The step size of an ADC (Analog-to-Digital Converter) is the smallest change in input voltage that can be resolved by the ADC.

Enter:

- Reference Voltage
**Vref** - Number of bits (
**n**)

The tool will provide the step size in Volt, Millivolt, Microvolt or Nanovolt.

**Formula**

The step size of the ADC is given by the formula:

**(2*Vref)/2 ^{n}**

**Example Calculation**

For a **12-bit ADC** and a reference voltage equal to **3.3 V**, the step size is **1.6 mV**.

As the number of bits increases, the step size decreases thereby increasing the granularity in voltage values that can be detected and measured by the ADC.

**What is ADC Reference Voltage?**

The reference voltage sets the maximum input voltage the ADC can convert and determines the resolution of the digital output.

**Types of Reference Voltages**

**Internal Reference**: Some ADCs have an internal reference voltage that is generated within the ADC itself. This is convenient and ensures that the reference voltage is stable and accurate.**External Reference**: In other cases, an external reference voltage can be supplied to the ADC. This allows for flexibility in choosing the reference voltage and can be beneficial for applications requiring a very precise and stable reference.

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