WM8903 Datasheet, PDF (24/178 Pages) Wolfson Microelectronics plc – Ultra Low Power CODEC for Portable Audio Applications

WM8903
DIGITAL FILTER CHARACTERISTICS
PARAMETER
ADC Filter
Passband
Passband Ripple
Stopband
Stopband Attenuation
DAC Normal Filter
Passband
Passband Ripple
Stopband
Stopband Attenuation
DAC Sloping Stopband Filter
Passband
Passband Ripple
Stopband 1
Stopband 1 Attenuation
Stopband 2
Stopband 2 Attenuation
Stopband 3
Stopband 3 Attenuation
TEST CONDITIONS
+/- 0.05dB
-6dB
f > 0.546 fs
+/- 0.05dB
-6dB
0.454 fs
F > 0.546 fs
+/- 0.03dB
+/- 1dB
-6dB
0.25 fs
f > 0.546 fs
f > 0.7 fs
F > 1.4 fs
MIN
0
0.546s
-60
0
0.546 fs
-50
0
0.25 fs
0.546 fs
-60
0.7 fs
-85
1.4 fs
-55
TYP
0.5fs
0.5 fs
0.5 fs
MAX
0.454 fs
+/- 0.05
0.454 fs
+/- 0.03
0.25 fs
0.454 fs
+/- 0.03
0.7 fs
1.4 fs
Production Data
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
DAC FILTERS
Mode
Group Delay
Normal
16.5 / fs
Sloping Stopband
18 / fs
Mode
Normal
ADC FILTERS
Group Delay
16.5 / 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
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PD, Rev 4.5, June 2012
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