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INA226-Q1: Spec Inquiry

Evan Wang
Genius 10220 points
Part Number: INA226-Q1
Other Parts Discussed in Thread: INA226

Hi TI Expert,

Few questions about the INA226-Q1 hope you can help to clarify:

  1. May I know how to judge whether this current sensor can support uni-direction or bi-direction if datasheet didn't mention about it?  If the VIN+ - VIN- can accept both positive/negative voltage, does that means it can support bi-directional?

image.png

 

2. May I know how to judge the Bandwidth limitation on IN+/IN- signal? Should I just use the below graph and find the related frequency range before reach -3dB gain? So for INA226-Q1, I think it will be around 400kHz, is that correct?

image.png

 

Thank you.

  • 0
    TI__Mastermind 27015 points

    Hello Evan,

    Here are my responses to your questions:

    1. Correct, the INA226 is bi-directional.

    2. The bandwidth depends on your chosen conversion time, averaging settings, and the number of channels converting. For example, if you are converting for only the shunt voltage at 140µs, then the sample rate would be 1/140µ ≈ 7.143kHz. If you are converting for both shunt and bus voltage, with 140µs conversion on each, then your sample rate would be 1/(140µ+140µ) ≈ 3.571kHz. The plot in Figure 5-1 is for a single channel conversion of 1.1ms, which would be a sample rate of 1/(1.1m) ≈ 909Hz. From the plot, you can see that the -3dB point is approximately half of the sample rate. This will scale with your conversion settings. 

    Regards,

    Mitch

  • 0 in reply to Mitch M
    TI__Genius 10220 points

    Hi Mitch,

    Sorry for the late response.

    So based on the info in Figure 5-1, we can just use half of the sampling rate as the frequency response rate?

     

  • +1 in reply to Evan Wang
    TI__Mastermind 27015 points

    Yes, that would be a good approximation of the -3dB point.