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ADA4932 signal source is pulled low when the single-ended signal is input

Question asked by lijiebiter on Jun 22, 2017
Latest reply on Aug 6, 2017 by JinoL

Rf=499  Rg=499  Vocm=2.5V  Vs=7V  -Vs=-2.5V

Input single end signal, when input dc 1.25V~5V, output is right, when input dc 0~1.25V, output is wrong, output always is 1.1V,  input change to 1.1V too.  Who can tell me why? Thanks.