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ADS1299EEGFE-PDK: data acquisition speed

Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299, ADS1298

I am testing both ADS 1299 and 1298 EVM.  The data acquisition speed of ADS1299 is significant slower  than ADS1298.  is the data acquisition speed adjustable? if yes. how? why the data acquisition speed of 1298 is faster than ADS1299?