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ADS1281: Data rate to 976.6 s/s instead 1ks/s

Part Number: ADS1281


I have the ADC with the following clocks:
Fclk (system clock)  = 4.000 MHz
SCLK (SPI serial clock) = 2 MHz
I have a sampling rate of 976.6 s/s   (equal to 1/1024).

How is possible to obtain exactly the data rate of 1ks/s?

Maybe I need to use an Fclsk of 4.096 MHz instead 4.000 MHz?
Are there any other actions to obtain a data rate of exactly 1ks/s?
The SCLK frequency influences in some way the data rate?

Thank you very much

Davide Badoni