How to approach CDAC of SAR using SPICE

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Joined May 4, 2020
I am modeling SAR ADC from scratch I am going through TI precision instruments adc videos. Here they have mentioned in 9:25 they have assumed Ref capacitive load as Csh/4 and carried conversion cycles. I am not able to relate this with actual CDAC capacitor redistribution process. How to approach and model CDAC in LTSpice considering this datasheet ADS8881 which consists of CDAC.