Texas Instruments TPA005D12 - Manual (Page 36)

TPA005D12 Class-D EVM Performance Characteristics
3-22 Details
Figures 3–14 and 3–15 show a frequency sweep for a 1-W output. The lower
frequency distortion of the graphs is dominated by noise, while the distortion
at higher frequencies is due primarily to the fast-changing duty cycle of the
PWM output.
Figure 3–14. Class-D Amplifier Distortion versus Frequency at 1 W Into 4
Ω
1
0.02
20 100 1k
THD+N
–
T
otal Harmonic Distortion Plus Noise – (%)
f – Frequency – Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs
FREQUENCY
10k 20k
0.1
VDD = 5 V
RL = 4
Ω
PO = 1 W
TA = 25
°
C
Figure 3–15. Class-D Amplifier Distortion versus Frequency at 1 W Into 8
Ω
1
0.02
20 100 1k
THD+N
–
T
otal Harmonic Distortion Plus Noise – (%)
f – Frequency – Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs
FREQUENCY
10k 20k
0.1
VDD = 5 V
RL = 8
Ω
PO = 1 W
TA = 25
°
C