WM8753L
Advanced Information
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
0.414fs
+/- 0.3
UNIT
Voice ADC Filter
Passband
+/- 0.3dB
-14dB
0
0.5fs
Passband Ripple
Stopband
dB
dB
0.53fs
-30
Stopband Attenuation
Group Delay
f > 0.53fs
7/fs
Voice DAC Filter
Passband
+/- 0.3dB
-14dB
0
0.414fs
+/-0.3
0.5fs
Passband Ripple
Stopband
dB
dB
0.53fs
-30
Stopband Attenuation
Group Delay
f > 0.53fs
7/fs
Table 75 Voice Codec Digital Filter Characteristics
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ADC High Pass Filter (HPMODE[1:0] = 00) (256fs, fs=48kHz)
High Pass Filter Corner
Frequency
-3dB
3.7
Hz
-0.5dB
10.4
-0.1dB
21.6
ADC High Pass Filter (HPMODE[1:0] = 01) (256fs, fs=16kHz)
High Pass Filter Corner
Frequency
-3dB
82
Hz
Hz
Hz
-0.5dB
-0.1dB
203
341
ADC High Pass Filter (HPMODE[1:0] = 10) (256fs, fs=8kHz)
High Pass Filter Corner
Frequency
-3dB
82
-0.5dB
-0.1dB
185
272
ADC High Pass Filter (HPMODE[1:0] = 11) (256fs, fs=8kHz)
High Pass Filter Corner
Frequency
-3dB
170
321
415
-0.5dB
-0.1dB
Table 76 ADC Highpass Filter Characteristics
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
AI Rev 3.1 June 2004
w
77
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
