DAC7760: CRC FLT alarm and no correct output

Part Number:DAC7760

Hi all,

When CRC is disable, DAC7760 is working fine but when crc is enable DAC output is misbehaving and CRC_FLT flag bit is set. On powerup both(disable and enable CRC) has same sequence

RESET(); //3bytes

NOOP(); //3bytes

CONTROL(); //3bytes

CONFIG(); //3 bytes

if(crcenable == 1)

DAC_4DATA();  // 4bytes

else

DAC_3DATA(); //3 bytes

DAC OUT when CRC is disable linearly increasing

DAC OUT when CRC is enable randomly increasing 

Note: I had tried other sequence in CRC enable mode but there is no DAC OUT