Is it possible to set the output current to lower than 2 mA? I suspect that the minimum current rating of 2 mA is a guaranteed to be able to output at least 2 mA. Put another way, is there a maximum value for the IREF resistor? I would like to be able to set the current to 0.5 mA in my application which would require an IREF resistance of 105k-ohm. VCC and VLED are 3.3V in my application.