signal conditioning for TMS320F28335 eZdsp with hall effect current transducer for 3 phase motor

i want  to  sense 3 phase currents of motor using hall effect sensors  and the transformation is 200A gives 4volt but i use eZdsp that use 3.3V and the full load motor current is 2.5 A and ofcourse it is AC current and dsp dont read -ve values so i need to make signal conditioning to shift the values to be all +ve and reduce voltage to 3.3V 
i make a lot of turns around the hall sensor to increase the sensitivity like 25 turns so when a current of 2A flows the sensor see it 2*25 =50A s t duce larger voltage but i still cant make the signal conditioning