Pre-Production
WM8985
DIGITAL FILTER CHARACTERISTICS
PARAMETER
ADC Filter
TEST CONDITIONS
MIN
TYP
MAX
0.454fs
+/- 0.025
UNIT
Passband
+/- 0.025dB
-6dB
0
0.5fs
Passband Ripple
Stopband
dB
dB
0.546fs
-60
Stopband Attenuation
Group Delay
f > 0.546fs
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
-55
Stopband Attenuation
Group Delay
f > 0.546fs
29/fs
Table 54 Digital Filter Characteristics
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
PP, Rev 3.4, October 2006
109
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