To avoid excessive loading the maximum external load driven should be much larger than the internal source resistance.
100kohm load would receive 25uA.
MAX11629
Production
The MAX11626–MAX11629/MAX11632/MAX11633 are serial 12-bit analog-to-digital converters (ADCs) with an internal reference. These devices feature on-chip...
Datasheet
MAX11629 on Analog.com
To avoid excessive loading the maximum external load driven should be much larger than the internal source resistance.
100kohm load would receive 25uA.