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OPA2691: Output Overdrive Recovery

Kiran Gothe
Prodigy 20 points
Part Number: OPA2691
Other Parts Discussed in Thread: OPA2846

Hello

We are using OPA2691 op amp with dual supply of +/- 3.3 V in a SiPM based application in our Gamma Ray Astronomy experiment.  What is the typical output overdrive recovery time of this Op amp? 

Thanks and regards,

Kiran Gothe

  • 0
    Guru 48195 points

    Hello Kiran,

    The overdrive recovery is usually very dependent on the external circuitconfiguration. you would need to set up the EVM how you intend to use it and test it - overdrive recovery is not modeled

    This dual CFA device is a bit high on noise for a SiPM app I would think, if you need a dual, look at the OPA2846 decomp VFA. 

  • 0 in reply to Michael Steffes
    Prodigy 20 points

    Dear Michael,

    Thanks for your quick reply.

    I was thinking if you have modelled the parameter using a typical test circuit. 

    Yes, OPA2846 is a good candidate for our application due to lower noise. However, we are using Transimpedance amplifier (based on BJT) on the front end to boost the Signal to Noise ratio before further amplifying the signal using OPA2691. Therefore we thought, OPA2691 although higher on noise is good enough for our application. Also keeping  the power consumption to lowest possible level is our prime consideration. From that point of view, OPA2691 is relatively better due to lower operating  supply voltage (+/- 3.3 V)  and much lower quiescent current per channel. 

    Thanks and regards,

    Kiran Gothe