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DDC264EVM: DDC264EVM: Resistors at DDC264EVM Input

Part Number: DDC264EVM

I have a question about DDC264EVM. I've put a Silicon photodiode at Vin input and looking the output on the DDC264 Evaluation software. my question is that when we are using SiPD what's the effect of Resistors at the input and why they are used in the circuit? because in another question I asked about DDC264 and DDC232, your experts said that DDC have sufficient protection and don't need extra.