Production Data
WM8772
DIGITAL FILTER CHARACTERISTICS
PARAMETER
TEST CONDITIONS
ADC Filter
MIN
TYP
MAX
0.4535fs
±0.01
UNIT
Passband
±0.01 dB
0
-6dB
0.5fs
Passband ripple
Stopband
dB
dB
0.5465fs
-65
Stopband Attenuation
f > 0.5465fs
DAC Filter
Passband
±0.05 dB
0.444fs
-3dB
0.487fs
Passband ripple
Stopband
±0.05
dB
dB
0.555fs
-60
Stopband Attenuation
f > 0.555fs
Table 1 Digital Filter Characteristics
DAC FILTER RESPONSES
0.2
0
0.15
0.1
-20
-40
0.05
0
-60
-0.05
-0.1
-0.15
-0.2
-80
-100
-120
0
0.5
1
1.5
2
2.5
3
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Frequency (Fs)
Frequency (Fs)
Figure 1 DAC Digital Filter Frequency Response
– 44.1, 48 and 96KHz
Figure 2 DAC Digital Filter Ripple –44.1, 48 and 96kHz
0.2
0
0
-20
-40
-60
-80
-0.2
-0.4
-0.6
-0.8
-1
0
0.2
0.4
0.6
0.8
1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Frequency (Fs)
Frequency (Fs)
Figure 3 DAC Digital Filter Frequency Response
– 192KHz
Figure 4 DAC Digital Filter Ripple – 192kHz
PD Rev 4.2 October 2005
13
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
