I would like to add a TVS and a series resistor to protect against ESD (2KV) events but the low max input voltage (VDD+0.3V) on the analog pins seems very low. Can you suggest any TVS components that have a Vbr low enough to protect this device?
TVS + series resistance is a good approach to increase the ESD protection on this device.
The LTC2983 has ESD structures to protect against 2kV HBM - a guideline for this family is to provide series resistance to limit the current through these ESD structures to less than 10mA.
When using an external TVS look for a low leakage part so the series resistance won't create an offset voltage.
The VDD+0.3V is for continuous voltages applied to the input pins but these devices *do* have some ESD built-in as per LTC's reliability plan.