ADXL357 DRDY pulse priod for EXT_SYNC = 01, EXT_CLK =1

I'm using ADXL357 using external clock.

I look into the datasheet descriptons and Figure76.

I understand

 1. external clock should be 1.024MHZ on INT2 PIN

 2. SYNC pulse on DRDY should have at least 2.91us width and it's rising edge should have 25ns setup time 

      to external clock.

When I like to have 1kHz ODR. 

Do I need to set ODR_LPF to 0010 in register(0x28) [3:0] ?

Should  SYNC pulse period on DRDY be 1kHz?

What else do I need to do?