TIDUFC9 May 2025
THD+N (Total Harmonic Distortion + Noise) is a measurement of how exceptional a sine wave is. The 1kHz sine wave is generated by the audio precision instrument and sent over I2S to the TAC5312-Q1. The audio precision then measures the THD+N of the analog signal across the 4Ω load. Figure 3-3 shows the THD+N versus output power across the load.
THD+N also varies with frequency. Figure 3-4 shows the THD+N across frequency for three different power levels.
| SWEEP | TRACE | COLOR | DATA | AXIS | COMMENT |
|---|---|---|---|---|---|
| 1 | 1 | Black | AnIr.THD+N Ratio | Left | 5W |
| 2 | 1 | Red | AnIr.THD+N Ratio | Left | 10W |
| 3 | 1 | Blue | AnIr.THD+N Ratio | Left | 15W |