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question about LTC2292 REFH/REFL capacitor network

Category: Datasheet/Specs
Product Number: LTC2292

Im looking for opportunities for simplifying BOM in circuit using LTC2292 ADC. The figure  9 in datasheet shows 1µF ceramic capacitor coupling to ground, but the datasheet does not explain what is the reason for that a exact value. Is it possible to change that capacitor to 2.2uF? What will be the result/drawback of that change? I want to sample a signal  in a frequency range of 50-100kHz@40Msps.