Hi,
I am using the AD9706 in an application. Right now I have the device input voltage set to 1.8V.
This would give:
Ioutfs = 2mA
Iref = Ioutfs / 32
Iref = 2mA / 32
Iref = 62.5uA
Vrefio = 1.025V
Datasheet states:
Iref = Vrefio/Rset which equals Vrefio/Iref = Rset
For my values above
Rset = 1.025 / 2m
Rset = 1.64k
The datasheet states:
"The control amplifier allows a 5:1 adjustment span of IOUTFS from 1 mA to 5 mA by setting IREF between 31.25 μA and 156.25 μA (RSET between 6.4 kΩ and 32 kΩ)." The calculated value of 1.64k is not even in the scale for what the datasheet states though I am assuming that this is in reference to 3.3V input in which Ioutfs = 5mA.
So for the device to work properly what would the value of Rset be for 1.8V? I would assume that it should be 1.64k though some preliminary testing has shown otherwise where having a 6.49k value for Rset gave me Ioutfs = 2mA . . . please clarify.
Regards,
Jordan
