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AD9830 range of REFIN voltage from outside source


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.