I have designed an ADS1293 with an external 400kHz oscillator. The oscillator starts with VDDIO from the ADS1293 and is connected to the CLK pin. The fist samples had a problem. I saw a suppressed clock signal when the ADS1293 was in reset state. I added a series resistor and I find out that the CLK pin of the ADS1293 is configured as output. But the datasheet says that EN_CLKOUT is disabled. 0: Clock output driver disabled (default)
After configure the oscillator control register it behaves as expected.
Can anyone explain the behavior?
An other question according to the ADS1293 clock generation. The datasheet doesn't say how to terminate the XTALx pins if the internal oscillator isn't used. Can it be left floating?
Kind regards
Sven