F6638 Internal temp sensor read is radically incorrect

I'm getting some radically incorrect-seeming values from the internal temp sensor on the ADC on my MSP430.  I copied and pasted code from the example fiile msp430f66xx_adc_10.c:

		ADC12_A_clearInterrupt(ADC_BASE,ADC12IFG0);
		 REFCTL0 &= ~REFMSTR;                      // Reset REFMSTR to hand over control to
		                                            // ADC12_A ref control registers
		  ADC12CTL0 = ADC12SHT0_8 + ADC12REFON + ADC12ON;
		                                            // Internal ref = 1.5V
		  ADC12CTL1 = ADC12SHP;                     // enable sample timer
		  ADC12MCTL0 = ADC12SREF_1 + ADC12INCH_10;  // ADC i/p ch A10 = temp sense i/p
		  // ADC12IE = 0x001;                          // ADC_IFG upon conv result-ADCMEMO
		  for(nTimeout=0;nTimeout<30;nTimeout++)                         // Delay to allow Ref to settle
		    ADC12CTL0 |= ADC12ENC;

		    ADC12CTL0 &= ~ADC12SC;
		    ADC12CTL0 |= ADC12SC;                   // Sampling and conversion start

		    while( !(ADC12_A_getInterruptStatus(ADC_BASE,ADC12IFG0)) );

		    nTimeout = ADC12MEM0;

		    // Temperature in Celsius
		    // ((A10/4096*1500mV) - 680mV)*(1/2.25mV) = (A10/4096*666) - 302
		    // = (A10 - 1858) * (666 / 4096)
		    nTimeout = ((nTimeout - 1858) * 666) / 4096;

		    // Temperature in Fahrenheit
		    // Tf = (9/5)*Tc + 32
		    nTimeout = ((nTimeout - 1858) * 1199) / 4096 + 32;

..I'm getting values in ADC12MEM0 upwards of 2150 (decimal), whici converts into a pretty weird temperature considering the ambient in here is about 73f.

Is there anything blantantly wrong here?  I assumed that a sample would work (all the otrhers I've looked at have).

All info appreciated!

Ed Averill