Alternatives to AD8244

I'm looking for a unity-gain, low-power op-amp to replace an AD8244 as a voltage follower.  I only need one amplifier circuit (not the four that the AD8244 has) and care about low cost, low current draw, ability to run on a single-ended 3.3 V supply and follow a 1.65 V input with noise being no more than a few uV.

Also, I'm a physics PhD student who has done a lot of electronics work, but this is my first experience designing a PCB and working with surface-mount components.  Are certain surface-mount packages easier to work with for relatively inexperienced engineers?

Thanks for your help!

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  • 0
    •  Analog Employees 
    on Jun 7, 2015 6:48 PM

    Hi Jake,

    Thank you for using ADI parts. As for your queries:

    1. Replacement for AD8244 - you can use ADA4805-1 (0.2 µV/°C Offset Drift, 105 MHz Low Power,Low Noise, Rail-to-Rail Amplifier).


               

    Part Number Status Special Features Amps
    per
    Package
    Bandwidth
    -3dB (typ)
    Vnoise Density
    @ Min Gain RTI
    (typ)
    Vsupply
    Span
    (Min)
    (V)
    Vsupply
    Span
    (Max)
    (V)
    Iq per Amp
    (Max)
    Iq per Amp
    (typ)
    Rail-to-Rail
    Out
    Temp Range
    Operating
    Budgetary
    Price
    (USD)
    AD8244 Recommended for New Designs Buffer, FET Input, Precision 4 3 MHz 13 nV/rtHz 3 36 250 uA 180 uA Yes -40 to 85°C 1.81
    ADA4805-1 Recommended for New Designs Buffer, High Speed 1 105 MHz 5.9 nV/rtHz 2.7 10 570 uA 625 uA Yes -40 to 125°C 0.95

    2. Using SMD parts will save PCB space. However, soldering those tiny components may cause difficulty to inexperienced engineers. You can give it a shot and may find it interesting.

    Good luck with your application. I hope this helps.

    Regards,

    Jino

Reply
  • 0
    •  Analog Employees 
    on Jun 7, 2015 6:48 PM

    Hi Jake,

    Thank you for using ADI parts. As for your queries:

    1. Replacement for AD8244 - you can use ADA4805-1 (0.2 µV/°C Offset Drift, 105 MHz Low Power,Low Noise, Rail-to-Rail Amplifier).


               

    Part Number Status Special Features Amps
    per
    Package
    Bandwidth
    -3dB (typ)
    Vnoise Density
    @ Min Gain RTI
    (typ)
    Vsupply
    Span
    (Min)
    (V)
    Vsupply
    Span
    (Max)
    (V)
    Iq per Amp
    (Max)
    Iq per Amp
    (typ)
    Rail-to-Rail
    Out
    Temp Range
    Operating
    Budgetary
    Price
    (USD)
    AD8244 Recommended for New Designs Buffer, FET Input, Precision 4 3 MHz 13 nV/rtHz 3 36 250 uA 180 uA Yes -40 to 85°C 1.81
    ADA4805-1 Recommended for New Designs Buffer, High Speed 1 105 MHz 5.9 nV/rtHz 2.7 10 570 uA 625 uA Yes -40 to 125°C 0.95

    2. Using SMD parts will save PCB space. However, soldering those tiny components may cause difficulty to inexperienced engineers. You can give it a shot and may find it interesting.

    Good luck with your application. I hope this helps.

    Regards,

    Jino

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