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AD9740 IOUTFS dynamic control


I'm considering to control RSET, I'd like to change IOUTFS dynamically.

Device: AD9740

Expected range: 2mA to 20mA

1. At first, Is it possible to change IOUTFS as AD9740 function? Do you recommend to control IOUTFS?

2. If it is possible, could you give me recommended way/circuit to control it?

3. Is there delay which is the time from changing IREF until transmit to IOUT?

BTW, there is the sentence "The small signal bandwidth of the reference control amplifier is approximately 500 kHz

and can be used for low frequency small signal multiplying applications." in AD9740 datasheet, what is this meaning?

Is there any limitation?