Hi Masa-san, The ADS124S06 has ESD Ratings as shown in section 7.2 of the datasheet. Although not specifically stated the ESD protection is implied on all analog and digital pins by the Absolute Maximum Ratings where the ESD diodes begin to conduct around 300mV from the supply rails. The ADS124S06 ESD protection is not necessarily good in a system environment, but rather for handling during manufacturing. ESD events within a system can be much higher than the device ratings depending on the operating environment. Series resistance must be high enough to limit current to 10mA through the device pins in over-voltage conditions. Depending on operating environment some other additional circuitry may be required as the resistor protection may not be enough on its own if it is the sole protection method. This may require protection from other sources that can include TVS diodes and/or some other low leakage diodes such as BAV199. Leakage can cause measurement error, so leakage specifications must be taken into account. Best regards, Bob B
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