ADC Problem on TMS320F28335

We are developing with the DSP TMS320F28335 PGF controlCARD Release 1.0 (and USB-EMU R3 docking station) and we are having trouble reading the ADC.

We tried using the sample code from the "C2833x C/C++ Header Files and Peripheral Examples" and we are still getting unexpected values from the ADC.

We are using the Example_2833xAdcSoc.c (ADC SOC example), and we have put a 1V DC voltage on ADC A3. According to the documentation - we should see a value of 1365 (4096 * 1 / 3) in the  ADCMIRROR.ADCRESULT_MIRROR0 register.... However we get a values of between 37 and 85.

Furthermore - if we change the code to use a different channel we get different values again, even though the voltage is the same.
What am I missing? Any 28x ADC experts out there...Can anyone suggest what my issue could be?

I've included my register values (after ACDRESULT_MIRROR is read) and code listing below FYI.

Thanks in Advance.

ADCTRL1 = 0x0000
ADCTRL2 = 0x0900
ADCTRL3 = 0x00E0
ADCST = 0x0001
ADCMAXCONV = 0x0000
ADCCHSELSEQ1 = 0x0003
ADCASEQSR = 0x0001
ADCREFSEL = 0x1B1D
ADCOFFTRIM = 0x0009
ADCRESULT = 0x0450
ADCRESULT_MIRROR_0 = 0x0045

main()
{

   InitSysCtrl();

   EALLOW;
   #if (CPU_FRQ_150MHZ)     // Default - 150 MHz SYSCLKOUT
     #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3)   = 25.0 MHz
   #endif
   #if (CPU_FRQ_100MHZ)
     #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2)   = 25.0 MHz
   #endif
   EDIS;

   DINT;
   InitPieCtrl();

   IER = 0x0000;
   IFR = 0x0000;
   InitPieVectTable();

   EALLOW;  // This is needed to write to EALLOW protected register
   PieVectTable.ADCINT = &adc_isr;
   EDIS;    // This is needed to disable write to EALLOW protected registers

   InitAdc();  // For this example, init the ADC

// Enable ADCINT in PIE
   PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
   IER |= M_INT1; // Enable CPU Interrupt 1
   EINT;          // Enable Global interrupt INTM
   ERTM;          // Enable Global realtime interrupt DBGM

   LoopCount = 0;
   ConversionCount = 0;
   
   AdcRegs.ADCMAXCONV.all = 0x0000;       // Setup 1 conv's on SEQ1
   AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.
   AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
   AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1;  // Enable SEQ1 interrupt (every EOS)

// Assumes ePWM1 clock is already enabled in InitSysCtrl();
   EPwm1Regs.ETSEL.bit.SOCAEN = 1;        // Enable SOC on A group
   EPwm1Regs.ETSEL.bit.SOCASEL = 4;       // Select SOC from from CPMA on upcount
   EPwm1Regs.ETPS.bit.SOCAPRD = 1;        // Generate pulse on 1st event
   EPwm1Regs.CMPA.half.CMPA = 0x0080;      // Set compare A value
   EPwm1Regs.TBPRD = 0xFFFF;              // Set period for ePWM1
   EPwm1Regs.TBCTL.bit.CTRMODE = 0;          // count up and start

// Wait for ADC interrupt
   for(;;)
   {
      LoopCount++;
   }

}


interrupt void  adc_isr(void)
{

  Voltage1[ConversionCount] = AdcMirror.ADCRESULT0;

  // If 40 conversions have been logged, start over
  if(ConversionCount == 9)
  {
     ConversionCount = 0;
  }
  else ConversionCount++;

  // Reinitialize for next ADC sequence
  AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;         // Reset SEQ1
  AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;       // Clear INT SEQ1 bit
  PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE

  return;
}