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Choices of amplifiers for AD5781/91

I found that in CN0200 and CN0191, AD8676B and AD8675 are used for both force and sense pins and the output buffer of AD5781/AD5791. The specification of AD8676 is superior, though, the slew rate is limited. We are considering replacing the amplifier to ADA4004 and LT6018, is it worth doing so?

What is the selection criteria for the voltage reference (force and sense) amplifiers and the output amplifiers for 18/20 bit precision DAC?