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Can I use OPA340 to drive a 1.5MHz sampling frequency ADC

Yun FANG
Intellectual 310 points
Other Parts Discussed in Thread: OPA340, OPA350, THS4521

I see in the datasheet of OPA340, it is suitable to drive a 100kHz sampling converter. I would like to know whether it could be used in even high speed converter.

How to do the analysis?

Thank!

  • 0
    TI__Guru 60570 points

    Yun,

    You do not specify how many bits ADC you're considering to use but regardless OPA340 most likely will NOT be fast enough to drive 1.5MHz sampling converter; please consider instead OPA350 or THS4521.

  • 0 in reply to Marek Lis
    Intellectual 310 points

    Hello Marek

    Thanks for your feedback. I would like to use it for 12 or 14 bits ADC. Even OPA350 only specify it is suitable for 500kHz sampling. Another reason I don't choose OPA350 because of the Quiescent current is 5.2mA, it is higher than my expectation. Also I see THS4521 is a very high performance Op Amp with dual supply and differential output. While our design is try to use single-ended output. I guess the price for THS4521 is high and it is not cost effective for our project.

    Now I am try to drive a 12 bit ADC. The clock is 48MHz. The sampling time is 12.5 clock, and the conversion time is also 12.5 clock. While Cs=5pf. Do you have some suggestion?

    Thanks