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THS7530

Neil Albaugh
Genius 5430 points
Other Parts Discussed in Thread: THS7530

What is the 1% settling time of the THS7530 to a 10 or 20dB gain step. Not the amplifier settling time-- the settling time due to a gain step.

The data sheet doesn't seem to address this although the gain control BW is spec'ed as 15MHz.

  • 0
    TI__Genius 13935 points

    Hi Neil,

    You are correct there is no information on that parameter in the datasheet.  They also list the 15MHz as "small signal" bandwidth for the gain control circuit. 

    At 38dB/ volt the 10dB step is pretty small at 0.25V, but the 20dB step is ~0.5V which is half of the total range and I doubt that falls under small signal conditions. 

    What settling time does your application require?  Have you tried the model in TINA?

    Regards,

    Loren

  • 0 in reply to Loren Siebert 1
    Genius 5430 points

    Thank you for your reply, Loren.

    Yes, I simulated a small gain step in TINA and it shows a Tr & Tf of about 1.25ns. It would be nice if it could actually do this... but I fear this is a result of yet another poor TI device model. This is a key parameter for a VGA...who is the product line manager?

    I need a step response 1% settling time of 150ns maximum.

    Thanks, Neil   ex-BB