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LTM9013 datasheet clarification request

Hi,

I'm considering designing a board using the LTM9013 and require some help.

In the datasheet on page 4, the REF input (demodulator adjust input) specifies a min and max  range of 0.4 - 0.7 volts. On the other hand the reference schematic on page 31 connects to a voltage that I think is half of VDD (1.8V) which is 0.9V.

What is the correct input range for this pin?

Thanks.