How can I get the LIS2DH12 accelerometer speed at 1.344 kHz as mentioned in the datasheet from thingy52?

How can I get the lis2dh12 accelerometer speed at 1.344 kHz as mentioned in the datasheet from thingy52? 

I have configured the registers as per datasheet of the accelerator lis2dh12, but iam getting sample rate around 400, but not achieving 1.344kHz, Can anyone please suggest how can I achieve that? Is there any additional steps or method in the Zephyr OS?

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