CC1310: CC1310 ADC Fixed Reference test

Part Number:CC1310

Hello,

I have tested CC1310F128RHB ADC internal fixed reference with 1.44V and 4.3V with following:

-without TI-RTOS

-input signal 1VDC

-change the power supply from 3.3V to 2.0V

-CCS version: 7.4.0.00015

-SDK: simplelink_cc13x0_sdk_1_60_00_21

My Init Function is

void drvA2D_init (struct drv_adc_cfg *adcCfg)
{
    ADCBufCC26XX_Reference_Source reference;
    ADCBufCC26XX_ParamsExtension customParams;
    ADCBuf_Params adcBufParams;

    ADCBuf_init();

    /* Set up an ADCBuf peripheral in ADCBuf_RECURRENCE_MODE_CONTINUOUS */
    ADCBuf_Params_init(&adcBufParams);

    if(adcCfg->reference == drvADCRefFixed1V44)
    {
        reference = ADCBufCC26XX_FIXED_REFERENCE;
        customParams.inputScalingEnabled = false;
    }
    else if(adcCfg->reference == drvADCRefFixed4V3)
    {
        reference = ADCBufCC26XX_FIXED_REFERENCE;
        customParams.inputScalingEnabled = true;
    }
    else if(adcCfg->reference == drvADCRefVDD)
    {
        reference = ADCBufCC26XX_VDDS_REFERENCE;
        customParams.inputScalingEnabled = false;
    }

    customParams.refSource = reference;
    customParams.samplingMode = ADCBufCC26XX_SAMPING_MODE_SYNCHRONOUS;
    customParams.samplingDuration = ADCBufCC26XX_SAMPLING_DURATION_2P7_US;


    adcBufParams.custom = &customParams;
    adcBufParams.callbackFxn = (ADCBuf_Callback)adcBufCallback;
    adcBufParams.recurrenceMode = (ADCBuf_Recurrence_Mode)adcCfg->mode;
    adcBufParams.returnMode = (ADCBuf_Return_Mode)adcCfg->returnMode;
    adcBufParams.samplingFrequency = adcCfg->samplingFrequency;

    drvADCBuf = ADCBuf_open(adcCfg->adc, &adcBufParams);

    if (!drvADCBuf)
    {
        /* AdcBuf did not open correctly. */
        while(1);
    }
}

In CC1310 datasheet I sow that Typical Characteristics for ADC to VDDS are (1005 to 1006) ADC code for (1.8V to 3.8V)VDDS

But my results are following:

-with using ADCBuf_adjustRawValues() and ADCBuf_convertAdjustedToMicroVolts() functions

-witout ADCBuf_convertAdjustedToMicroVolts() function:

-without ADCBuf_adjustRawValues() and ADCBuf_convertAdjustedToMicroVolts() functions:

I attach you and the exel file with my test(Please visit the site to view this file)