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PCM1774: Frequency response for high impedance termination

Part Number: PCM1774

Hi Team,

What is the frequency response of the DAC output when line out (high impedance termination) is used instead of headphones?

Thanks,

Franz

  • Hi Franz,

    I expect the dynamic performance to be the same or better.  Note that we specify a minimum load of 10kΩ on the output (minimum meaning that lower resistive values = higher current). You can expect better THD+N performance for the whole range as well.

    If you require a curve it, I can check if I have an EVM in storage but it will take a day or two before I can take the measurement.

    Let me know,

    Thanks,

    Paul

  • Hi Paul,

    Can you still take the measurement? The customer would appreciate the frequency response measurement from the output of PCM1774 once with line load and once with 16/32-Ohm load. If possible with different capacitance values on the output lines.

    Thank you,

    Franz

  • Hi Franz,

    I have looked through my inventory and I do not actually have the PCM1774 EVM. I will not be able to take these measurements.  If you would like, you can reach out to me at frost@ti.com and we can discuss this opportunity and how the DAC team can best support it.

    Thanks,

    Paul