• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 45 subscribers
  • Views 570 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1210: out of input signal range

Takumi Suzuki1
Mastermind 8610 points

Part Number: ADS1210

Let me ask you a basic question.

In case of inputting out of range analog signal to "Ain" pins, what will happen?

1) in case of the input is out of spec, under absolute max range.

    For example, Analog input signal is from -0.2V(>-0.3V) to 5.2V(<5.3V) at AVDD is 5V. 

2) in case of the input is over "absolute max value", under -0.3V to over 5.3V at AVDD is 5V.

    In this case, it maybe the device broken..if not broken, there maybe something degradation happened on the device.

    The input capacitor may become worse?

Thank you for your kindness.

Best Regards,

  • 0
    TI__Guru** 113765 points

    Hi Suzuki-san,

    With CMOS devices in particular, it is commonplace to put an ESD device similar to a diode from the input to both supply rails.  When these ESD devices begin to conduct, there is a 'diode' connection from the input to the supply rail.  This input current must be limited to 10mA of less or the 'diode' can be damaged as they are not rated to conduct a large current.  Current can be limited by using a series resistance.

    If the input voltage is less than the voltage required for conduction, then nothing should degrade the ADS1210.  However, if there is conduction and the current is significant, then damage can occur to the ESD structure which can range from a direct short, to a non-linearity in the measurement.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Mastermind 8610 points

    Hi Bob-san,

    Thank you for your reply !

    I understood.

    Best Regards,