AD7568: Input impedance

Q AD7568 uses R-2R ladder, my customer wants to know what is the value of the R used in the ladder. A The input impedance of the R-2R DAC is R, that's inherent in the design. See figure 13 in datasheet working from right to left. 2R || 2R = R R+R|| 2R = R etc etc. So R of ladder is equal to input resistance which varies from a min of 5K to a max of 9K with a typical of 7K. Please note your simulation may need to do a Monte Carlo analysis/simulation with R_tolerance/temperature in mind.

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AD7568 Production
The AD7568 contains eight 12-bit DACs in one monolithic device. The DACs are standard current output with separate VREF, IOUT1, IOUT2 and RFB terminals...
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AD7568 on Analog.com