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WM8987LGECO/V Datasheet(PDF) 47 Page - Wolfson Microelectronics plc

Part # WM8987LGECO/V
Description  Stereo CODEC for Portable Audio Applications
PDF  58 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8987LGECO/V Datasheet(HTML) 47 Page - Wolfson Microelectronics plc

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Pre-Production
WM8987L
w
PP Rev 3.0 January 2007
47
DIGITAL FILTER CHARACTERISTICS
The ADC and DAC employ different digital filters. There are 4 types of digital filter, called Type 0, 1, 2
and 3. The performance of Types 0 and 1 is listed in the table below, the responses of all filters is
shown in the proceeding pages.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ADC Filter Type 0 (USB Mode, 250fs operation)
+/- 0.05dB
0
0.416fs
Passband
-6dB
0.5fs
Passband Ripple
+/- 0.05
dB
Stopband
0.584fs
Stopband Attenuation
f > 0.584fs
-60
dB
ADC Filter Type 1 (USB mode, 272fs or Normal mode operation)
+/- 0.05dB
0
0.4535fs
Passband
-6dB
0.5fs
Passband Ripple
+/- 0.05
dB
Stopband
0.5465fs
Stopband Attenuation
f > 0.5465fs
-60
dB
-3dB
3.7
-0.5dB
10.4
High Pass Filter Corner
Frequency
-0.1dB
21.6
Hz
DAC Filter Type 0 (USB mode, 250fs operation)
+/- 0.03dB
0
0.416fs
Passband
-6dB
0.5fs
Passband Ripple
+/-0.03
dB
Stopband
0.584fs
Stopband Attenuation
f > 0.584fs
-50
dB
DAC Filter Type 1 (USB mode, 272fs or Normal mode operation)
+/- 0.03dB
0
0.4535fs
Passband
-6dB
0.5fs
Passband Ripple
+/- 0.03
dB
Stopband
0.5465fs
Stopband Attenuation
f > 0.5465fs
-50
dB
Table 44 Digital Filter Characteristics
DAC FILTERS
ADC FILTERS
Mode
Group Delay
Mode
Group Delay
0 (250 USB)
11/FS
0 (250 USB)
13/FS
1 (256/272)
16/FS
1 (256/272)
23/FS
2 (250 USB, 96k mode)
4/FS
2 (250 USB, 96k mode)
4/FS
3 (256/272, 88.2/96k mode)
3/FS
3 (256/272, 88.2/96k mode)
5/FS
Table 45 ADC/DAC Digital Filters Group Delay
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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