REF5020: Generating 1.8V reference voltage

Hi,
I am designing a board for one of the high precision ADC which supports external reference option.

Following are the specifications for required reference IC:

1. ADC is expected to draw <5mA current from its external reference pin.
2. The required reference voltage is 1.8V.
3. The total RMS noise of reference (1/f and wideband noise) should be less than 19uV.
4. Low power consumption is a good-to-have feature but not the primary requirement assuming reference will not contribute significantly to overall power consumption.
5. Low offset (< 0.1%) and small temperature coefficient (<40ppm/degreeC).

Do you have a part to suggest? I looked at REF5020 but that supports only 2.0V at output. Can we somehow convert it to 1.8V while meeting the

desired specifications? I looked at REF6025 also. But there was no support for 1.8V. I saw LM4032-1.8 too but it is too noisy. Should I consider a shunt reference? Which one?

Thanks for your time and help.

Regards,

Sourabh