Cirrus Logic CS4339 - Manual (Page 21)

21
CS4334/5/8/9
4.11 High Rate Mode Performance Plots
-140
+ 0
-130
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-50
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-10
d
B
r
A
2k 20k 4k 6k 8k 10k 12k 14k 16k 18k
Hz
2k 4k 6k 8k 10k 12k 14k 16k 18k
-140
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-100
-90
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-50
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+0
dB
r A
Hz
20k
+0
-10
-20
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-50
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-90
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dB
r A
2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
-140
+ 0
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
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-20
-10
d
B
r
A
2k 20k 4k 6k 8k 10k 12k 14k 16k 18k
Hz
2k 4k 6k 8k 10k 12k 14k 16k 18k
-140
-130
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-110
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-90
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-50
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+0
dBr A
Hz
20k
+0
-10
-20
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dB
r A
2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
(16k FFT of a 1 kHz input signal)
Figure 29. 0 dBFS FFT (HRM)
(16k FFT of a 1 kHz input signal)
Figure 30. -60 dBFS FFT (HRM)
-140
+0
-130
-120
-110
-100
-90
-80
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-50
-40
-30
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-10
d
B
r
A
2k 20k 4k 6k 8k 10k 12k 14k 16k 18k
Hz
2k 4k 6k 8k 10k 12k 14k 16k 18k
-140
-130
-120
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-100
-90
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-70
-60
-50
-40
-30
-20
-10
+0
dB
r A
Hz
20k
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
dBr A
2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
A ud io P re c is io n 0 8 /0 5 /9 9 1 1 :1 1 :3 6 D -A C C IF IMD vs A MP L IT UD E
-140
+ 0
-130
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-110
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-90
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-60
-50
-40
-30
-20
-10
d
B
r
A
2k 20k 4k 6k 8k 10k 12k 14k 16k 18k
Hz
2k 4k 6k 8k 10k 12k 14k 16k 18k
-140
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-100
-90
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-50
-40
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-20
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+0
dB
r A
Hz
20k
+0
-10
-20
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-50
-60
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-80
-90
-100
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dB
r A
2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
(16k FFT with no input signal)
Figure 31. Idle Channel Noise FFT (HRM)
(16k FFT of intermodulation distortion using 13 kHz and 14 kHz input signals)
Figure 32. Twin Tone IMD FFT (HRM)
-110
-60
-100
-90
-80
-70
d
B
r
A
-60 +0 -50 -40 -30 -20 -10
dBFS
-50 -40 -30 -20 -10
dBFS
-60 +0
-110
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-90
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-70
-60
dB
r A
-110
+0
-100
-90
-80
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-50
-40
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-20
-10
d
B
r
A
20 20k 50 100 200 500 1k 2k 5k 10k
Hz
-110
-100
-90
-80
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-60
-50
-40
-30
-20
-10
+0
d
B
r
A
20 50 100 200 500 1k 2k 5k 10k 20k
Hz
100 50 200 500 1k 2k 5k 10k
Hz
20 20k
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
dB
r A
(THD+N plots measured using a 1kHz 24-bit dithered input signal)
Figure 33. THD+N vs. Amplitude (HRM)
(THD+N plots measured using a 1kHz 24-bit dithered input signal)
Figure 34. THD+N vs. Frequency (HRM)
All measurements were taken from the CDB4334 evaluation board using the Audio Precision Dual Domain
System Two Cascade.