Model current output DAC behavior with practical inputs. Convert code steps into current and voltage. Review results, export data, and verify analog design assumptions.
Example setup: 12-bit DAC, 20 mA full-scale current, 250 Ω load, zero offset, zero gain trim, positive polarity.
| Code | Output Current (mA) | Output Voltage (V) |
|---|---|---|
| 0 | 0 | 0 |
| 1024 | 5.0012 | 1.2503 |
| 2048 | 10.0024 | 2.5006 |
| 3072 | 15.0037 | 3.7509 |
| 4095 | 20 | 5 |
Maximum Code = 2N - 1
LSB Current = IFS / (2N - 1)
Ideal Output Current = IOFFSET + (Code × LSB Current)
Adjusted Output Current = Ideal Output Current × (1 + Gain Trim / 100)
Output Voltage = (Adjusted Output Current × Load Resistance) + Voltage Offset
This model helps convert DAC current output into expected voltage across a load resistor.
A current output DAC converts a digital code into analog current. Engineers often turn that current into voltage with a resistor. This calculator helps you estimate both values quickly. It is useful during circuit planning, verification, and design review.
Many precision converters do not drive voltage directly. They deliver a scaled output current instead. The final voltage depends on the load resistance and any offsets in the signal path. That means voltage prediction must include more than the digital code alone.
This engineering calculator starts with resolution and code. It then finds the maximum code and LSB current size. After that, it estimates ideal output current. It can also include zero-scale offset current, gain trim, polarity choice, and a manual voltage offset. The tool finally converts the adjusted current into output voltage across the chosen load resistor.
A larger resistor produces more voltage from the same current. A smaller resistor produces less voltage but may improve compliance margin. This relationship is simple, but it is easy to overlook during fast design work. A quick calculator reduces mistakes before simulation and hardware testing.
The compliance limit check is important. A current output DAC can only operate correctly within a valid output voltage range. If the computed voltage exceeds that range, the analog stage may not behave as expected. This page highlights that risk immediately.
This tool fits mixed-signal design, instrumentation, control systems, signal conditioning, and lab evaluation work. It is helpful for resistor selection, full-scale planning, code step analysis, and error budgeting. The example table also makes quick comparisons easier when you review several code values.
Use the calculator when you need a fast estimate. Then confirm the result with device data, simulation, and bench measurement for final validation.
It estimates DAC output current and the resulting voltage across a load resistor. It also shows LSB current, full-scale voltage, load power, and a basic compliance review.
A current output DAC becomes a voltage source only after current flows through a resistor or similar load. Without resistance, you cannot estimate the output voltage correctly.
Full-scale current is the DAC output current at the highest code under the chosen model. It sets the current range and determines the LSB step size.
Gain trim scales the ideal output current. Positive trim increases current and voltage. Negative trim reduces both values. It is useful when you model calibrated or imperfect output stages.
Some practical circuits do not start at exactly zero current. Offset current lets you model that behavior and see how it shifts both the output current and voltage.
Compliance voltage is the output range where the DAC current source still behaves properly. If predicted voltage exceeds that range, the current may no longer follow the ideal equation.
Yes. Use the polarity option to flip the sign of the calculated current and voltage. This is helpful for inverting stages or negative output arrangements.
Yes. The CSV file is useful for spreadsheets and logs. The PDF file is useful for quick documentation, review notes, and lightweight design records.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.