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TIDA-01525: Delay between input and output

Alexander Hollmark
Prodigy 20 points
Part Number: TIDA-01525

Tool/software:

Hello

I have done some simulations with the TIDA-01525 and found during a transient simulation that there is a delay between the input and the output of around 1.8us. I was wondering what the cause of this delay is and if there is something that can be done to reduce this delay?

Current_Source_TINA.TSC

  • 0
    TI__Mastermind 42113 points

    Hi Alexander, 

    Can you share your schematic file? I suspect this is the overload recovery time of the op amps coming out of the negative rail which I assume you have tied to ground. Try the same voltage step starting from a few hundred millivolts to 1.25V, or add a negative supply to the op amp and check if you see the same delay. 

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    Prodigy 20 points

    Hi. I updated the post with the schematic file. From my testing, it seems that the step is more responsive from a few hundred millivolts than from 0V.

  • 0 in reply to Alexander Hollmark
    TI__Mastermind 42113 points

    Hi Alexander, 

    I played around with the sim a bit as well and it seems like the issue goes away when starting at as little as 10mV.

    Full disclosure I'm in the DAC team and your thread landed in our forum because we own the design you are asking about. The op amp team could help provide some other recommendations if this is an issue. I'm not an expert in all of the different input types that our op amps have that end up causing these issues. If you create a new post with OPA2736 as the part number, it'll land in the right forum.

    Best,

    Katlynne Jones