the circuite is almost the same as the reference in the datasheet of ADS62P42IRGCT. it is shown below
when i test the idle noise of the circuite(call it be called "offset"? ).the first channel is about 15,while second is about 100.for the consistency of the two channels, i changed the value of the resistors in the circuite above, while keep the sum of them constant .But the idle noise did not change or only a little ,is still about 95. Can you give me some advices?