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Different specification on AD7691

Question asked by solar on May 24, 2016
Latest reply on Jun 9, 2016 by jcolao

I want to try an 18 bit ADC with an evaluation board and have thought of AD7691. However, when looking at it I find different specifications:


Here it says 16 bits on the evaluation board:


PulSAR ADC PMODs [Analog Devices Wiki]


And then about the reference voltage here it says from 2.3V to Vdd


And here from 0.5V to Vdd.


I am actually interested in using a low Vdd ( 0.6V aprox)and 18 bits so could you please tell me which of all these is correct.


Also in the datasheet I see that SNR decreases with decreasing Vref, however it is only shown until 2.3V. How low does it go to at 0.5V.


thank you