. So they want to check if we have the noise data as below 2 pictures but the test condition is RX_PGA1=32 and RX_PGA2=16. Thanks.

Best regards,

Wayne

  • 0
    TI__Mastermind 48046 points

    Hi Wayne,

    Q: But they found the noise signal increased a lot after the gain increases. So they want to check if we have the noise data as below 2 pictures but the test condition is RX_PGA1=32 and RX_PGA2=16.

    The figures published in AFE032 is a typical Rx sensitivity. Can you be more specific about the noise figures? Please send me the schematic and/or screen shot if any, including the PLC application BW (I assumed that you are talking about G3-FCC protocol). 

    If it is inconvenient to present in public forum, please send the information via our internal email server. I am curious why the customer has to increase the Rx gain to the maximum settings of the part. Is there a way to minimize the IR, coupling, transmission line losses through power lines? How long is the communication distance etc.?

    Best,

    Raymond 

  • 0 in reply to Raymond Zhang1
    TI__Expert 4360 points

    Hi Raymond,

    I can go check with customer about why the have to increase the gain. But now customer just needs us provide the noise density data and uVrms data in the configuration of RX_PGA1=32 and RX_PGA2=16. Do we have such data? Thanks.

    Best regards,

    Wayne

  • 0 in reply to Wayne Wang20
    TI__Mastermind 48046 points

    Hi Wa512yne,

    I can request the information from our test lab. I do not know. AFE032 has plenty transmitting power and customer should not need to maximize the gain of the part. When Rx gain is increased, all the noise will be gained up as well. Basically you have 32*16 = 512 V/V, which is a huge gain for the application. 

    Please ask the customer why it has to increase the gain at the level. It does not make much sense. 

    Best,

    Raymond