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Original question:

THS3215: Scattering Parameters

THS3215: THS3215 DAC output

Links
Intellectual 2145 points
Part Number: THS3215

Hi Team

For DAC output "buffer + differential to single ended" scheme, please help confirm whether THS3215 HD2 (40MHz 1vpp) supports < - 75dbc, or there are other schemes。

Thanks in advance

Best regards,

William

  • 0
    TI__Expert 3620 points

    Hi William,

    The data we have available for differential to single ended HD2 over frequency is at specified at 2Vpp:

    It looks like 1Vpp at 40MHz probably puts you around -70dBc. Could you clarify what you mean by other schemes?

    Best,
    Sam

  • 0 in reply to Sam Burnett
    TI__Intellectual 2145 points

    Hi Sam

    Thanks for your kindly reply,

    Is there a way to improve HD2 performance to -75dBc

    Thank you a lot.

    Best Regards,

    William

  • +1 in reply to Links
    Guru 47485 points

    I believe the plot Sam put in was for the combined D2S +OPS into 100ohm load. That plot shows about -69dBc for 2Vpp, it should get a little lower for a 1Vpp swing and if you were to increase the loading on each stage a little. 

    -75dBc is a pretty good number at 40MHz, keep in mind these are typical plots and you should anticipate some spread around this (most likely in the worse direction). 

  • 0 in reply to Michael Steffes
    TI__Intellectual 2145 points

    Hi Team

    Thank you for your letter. We haven't found a solution yet,
    Is there a chance to increase the voltage (+ / - 6V - > + / - 7.5V) to get better HD2? How much can it increase?
    Or other models of buffer + differential to single end DAC output amplifier are available

    Best Regards,

    William