Yes you can. 500ksps is the maximum sampling rate. The sampling rate can be controlled between 10 ~ 500 kSPS using CNVST.
MAX11156
Production
The MAX11156 18-bit, 500ksps, SAR ADC offers excellent AC and DC performance with true bipolar input range, small size, and internal reference. The MAX11156...
Datasheet
MAX11156 on Analog.com
Yes you can. 500ksps is the maximum sampling rate. The sampling rate can be controlled between 10 ~ 500 kSPS using CNVST.