Production Data
WM8352
28 DIGITAL FILTER CHARACTERISTICS
PARAMETER
ADC Filter
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Passband
+/- 0.025dB
-6dB
0
0.454fs
0.5fs
Passband Ripple
Stopband
+/- 0.025
dB
dB
0.546fs
Stopband Attenuation
Group Delay
f > 0.546fs
-60
21/fs
ADC High Pass Filter
High Pass Filter Corner
Frequency
-3dB
3.7
Hz
-0.5dB
10.4
-0.1dB
21.6
DAC Filter
Passband
+/- 0.035dB
-6dB
0
0.454fs
0.5fs
Passband Ripple
Stopband
+/-0.035
dB
dB
0.546fs
Stopband Attenuation
Group Delay
f > 0.546fs
-55
29/fs
Terminology
1. Stop Band Attenuation (dB) – the degree to which the frequency spectrum is attenuated (outside audio band)
2. Pass-band Ripple – any variation of the frequency response in the pass-band region
28.1 DAC FILTER RESPONSES
10
40m
37m
34m
31m
28m
25m
22m
19m
16m
13m
10m
7m
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
4m
999.99u
-2m
-5m
0
2.205k
4.41k
6.615k
8.82k
11.025k
13.23k
15.435k
17.64k
19.845k
22.05k
0
4.41k
8.82k
13.23k
17.64k
22.05k
26.46k
30.87k
35.28k
39.69k
44.1k
MAGNITUDE(dB)
MA GNITUDE(dB)
Figure 81 DAC Digital Filter Frequency Response (Normal
Mode)
Figure 82 DAC Digital Filter Ripple (Normal Mode)
PD, February 2011, Rev 4.4
323
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
