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INA159: PCB layout and capacitor position

xingwitt
Prodigy 140 points
Part Number: INA159

Hi team,

I didn't find the recommended PCB layout for INA159 in user manual or other documents.The 5 and 6 pins of the its output are directly connected in the circuit.

Do I have these two pins copper poured in the PCB, or connect them by wires (there will be sharp angles during the backend), connect the 5 pins to the 6 pins at right angles?Which one is better?

Also, If I put an RC low-pass filter on the output to connect the ADC (one of the typical applications in the manual)，What should be the placement of the RC? Is it a good idea to have capacitor for RC close to the ADC pins rather than to the INA159?

  • 0
    Guru 284590 points

    To connect pins 5 and 6, nothing special is needed, as long as the traces are not too long. (If there is not enough place for a solder mask between the pins, the solder on a direct connection might look like an accidental short.)

    When you place the capacitor near the ADC, the higher-frequency signals go over the long trace and might increase EMI. When you place the capacitor near the INA, there will be some trace resistance/inductance between the buffer capacitor and the ADC input. I doubt that either of these will have much of an effect.

  • 0
    TI__Mastermind 23490 points

    Hello, 

    I agree with Clemens. Let us know if we can be of further assistance. 

    Best Regards, 

    Chris Featherstone