WM8991 Datasheet, PDF (167/174 Pages) Wolfson Microelectronics plc – Mobile Multimedia CODEC with Dual-Mode Class AB/D Speaker Driver

Pre-Production
ADC FILTER RESPONSES
20
0
-20
-40
-60
-80
-100
-120
-140
0.00
0.25
0.50
0.75
Frequency (fs)
Figure 90 ADC Digital Filter Frequency Response
WM8991
0.1
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
0.00
0.25
Frequency (fs)
Figure 91 ADC Digital Filter Ripple
ADC HIGH PASS FILTER RESPONSES
2.1246m
-1.1717
-2.3455
-3.5193
-4.6931
-5.8669
-7.0407
-8.2145
-9.3883
-10.562
-11.736
1
MA GNITUDE( dB)
2.6923
7.2484
19.515
52.54
141.45
380.83
1.0253k
2.7605k
7.432k
20.009k
Figure 92 ADC Digital High Pass Filter Frequency
Response (48kHz, Hi-Fi Mode, ADC_HPF_CUT[1:0]=00)
-2.3338m
-8.3373
-16.672
-25.007
-33.342
-41.677
-50.012
-58.347
-66.682
-75.017
-83.352
2
5.0248
12.624
hpf_response.res MAGNITUDE(dB)
hpf_response2.res#1 MAGNITUDE(dB)
31.716
79.683
200.19
502.96
1.2636k
hpf_response2.res MAGNITUDE(dB)
3.1747k
7.9761k
20.039k
Figure 93 ADC Digital High Pass Filter Ripple (48kHz,
Voice Mode, ADC_HPF_CUT=01, 10 and 11)
w
PP, May 2008, Rev 3.1
167