now i'm working with bipolar inputs on ad7705. my question is: does it requires bipolar reference also?
No, the input stage to the AD7705 is true bipolar. Note that the bipolar ranges are with respect to AIN(−) on the AD7705. So, you can use the AD7705 with bipolar input range of +-100mV from a +2.5V reference and single +5V supply.
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