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LTC2497 off isolation

Dear Sir,
This is Phat Nguyen from Ampere Computing Vietnam. I'm working in Hardware platform design for data center. I used the LTC2497 to read voltage ADC. I see in LTC2497's datasheet, when controller is off (VCC=0), the QIRR = 120dB. It means the input will be High-Z, is it correct?
I appreciate for your feedback.