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LOG114: Schematic review

Kevin Xiong
Expert 2340 points
Part Number: LOG114

Hi,

Could you please review the schematic for our customer as attachment? Thank you so much!

Kevin Xiong

  • 0
    TI__Guru 51456 points

    HI Kevin,

    The overall circuit appears to follow the correct configuration similar to Figure 2 on the LOG114 datasheet.  The LOG114EVM / datasheet examples suggest bypass capacitors for the V+/V- supplies but do not include a REF bypass capacitor.  One potential concern may be stability due to the large bypass capacitor on VREF of 1μF.  I will review in the device documentation to see if there are any concerns due to reference stability on my side; but we could consider removing since it is not required.

    If you would like me to verify the passive resistors component values, please let me know what is the minimum/maximum current range of I1 required in this application. Also, let me know the required output voltage range requirement for signal 'Sig1".   This will allow us to ensure the gain and offset of amplifier A4 is also configured properly.

    Thank you and Regards,

    Luis