DAC8760 - no output

Hi,

I'm using DAC8760, and configured it for 4 - 20mA. I've connected 2k and 10 k potentiometers in REFIN and REFOUT respectively. voltage @ REFOUT is 0V. then I disconnected potentiometers from REFIN and REFOUT and connected them to ground thru a capacitor. I've monitored DIN, SCK and LATCH signals on DSO and seems to be OK.

below is the schematic and code, Please guide me, where I'm doing wrong,

#define DAC_CONTROLBITS 0x00553005

#define DAC_ADDRESSBITS 0x00010000

#define DAC_RESETBITS 0x00560001

void Write_Analog_Output( unsigned long int data)
{

    LONG utemp;

    unsigned int temp, t1;  

    INT8 j, k, temp1, l;

    utemp = data;

    temp = (unsigned int) utemp;

    temp1 = (utemp >> 16);

    SD_SDI = 0;

    SD_SCK = 0;

    for(j = 0; j < 24; j++)
    {            

         SD_SCK = 1;    

         if(j < 8)
         {
             t1 = temp1;
             t1 = (t1 >> (7 - j));
         }

         else
         {
             t1 = temp;
             t1 = (t1 >> (15 - l));
             l++;
         }               
   
         if(t1 & 0x0001)
             SD_SDI = 1;
         else
             SD_SDI = 0; 

         for(k = 0; k < 20; k++);

         SD_SCK = 0;

         for(k = 0; k < 20; k++);
     }
     SD_SCK = 0;
     SD_SDI = 0;
   
     LATCH = 1;
     for(k = 0; k < 30; k++);
     LATCH = 0;
}

void Write_DAC(  unsigned long int data)
{
     data = (data | DAC_ADDRESSBITS);
     Write_Analog_Output( data);
}

void Init_DAC()
{
     LONG temp;
	 
     temp = DAC_CONTROLBITS;
     Write_Analog_Output( temp);
}

int main()
{

     delay();
     uc_init();

     Write_Analog_Output( DAC_RESETBITS);

     delay();

     Init_DAC();

     while(1)
     {
        Write_DAC(0xffff);
        delay();delay();
     }

}