wm8952 Wolfson Microelectronics plc, wm8952 Datasheet - Page 64

• Manufacturer Part Number: wm8952
• Description: Mono Adc With Microphone Pre-amplifier
• Manufacturer: Wolfson Microelectronics plc

WM8952
Notes
w
DIGITAL FILTER CHARACTERISTICS
Table 48 Digital Filter Characteristics
TERMINOLOGY
1.
2.
3.
Table 49 Total Group Delay
1.
ADC FILTER RESPONSES
Figure 32 ADC Digital Filter Frequency Response
Passband
Passband Ripple
Stopband
Stopband Attenuation
Group Delay
High Pass Filter Corner
Frequency
Total Delay (ADC analogue
input to digital audio interface
output)
ADC Filter
ADC High Pass Filter
-100
-120
Stop Band Attenuation (dB) – the degree to which the frequency spectrum is attenuated (outside audio band)
Pass-band Ripple – any variation of the frequency response in the pass-band region
Note that this delay applies only to the filters and does not include additional delays through other digital circuits. See
Table 49 for the total delay.
Wind noise filter is disabled.
-20
-40
-60
-80
0
0
PARAMETER
PARAMETER
0.5
1
Frequency (Fs)
28/fs
1.5
MIN
TEST CONDITIONS
+/- 0.025dB
f > 0.546fs
-0.5dB
-0.1dB
2
-6dB
-3dB
30/fs
TYP
2.5
32/fs
3
MAX
0.546fs
-60
MIN
0
Figure 33 ADC Digital Filter Ripple
UNIT
-0.05
-0.15
fs
0.15
0.05
-0.1
-0.2
0.2
0.1
0
0
0.5fs
21/fs
10.4
21.6
3.7
TYP
0.1
Frequency (Fs)
+/- 0.025
0.454fs
0.2
MAX
PP, Rev 3.0, December 2008
0.3
UNIT
dB
dB
Hz
Pre Production
0.4
0.5
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