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AD7367 - BUSY is not going HIGH at the falling edge of CNVST.

I am planning to use AD7367-5 for bipolar range of ±5V analogue input signal. The circuit was designed based on the reference design given in the datasheet (page 18/28 or refer image below) with changes in the RANGE selection. RANGE0 = 1, and RANGE1 = 0 for ±5V analogue input signal. However, then I tried to trigger the conversion by pulling the CNVST low and wait until the BUSY becomes HIGH, it waits forever. Turns out the BUSY is not turning HIGH at all. Please advice if i have missed any details or any methods to debug. I have tried resetting by pulling pin ADDR,RANGE0 & 1 to high but still its the same.