The PL System Monitor (SYSMON) pins support analog inputs, single-ended and differential. In bipolar mode, the required common-mode voltage range is +0.5V (min) to +0.6V (max). For more information please check below AMD datasheet links,
Zynq UltraScale+ RFSoC Data Sheet: DC and AC Switching Characteristics (DS926) AMD Technical Information Portal
UltraScale Architecture System Monitor User Guide (UG580) AMD Technical Information Portal
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Please find the detailed product information here:
ZU49/ZU39/ZU29DR RFSoC System on Module