Basic electrostatic discharge (ESD) circuitry protects the ADS131M02-Q1 inputs from ESD and overvoltage events in conjunction with external circuits and assemblies. Figure 8-1 depicts a simplified representation of the ESD circuit. The protection for input voltages exceeding AVDD can be modeled as a simple diode.

Figure 8-1 Input ESD Protection Circuitry

The ADS131M02-Q1 has an integrated negative charge pump that allows for input voltages below AGND with a unipolar supply. Consequently, shunt diodes between the inputs and AGND cannot be used to clamp excessive negative input voltages. Instead, the same diode that clamps overvoltage is used to clamp undervoltage at the reverse breakdown voltage. Take care to prevent input voltages or currents from exceeding the limits provided in the Section 6.1 table.