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LMH6401: unipolar power supply: SPI voltage levels

Genius 12635 points
Part Number: LMH6401

Hello Team,

can you confirm that the voltage levels for the SPI interface always are 1.8V (high) and 0V (low) no matter if unipolar or bipolar power supply is used, please?

VS- = 0V connected to GND

VS+ = 5V 

SPI-Bus voltages are referenced to 0V? 

Thanks and Best Regards, Hans