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THS4521 for audio application.

Jeff Yen
Prodigy 40 points
Other Parts Discussed in Thread: THS4521

Dear Sir, 

I have a customer use THS4521 for Single-Ended Input to Differential Output application but the signal was be attenuate before 60Hz, please advice what cause this issue and how should we do to increase the voltage in the low frequency.   The RG and RF is the same for 56K ohm.

Thank you. 

Best regards,

Jeff Yen

   

  • 0
    TI__Mastermind 22825 points

    Hi Jeff,

    You don't mention the differential impedance the 10uF output caps (C250 and C251) drive into. If that is a 100ohm load, then 10uF needs to be increased in order to not attenuate 60Hz. In simulation I see a low frequency -3dB bandwidth of 320Hz (anything below 320Hz will be attenuated more than 3dB).

    The simulation file I have used is here:

    8802.THS4521 7_25_14.TSC

    Is there anyway you can raise the value of C250, C251 (or increase the differential load, which I've assumed to be 100ohm) to lower the -3dB frequency?

    Also, I recommend that the inverting input resistor (56k) to get a 4.7uF cap in series (as in my simulation file above) in order to make the input symmetrical compared to the non-inverting input (cap driven from IC202).

    Regards,

    Hooman

  • 0 in reply to Hooman Hashemi
    Prodigy 40 points

    Dear Hooman, 

    Thanks for your advice, we will have a test with it and back to you the result. 

    Thanks. 

    Best regards,

    Jeff