Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Clock Hertz (Hz)

Required number input.

Tuning Word

Required integer input.

Accumulator Bits (bits)

Required integer input.

DDS output frequency from an integer tuning word, system clock and phase accumulator bit width. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Output Hertz (Hz)

The resulting output hertz returned as a number.

• Oscillator estimates use nominal component values and simplified resonator models. Load capacitance, parasitics, drive level, startup margin, phase noise, temperature, aging, pulling, and amplifier nonlinearities determine the realized frequency and stability.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

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  Numerically controlled oscillator frequency step for a given clock and phase accumulator width.

• PLL Output Frequency

  Compute the output frequency of a phase-locked loop from the reference frequency and divider ratios.

• SPI Frequency from Trace Delay

  Estimate a conservative SPI clock ceiling from trace length, propagation delay per metre, and available timing fraction of a cycle. This only budgets propagation delay; include device clock-to-output, setup, skew, and return path in a real design.