Preliminary Technical Data
WM8766
DIGITAL FILTER CHARACTERISTICS
PARAMETER
TEST CONDITIONS
DAC Filter
MIN
TYP
MAX
0.444fs
±0.05
UNIT
Passband
±0.05 dB
-3dB
0.487fs
Passband ripple
Stopband
dB
0.555fs
-60
Stopband Attenuation
Group Delay
f > 0.555fs
dB
fs
21
Table 11 Digital Filter Characteristics
DAC FILTER RESPONSES
0.2
0.15
0.1
0
-20
-40
0.05
0
-60
-0.05
-0.1
-80
-100
-120
-0.15
-0.2
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 18 DAC Digital Filter Frequency Response
– 44.1, 48 and 96KHz
Figure 19 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 20 DAC Digital Filter Frequency Response
– 192KHz
Figure 21 DAC Digital Filter Ripple – 192kHz
PTD Rev 2.3 February 2004
27
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
