using AD7711

Hi,

I want to use the ad7711 24 bit adc in my arduino project. Does anyone here have experience with this chip or a similar chip like ad7710? I need to know if the chip is defect since it gives maximum readout at input voltage 0V if I use bipolar mode. In unipolar mode it works as expected with half maximum readout at 0V and have a range of approx -1.25 to 1.25 V.

Best, Anders

Nothing known, maybe you need to search on "sigma delta adc" to find a similar one ?