AD7124-4 AD7124-8 ESD on current output pins


Hi,

Is there a recommended ESD protection circuit for the current output pins on the AD7124-8?  I am using AIN0 and AIN1 to source 500uA of current to measure a 3 wire RTD.  Since these pins are directly wired off the chip and out of the board they will get hit with ESD strikes during CE testing any by our customers.  How do I prevent damage to the IC?

Chuck

  • 0
    •  Analog Employees 
    on Jun 19, 2016 6:27 PM over 4 years ago

    Hi,

    All standard protection schemes are applied to this device internally. It has an internal ESD diodes that can carry quite high currents but only for a short period of time so, they can protect the IC from large pulses of short duration (the total energy is quite low). These ESD protection diodes will clamp the voltage at any pin. The maximum DC current that these protection diodes can withstand is 10 mA. Therefore, the maximum current that can be applied to any input is 10 mA. If it is possible for a current in excess of 10 mA to be applied to a pin due to an over-voltage, external protection is required. Protection schemes that can be applied include transzorbs on the power supply lines, series resistors on digital input lines, and resistors and diodes on analog pins.

    Thanks,

    Jellenie

  • 0
    •  Analog Employees 
    on Aug 2, 2018 3:29 PM over 2 years ago
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin