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[ADC12DC080] High Input Frequency Transformer Drive Circuit

Kuramochi Tadahiko
Guru 28715 points

Hi,

I have a question for High Input Frequency Transformer Drive Circuit ( Figure20 in datasheet ).

Why is this circuit connected with 2 transformers (ETC1-1-13) ? 

If it is one transformer,what problem do you happen? 

Thanks and Regards,

Kuramochi

  • 0
    TI__Expert 4340 points

    Hi Kuramochi,

    A differential signal is recommended to drive the ADC input to maximize the dynamic performance. The balance of the differential signal is critical and influences the distortion performance, particularly the H2 distortion. At low frequencies, the ADT1-1WT+ gives very good single-ended to differential conversion with good balance, so 1 transformer is enough. At higher frequencies, the ADT1-1WT balance gets worse, so we replace the network with a cascade of 2x ETC1-1-13 (now called MABA007159) transformers. This network provides a wide bandwidth, and good balance at high frequencies. Only Using 1x MABA007159 does not have good enough balance.

    Regards, Josh

  • 0 in reply to Joshua Carnes
    Guru 28715 points

    Hi Joshua-san,

    Thank you for your reply.

    Maybe, I understood.

    Is following connection of transformers correct ?

    Thanks and Regards,

    Kuramochi