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ADS8866: Sometimes DOUT remains low

Part Number: ADS8866
Other Parts Discussed in Thread: ADS8325

We use ADS8866 for measuring analogue signals. We use 3 wire mode. Supply voltage is 3V, supply voltage for reference is 3V switched (to reduce power consumption).

In most cases I get data on DOUT. But sometimes DOUT remains low and in that case supply current is approx. 2mA higher. The only way to get ADC working is a power on reset. Is it possible that we enter a Special ADC state (TI uses for production test)?

In the old desing we use ADS8325 and we never had such Problems!