We are using the above part to drive a zero-IF IQ modulator that requires a DC bias of 1.15V. We have set the full scall current to 5mA (Radj = 6.4K). We have set the OTCM to 1V (from REFIO). We have a load resistance of 118 ohms. We are unable to achieve the required DC bias when we set the DAC code to mid-range. A full range DAC code sweep gives a 0.6V swing on each output arm.