DAC Output Calculator

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Calculate ideal DAC output voltage, LSB size, full-scale range, and code limits from resolution, reference voltage, digital code, gain, and offset.

Input Parameters

DAC Resolution

bits

Reference Voltage

DAC Code

Code must be an integer from 0 to 2^N - 1.

Output Gain

Output Offset

Results

Ideal Output Voltage

LSB Size

Full-scale Output

Code Range

Output Percentage

Design Note

The result is ideal. Real DAC output depends on output buffer headroom, load current, reference tolerance, gain error, offset error, INL, DNL, and settling time.

Equations Used

Maximum code: 2^N - 1

Ideal DAC output: Vout = Offset + Gain × Vref × Code / (2^N - 1)

LSB size: LSB = Gain × Vref / (2^N - 1)

Frequently Asked Questions (FAQ)

Q1: What does a DAC output calculator do?
It converts a DAC digital code into the ideal analog output voltage.

Q2: What is DAC LSB size?
LSB is the ideal voltage change caused by one digital code step.

Q3: Why is my real DAC output different from the calculation?
Reference error, offset, gain error, output load, op amp headroom, and nonlinearity can shift the real output.

Q4: Can the DAC output reach exactly Vref?
Many unipolar DACs map maximum code close to full-scale, but output buffer limitations may prevent rail-to-rail output.

Q5: Should DAC code be decimal or hexadecimal?
This tool uses decimal code; convert hexadecimal code to decimal before entering it.

Disclaimer: This calculator provides ideal DAC transfer values. Check the device datasheet for code mapping, output range, load limits, settling time, and error specifications.

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