Hello Scott, Thank you for your patience. Answers are shown after your question below. 1. Is it normal for these kind of failures when there is no input protection circuitry? Answer: The analog inputs have internal protection diodes to protect against overvoltage. However, if the analog inputs continue to experience voltages that exceed 300mV, then the ADS1015 can be permanently damaged. The type of failure seen by the user depends on the extent of device damage, circuit configuration, or application. 2. Will input protection circuitry prevent these failures or is there some other possible cause? Answer: To prevent analog input damage, the analog input voltages should be within the range show by equation GND – 0.3 V < V(AINX) < VDD + 0.3 V. To aid in protecting against overvoltage, place current limiting resistors on the input lines that will allow up to 10mA of current. As a general practice, work inside an ESD safe environment. 3. What is the recommended input protection? Answer: Please, see answer to question 2 above. 4. Should unused input pins be tied to something? Answer: The unused analog input pins can either float (not-connected) or be tied to GND. Best Regards, Henry Sarmiento
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