ADS1675 data output conversion formula

Hi All,

ADS1675 24 bit word is signed and input voltage range is +-3V, inputs greater than 3V produce digita output of 7FFFFFh and less than -3V of 800000h.

i'm wondering if the conversion formula for every voltage input in the range to obtain the measured voltage is simply:

((output code)/7FFFFF))*3 = Vin

I found according output codes applying this formula to measure a known voltage source of 1.43V applied on input at lowest data rate [DR2:0] 000 and fpath and ll_config both 0 with the lowest CLK input of 8Mhz, but when i've tryed to apply full CLK of 32Mhz the output code with that formula led me to 2.5V input always with 

the same 1.43V...