User Manual

TPA005D02 Class D EVM Measured Characteristics
3-32
Details
THD+N versus frequency is shown in Figure 3–24, and correlates with the data
shown in Figure 3–23. The rise in distortion at higher frequencies is due
primarily to the increase in crosstalk with frequency (Figure 3–25). The
crosstalk was measured at full output power, which is the worst-case scenario.
Crosstalk may be reduced by using shielded inductors in the output filter.
Figure 3–24. Distortion versus Frequency
10
0.1
20 100 1k
THD+N – Total Harmonic Distortion Plus Noise – (%)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs
FREQUENCY
10k 20k
5
2
0.5
0.2
1
V
DD
= 5 V
R
L
= 4Ω
1 W
1/2 W
Figure 3–25. Crosstalk versus Frequency
20 100 1k
Crosstalk – dB
f – Frequency – Hz
CROSSTALK
vs
FREQUENCY
10k 20k
V
DD
= 5 V
R
L
= 4Ω
P
O
= 2 W
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
L to R
R to L