STM32H743 - ADC reading higher value

[SR K]

I have connected a sensor in differential mode to the ADC in stm32H743zi. On running the example code provided in CubeMX repository I am able to read the correct value of the sensor. But on replicating it in my application I am not able to read the correct. I am reading a higher value. The voltage on read in multimeter is 100mV but I am getting 150mV on reading the ADC value. The difference between the example code and my code is only on the clock configurations. Will that affect the readings? Below is my adc configuration.

static void MX_ADC3_Init(void)

{

 ADC_ChannelConfTypeDef sConfig = {0};

 hadc3.Instance = ADC3;

 hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2;

 hadc3.Init.Resolution = ADC_RESOLUTION_16B;

 hadc3.Init.ScanConvMode = ADC_SCAN_DISABLE;

 hadc3.Init.EOCSelection = ADC_EOC_SINGLE_CONV;

 hadc3.Init.LowPowerAutoWait = DISABLE;

 hadc3.Init.ContinuousConvMode = DISABLE;

 hadc3.Init.NbrOfConversion = 1;

 hadc3.Init.DiscontinuousConvMode = DISABLE;

 hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;

 hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;

 hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DR;

 hadc3.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;

 hadc3.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;

 hadc3.Init.OversamplingMode = DISABLE;

 if (HAL_ADC_Init(&hadc3) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_1;

 sConfig.Rank = ADC_REGULAR_RANK_1;

 sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;

 sConfig.SingleDiff = ADC_DIFFERENTIAL_ENDED;

 sConfig.OffsetNumber = ADC_OFFSET_NONE;

 sConfig.Offset = 0;             /* Parameter discarded because offset correction is disabled */

 sConfig.OffsetRightShift    = DISABLE;          /* No Right Offset Shift */

 sConfig.OffsetSignedSaturation = DISABLE;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

}

void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)

{

 if(hadc->Instance==ADC3)

 {

  __HAL_RCC_ADC3_CLK_ENABLE();

  __HAL_RCC_GPIOC_CLK_ENABLE();

  HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PC2, SYSCFG_SWITCH_PC2_OPEN);

  HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PC3, SYSCFG_SWITCH_PC3_OPEN);

  /* ADC3 interrupt Init */

  HAL_NVIC_SetPriority(ADC3_IRQn, 0, 0);

  HAL_NVIC_EnableIRQ(ADC3_IRQn);

 }

}