ADS127L01: Conversion results

Tool/software:

Hi,

I have setup the device for LL filter and OSR 32 for sampling rate of 512KSPS, we are trying to measure rapid DC voltage changes at a fast rate for our application, we use SPI and have verified the operation of the device. The issue is with the conversion sometimes being the exact same number even with changes to the ADC input, we would expect a small variation in the conversion as a fact. The process involves starting conversion with Pulling START high and monitoring the DRDY signal so we know it is a new measurement every time.

When we change the input more aggressively we see the change until the same number repeats again, we are in the middle of the scale so not close to over or under scale. Below is a sample of the data collected converted to mV. Any feedback would be appreciated.