Figure 20. fft - digital in to hp out @ -60 dbfs, Figure 21. fft - digital in to hp out - no input, Cdb42l56 – Cirrus Logic CDB42L56 User Manual
Page 23: Master volume (digital) headphone volume (analog), Figure 21, Figure 20. thd+n vs. volume - digital in to hp out, Fft - digital in to hp out @ 0 dbfs
DS851DB1
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CDB42L56
-110
-70
-108
-106
-104
-102
-100
-98
-96
-94
-92
-90
-88
-86
-84
-82
-80
-78
-76
-74
-72
d
B
r
A
-60
+0
-50
-40
-30
-20
-10
dBr A
Master Volume
(Digital)
Headphone Volume
(Analog)
-140
+0
-130
-120
-110
-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
Figure 20. THD+N vs. Volume - Digital In to HP Out
Figure 21.
FFT - Digital In to HP Out @ 0 dBFS
-140
+0
-130
-120
-110
-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
-140
+0
-130
-120
-110
-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
Figure 20. FFT - Digital In to HP Out @ -60 dBFS
Figure 21. FFT - Digital In to HP Out - No Input
-140
+0
-130
-120
-110
-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
-140
+0
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
20k
120k
40k
60k
80k
100k
Hz
Figure 22. FFT - Digital In to HP Out - No Input Wideband
Figure 23. FFT Crosstalk - Digital In to HP Out @ 0 dBFS