ADC Resolution Calculator Analog to Digital

Calculate bits, steps, voltage resolution & LSB for ADCs

📊 ADC Resolution (bits)

🔢 Custom Bits

⚡ Reference Voltage (Vref) V

📊 Input Voltage V

🔌 ADC Type

📈 PGA Gain

📖 ADC Resolution Calculator

An Analog-to-Digital Converter (ADC) converts analog voltage to a digital value. The resolution determines how finely the ADC can measure the input signal. Higher resolution means more precise measurements.

📐 ADC Resolution Formulas

Number of Steps: 2^N (N = bits)
Step Size (LSB): Vref / (2^N)
Voltage Resolution: Vref / (2^N)
Digital Value: (Vin / Vref) × (2^N)
Quantization Error: ±0.5 LSB

📊 Common ADC Resolutions

Bits	Steps	LSB (5V Ref)	Common Use
8	256	19.53 mV	Simple sensors, Arduino
10	1,024	4.88 mV	Arduino Uno, Basic
12	4,096	1.22 mV	STM32, Precision
16	65,536	76.29 µV	High-precision
24	16,777,216	0.298 µV	Audio, Medical

❓ Frequently Asked Questions

What is ADC resolution? ▼

ADC resolution is the number of bits used to represent the analog input. Higher resolution = more steps = better accuracy. A 10-bit ADC has 1024 steps (0-1023).

What is LSB in ADC? ▼

LSB (Least Significant Bit) is the smallest voltage change that can be detected. LSB = Vref / 2^N. For a 10-bit ADC with 5V reference, LSB = 4.88mV.

How do I calculate ADC value from voltage? ▼

ADC Value = (Vin / Vref) × 2^N. For example, Vin = 2.5V, Vref = 5V, 10-bit: Value = (2.5/5) × 1024 = 512.

What is quantization error? ▼

Quantization error is the difference between the actual analog voltage and the digital representation. Maximum error is ±0.5 LSB. Higher resolution reduces quantization error.