Part Number: ADS1256 Tool/software: Hi Team, I have developed a board with the ADC mentioned. The ADC is about 8 cm from another board (same reference) in which a 5nF capacitor is discharged through a 3MΩ resistance. The voltage stored in this capacitor is 5kV. This system has been in production for about 1 year without any detected problems until now. The last boards produced are experiencing an issue related to the ADC. The ADC is powered by a 5V regulator for its analog section and a 3.3V regulator for its digital section. When the discharge occurs, the 3.3V digital regulator (which has an internal limit of 100mA) drops to approximately 2V. The 5V analog section remains unaffected. I have found that the ADC is causing this issue. If I change the discharge resistance to 150MΩ (The discharge resistance must be < 3MΩ ), the problem does not occur. This issue has never happened before. Could you help me with this?
↧
