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AD9830 range of REFIN voltage from outside source

Hi, 

REFIN of AD9830 can come from external source (see description of REFIN on page 5 on datasheet in link). Nominal value is 1.21V. I am trying to find what are minimum and maximum values that can safely be applied to REFIN. In specifications on page 2, it is given that REFIN input impedance is 10Mohm. 


www.analog.com/.../ad9830.pdf


Thanks.