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MSPM0L1306: can Vref- connect to negative voltage?

Frank(EP) Liu
Expert 4970 points
Part Number: MSPM0L1306


Tool/software:

hi,

the input signal is +/-100mV, can i connect Vref- to negative voltage for ADC? So, MCU can measure the signal level.

BR,

frank

  • +1
    TI__Expert 3471 points

    Hi Frank,

    Typically VREF- is connected to GND:

    I would not suggest applying a negative input as it can forward-bias the ESD diodes,

    I would suggest level shifting the signal or using a differential amplifier with the device's OPAs.

    Best,

    Owen