Cora Z7-10 XADC

[Creative]

Hello,

Can the differential input xadc pins A6-A11 of cora z7-10 take input range -0.5v to +0.5v instead of 0v to 1v? In Cora z7-10 reference manual it is stated that it can take input voltage range from 0v to 1v but i have worked in zybo board's XADC which could take differential ADC input voltage from -0.5v to +0.5v. Could anyone clarify on the range of input volatges for differential XADC on CORA z7-10 Board?

Thank You.

[jpeyron]

Hi @Creative,

The ADCs have a nominal analog input range from 0V to 1V. In unipolar mode (default), the analog inputs of the ADCs produce a full scale code of FFFh (12 bits) when the input is 1V. In bipolar mode, the ADCs use two’s complement coding and produces a full scale code of 7FFh with +0.5V input and 800h with –0.5V input. My understanding is that you can use either mode on the Cora Z7-10. Here is the 7 Series FPGAs and Zynq-7000 SoC XADC Dual 12-Bit 1 MSPS Analog-to-Digital Converter User Guide.

thank you,

Jon