TAS2521
www.ti.com
SLAS687A –FEBRUARY 2013–REVISED FEBRUARY 2013
4 Typical Performance
4.1 Class D Speaker Driver Performance
20
0
20
0
œ20
œ20
œ40
œ40
œ60
œ60
œ80
œ80
œ100
œ120
œ140
œ160
œ180
œ100
œ120
œ140
œ160
œ180
0
4000
8000
12000
16000
20000
0
4000
8000
12000
16000
20000
C001
C002
Frequency (Hz)
Frequency (Hz)
Figure 4-1. DAC To Speaker Amplitude at 0 dBFS vs Frequency (4
Figure 4-2. AINL To Speaker FFT Amplitude at 0 dBFS vs
Ω Load)
Frequency (4 Ω Load)
100
100.00
10.00
1.00
Gain = 6 dB
Gain = 12 dB
Gain = 18 dB
10
1
Gain = 24 dB
SPKVDD=2.7V
Series1
SPKVDD=3V
Series2
SPKVDD=3.3V
Series4
0.1
0.01
0.10
0.01
SPKVDD=3.6V
Series5
SPKVDD=4.2V
Series6
SPKVDD=5.5V
Series7
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
C003
C004
Output Power (W)
Output Power (W)
Figure 4-3. Total Harmonic Distortion + Noise vs 4 Ω Speaker
Figure 4-4. Total Harmonic Distortion + Noise + NOISE vs 4 Ω
Power (SPKVDD = 5.5 V)
Speaker Power (Gain = 18 dB)
100.00
100
10
1
Gain = 6 dB
Series1
Gain = 12 dB
Series2
Gain = 18 dB
Series4
10.00
Gain = 24 dB
Series5
1.00
0.10
0.01
SPKVDD = 2.7 V
Series1
SPKVDD = 3 V
Series2
SPKSVDeDri=e3s.43 V
SPKSVDeDri=e3s.56 V
SPKSVDeDri=e4s.62 V
SPKSVDeDri=e5s.75 V
0.1
0.01
0
0.5
1
1.5
2
2.5
0
0.5
1
1.5
2
2.5
C005
C006
Output Power (W)
Output Power (W)
Figure 4-5. Total Harmonic Distortion + Noise + NOISE vs 8 Ω
Figure 4-6. Total Harmonic Distortion + Noise + NOISE vs 8 Ω
Speaker Power (SPKVDD = 5.5 V)
Speaker Power (Gain = 18 dB)
Copyright © 2013, Texas Instruments Incorporated
Typical Performance
15
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