WM8781GEDS View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8781GEDS' PDF : 21 Pages View PDF
WM8781
DIGITAL FILTER CHARACTERISTICS
The WM8781 digital filter characteristics scale with sample rate.
Production Data
PARAMETER
TEST CONDITIONS
ADC Sample Rate (Single Rate – 48Hz typically)
Passband
+/- 0.01dB
-6dB
Passband Ripple
Stopband
Stopband Attenuation
f > 0.5465fs
Group Delay
ADC Sample Rate (Dual Rate – 96kHz typically)
Passband
+/- 0.01dB
-6dB
Passband Ripple
Stopband
Stopband Attenuation
f > 0.5465fs
Group Delay
Table 8 Digital Filter Characteristics
MIN
TYP
MAX
UNIT
0
0.4535fs
0.4892fs
+/- 0.01
dB
0.5465fs
-65
dB
22
fs
0
0.4535fs
0.4892fs
+/- 0.01
dB
0.5465fs
-65
dB
22
fs
ADC FILTER RESPONSES
0
-20
-40
-60
-80
0
0.5
1
1.5
2
2.5
Frequency (Fs)
Figure 12 Digital Filter Frequency Response
0.02
0.015
0.01
0.005
0
-0.005
-0.01
-0.015
-0.02
3
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Frequency (Fs)
Figure 13 ADC Digital Filter Ripple
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PD, January 2012, Rev 4.5
16
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