CC3220S-LAUNCHXL: Questions about ADC.h

I have a question on how the ADCs work using ADC.h.  Are the 4 ADC inputs multiplexed?  Also, how do I disconnect the ADC from the pin when I'm not wanting to sample it.  Does ADC_close() do that?  The reasons I ask is because I see samples every 62.5kHz on the pins so it seems like it just continues to sample.  I just can't seem to track it down in the code what is actually happening.  I'm currently including ADC.h just like the following example from the SDK (adcsinglechannel.c).  Should I be using ADCCC32XX.h instead?

/*
 *  ======== threadFxn0 ========
 *  Open an ADC instance and get a sampling result from a one-shot conversion.
 */
void *threadFxn0(void *arg0)
{
    ADC_Handle   adc;
    ADC_Params   params;
    int_fast16_t res;

    ADC_Params_init(&params);
    adc = ADC_open(Board_ADC0, &params);

    if (adc == NULL) {
        Display_printf(display, 0, 0, "Error initializing ADC channel 0\n");
        while (1);
    }

    /* Blocking mode conversion */
    res = ADC_convert(adc, &adcValue0);

    if (res == ADC_STATUS_SUCCESS) {

        adcValue0MicroVolt = ADC_convertRawToMicroVolts(adc, adcValue0);

        Display_printf(display, 0, 0, "ADC channel 0 convert result: %d uV\n", adcValue0MicroVolt);
    }
    else {
        Display_printf(display, 0, 0, "ADC channel 0 convert failed\n");
    }

    ADC_close(adc);

    return (NULL);
}