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how to choose the proper OPAs in TI website?

william.ho
Prodigy 40 points
Other Parts Discussed in Thread: OPA1678, OPA1679, OPA1642, OPA1692, OPA1662, OPA1622, OPA1688, INA1620

Hi,

So many OPA chipsets in TI websits , how could i know which is better and suit for my application because of little difference between them,  do you have some suggestions on audio amplifiers ? for example , some roadmap on audio amplifier , or the comparaion between these OPAs.

My application scenarios is below:

1. MIC amplifier

2. Microphone Amplifier

Thanks and Regards

William

  • 0
    TI__Genius 12910 points
    Hi William,
    We have published an audio selection guide (www.ti.com/.../slot140.pdf) which gives a comparison of many of our audio devices.

    As far as which amplifier to select for a given application, that's going to depend a lot on what specifications you're targeting. A bipolar input op amp will have lower voltage noise, but its higher current noise is problematic when working with high-impedance inputs. FET and CMOS input op amps have higher voltage noise than bipolar amplifiers, but have very low current noise, which often makes them a better choice when interfacing with high impedance sources.

    Other concerns would be cost, power consumption, especially in battery powered applications, and more.

    A few good building-block audio op amps:
    OPA1678/OPA1679 - FET input, low cost, good performance. Good noise performance (4.5nV/rtHz at 1kHz).
    OPA1642 - FET input, lower distortion than OPA1678, but higher cost. Higher broadband noise (5.1nV/rtHz at 1kHz) than OPA1678, but lower 1/f noise
    OPA1692 - Bipolar input, very low power (650µA/channel)
    OPA1662 - bipolar input, low power.

    For higher output power applications, like headphone drive:
    OPA1622 - bipolar
    OPA1688 - FET
    INA1620 - bipolar
  • 0 in reply to Alex Davis
    Prodigy 40 points

    Hi， Alex

    Thanks a lot for your quick response. it is very helpful for me.

    William