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6.2 THD+N vs Voltage (Digital Input)
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
3m 45m 10m 20m 50m 100m 200m 500m 1 2
THD+N-T
otalHarmonicDistortion+Noise-%
600 W
100kW
Voltage-V
Input=1kHz
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
200m 2400m 600m 800m 1 1.2 1.4 1.6 1.8
THD+N-TotalHarmonicDistortion+Noise-%
Voltage-V
600 W
100kW
Input=1kHz
DRV601EVM2 Performance
Figure 8. THD+N vs Voltage (Digital Input)
The THD+N in the range from 10 mV
rms
to 1 V
rms
is completely dominated by noise. The THD+N is
independent of the load impedances and is set by the PCM1772 DAC.
Figure 9. THD+N vs Voltage (Digital Input) Linear Scale
Here the THD+N versus output voltage is shown with linear scale. This makes it easier to see where
clipping occurs. Clipping is often defined as THD+N = 1%.
SLOU217 – March 2008 DRV601EVM2 11
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