Cirrus Logic CS4339 - Manual (Page 20)

20
CS4334/5/8/9
4.10 Base Rate Mode Performance Plots
-140
+0
-130
-120
-110
-100
-90
-80
-70
-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
-130
-120
-110
-100
-90
-80
-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
-140
+ 0
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
2k 20k 4k 6k 8k 10k 12k 14k 16k 18k
Hz 20k
2k 4k 6k 8k 10k 12k 14k 16k 18k
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
dBr
A
Hz
20k 2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
dBr A
(16k FFT of a 1 kHz input signal)
Figure 23. 0 dBFS FFT (BRM)
(16k FFT of a 1 kHz input signal)
Figure 24. -60 dBFS FFT (BRM)
-140
+ 0
-130
-120
-110
-100
-90
-80
-70
-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
-130
-120
-110
-100
-90
-80
-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
dB
r A
2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
-1 40
+ 0
-1 30
-1 20
-1 10
-1 00
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
2k 20k 4 k 6k 8k 10k 12 k 1 4k 16k 18 k
H z
2k 4k 6k 8k 10k 12k 14k 16k 18k
-140
-130
-120
-110
-100
-90
-80
-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
dB
r A
2k 6k 4k 8k 10k 12k 14k 16k 18k 20k
Hz
(16k FFT with no input signal)
Figure 25. Idle Channel Noise FFT (BRM)
(16k FFT of intermodulation distortion using 13 kHz and 14 kHz input signals)
Figure 26. Twin Tone IMD FFT (BRM)
-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
-100
-90
-80
-70
-60
dB
r A
-110
+0
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
20 20k 50 100 200 500 1k 2k 5k 10k
Hz
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
d B
r
A
20 50 100 200 500 1k 2k 5k 10k 20k
Hz
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
dB
r A
100 50 200 500 1k 2k 5k 10k
Hz
20 20k
(THD+N plots measured using a 1kHz 24-bit dithered input signal)
Figure 27. THD+N vs. Amplitude (BRM)
(THD+N plots measured using a 1kHz 24-bit dithered input signal)
Figure 28. THD+N vs. Frequency (BRM)
All measurements were taken from the CDB4334 evaluation board using the Audio Precision Dual Domain
System Two Cascade.