WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 149

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

w
Pre-Production
DAC FILTER RESPONSES
Figure 87 DAC Digital Filter Frequency Response (Normal
Mode)
Figure 89 DAC Digital Filter Frequency Response (Sloping
Stopband Mode)
-110
-130
-150
-110
-130
-150
-10
-30
-50
-70
-90
-10
-30
-50
-70
-90
10
10
0
0
0.5
0.5
1
1
MAGNITUDE(dB)
MAGNITUDE(dB)
Frequency (fs)
Frequency (fs)
DAC STOPBAND ATTENUATION
The DAC digital filter type is selected by the DAC_SB_FILT register bit as shown in Table 82.
Table 82 DAC Filter Selection
R10 (0Ah)
1.5
1.5
REGISTER
ADDRESS
2
2
2.5
2.5
BIT
8
DAC_SB_FI
LT
3
3
LABEL
Figure 88 DAC Digital Filter Ripple (Normal Mode)
Figure 90 DAC Digital Filter Ripple (Sloping Stopband
Mode)
-0.005
-0.05
-0.15
-0.25
-0.35
-0.45
0.035
0.025
0.015
0.005
0.05
-0.1
-0.2
-0.3
-0.4
-0.5
0.04
0.03
0.02
0.01
0
0
0
0
0b
DEFAULT
0.05
0.05
0.1
0.1
0.15
0.15
Selects DAC filter characteristics
0 = Normal mode
1 = Sloping stopband mode
MAGNITUDE(dB)
MAGNITUDE(dB)
0.2
0.2
Frequency (fs)
Frequency (fs)
0.25
0.25
DESCRIPTION
0.3
0.3
PP, May 2008, Rev 3.1
0.35
0.35
0.4
0.4
WM8959
0.45
0.45
0.5
0.5
149