Production Data
WM8737L
DIGITAL FILTER CHARACTERISTICS
The WM8737L has four different types of digital filter characteristics to suit different MCLK and
sample rates (see Master Clock and Audio Sample Rates).
PARAMETER
ADC Filter Type A
Passband
TEST CONDITIONS
MIN
TYP
MAX
UNIT
+/- 0.05dB
-6dB
0
0.4535fs
+/- 0.05
0.5fs
Passband Ripple
Stopband
dB
0.5465fs
-60
Stopband Attenuation
f > 0.5465fs
-3dB
dB
Hz
High Pass Filter Corner
Frequency
3.7
-0.5dB
10.4
21.6
-0.1dB
Table 22 Digital Filter Characteristics
ADC FILTER TYPE
A (256/272)
GROUP DELAY
23/FS
B (256/272, 88.2/96k mode)
C (250 USB)
5/FS
13/FS
D (250 USB, 96k mode)
4/FS
Table 23 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
3. The filter responses are shown on the following page.
PD, Rev 4.4, January 2012
33
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
