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AMC1306M25: What if the input voltage value exceeds the specified linear range?

Noriyuki Takahashi
Expert 8895 points
Part Number: AMC1306M25

Hi team,

Customer has concerns about the behavior of digital output of AMC1306M25 when the input voltage value exceeds the specified linear range.

The datasheet mentions at 8.3.4 Digital Output that the output of the modular shows nonlinear behavior. But are there any possibilities that the output become lower value than the specified linear range? They want to confirm the output will be monotonic increase even if the input voltage value exceed the specified linear range. Could you confirm this?

The reason why they have concern this, is they had experiences of certain ADC before whose output become unexpected value when the input value exceeds the specified range.

Regards,

Noriyuki Takahashi

  • 0
    TI__Mastermind 46185 points

    Hi Takahashi-san,

    The output will be monotonic increase as shown in Figure 51. Analog Input versus the AMC1306 Modulator Output.

    The region beyond the specified input range is called  "nonlinear" because the analog accuracy specs to not apply outside of the specified input range. However, the output will continue to increase as the voltage level on the inputs increases.