Texas Instruments DRV601EVM, Руководство пользователя

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6.1 THD+N vs Voltage (600-
Ω
Load)
10m 4 20m 50m 100m 200m 500m 1 2
V - Output Voltage - Vrms
O
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N-T
otalHarmonicDistortionPlusNoise-%
4.5 V DVDD
3.3 V DVDD
1.8 V DVDD
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N-T
otalHarmonicDistortionPlusNoise-%
250m 4 500m750m 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75 1
V - Output Voltage - Vrms
O
1.8 V DVDD
3.3 V DVDD
4.5 V DVDD
DRV601EVM Performance
Figure 6. THD+N vs Voltage (600
Ω
)
The THD+N from 10m Vrms to approximately 0.5 Vrms is dominated by noise.
Figure 7. THD+N vs Voltage (600 Ω )
Here the THD+N versus output voltage is shown with linear scale, this makes it easier to see where
clipping occurs. Clipping is often defines as THD+N=1%. For the DRV601 this is 2.25 Vrms with a 3.3-V
supply and 600-
Ω
load.
SLOU215 – January 2008 DRV601EVM 9
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