How much ESD can the ADG788 take? - it is not written in the datasheet.
ESD testing was according to FICDM and HBM model, test results for ADG788:
Field-Induced (Robotic) Charged Device Model (FICDM),Class C6, Highest Pass
Level 1500V, First Fail Level 2000V
(ESD test spec. ESD Assoc.STM5.3.1-1999)
Human Body Model (HBM) Class 1C, Highest Pass Level 1000V, First Fail Level
(ESD test spec. ESD Assoc. STM5.5.1-2001)