Advanced Information
WM8753L
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
0.416fs
+/- 0.05
UNIT
ADC Filter Type 0 (USB Mode, 250fs operation)
Passband
+/- 0.05dB
-6dB
0
0.5fs
Passband Ripple
Stopband
dB
dB
0.584fs
-60
Stopband Attenuation
Group Delay
f > 0.584fs
17/fs
0.5fs
ADC Filter Type 1 (USB mode, 272fs or Normal mode operation)
Passband
+/- 0.05dB
-6dB
0
0.4535fs
+/- 0.05
Passband Ripple
Stopband
dB
dB
0.5465fs
-60
Stopband Attenuation
Group Delay
f > 0.5465fs
25/fs
ADC High Pass Filter
High Pass Filter Corner
Frequency
-3dB
3.7
Hz
-0.5dB
10.4
-0.1dB
21.6
DAC Filter Type 0 (USB mode, 250fs operation)
Passband
+/- 0.03dB
-6dB
0
0.416fs
+/-0.03
0.5fs
Passband Ripple
Stopband
dB
dB
0.584fs
-50
Stopband Attenuation
Group Delay
f > 0.584fs
15/fs
0.5fs
DAC Filter Type 1 (USB mode, 272fs or Normal mode operation)
Passband
+/- 0.03dB
-6dB
0
0.4535fs
+/- 0.03
Passband Ripple
Stopband
dB
dB
0.5465fs
-50
Stopband Attenuation
Group Delay
f > 0.5465fs
18/fs
Table 74 HiFi Digital Filter Characteristics
AI Rev 3.1 June 2004
76
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
