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WM8944BECS/R 데이터시트(PDF) 32 Page - Cirrus Logic

부품명 WM8944BECS/R
상세설명  Mono Low-Power CODEC with Video Buffer
PDF  165 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8944BECS/R 데이터시트(HTML) 32 Page - Cirrus Logic

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WM8944B
32
Rev 4.3
Record mode enables the entire set of Signal Enhancement functions in the ADC / Digital Microphone
path. The direct DAC path is also active, without any Signal Enhancement functions; this allows basic
audio playback and digital beep generation.
Playback mode enables the entire set of DSP functions in the DAC path. The direct ADC / Digital
Microphone path is also active, without any DSP functions; this allows basic audio record functions to
the host system.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R64 (40h)
SE Config
Selection
3:0
SE_CONFIG
[3:0]
0000
DSP Configuration Mode select
0000 = Record mode
0001 = Playback mode
0010 = DSP General mode 1
0011 = DSP General mode 2
Table 12 DSP Configuration Mode Select
LOW-PASS / HIGH-PASS FILTER (LPF/HPF)
3D surround
5-notch filter
DF1 filter
L/HPF
Signal Enhancement Block 1 (SE1)
The Low-pass / High-pass filter is part of the SE1 block. This first-order filter can be configured to be
high-pass, low-pass; it can also be bypassed. The cut-off frequency is programmable; the default
setting is bypass (OFF).
The filters are enabled using the SE1_LHPF_L_ENA and SE1_LHPF_R_ENA register bits defined in
Table 13.
The 3D enhancement coefficients are programmed in registers R65 to R67. For the derivation of
these registers, refer to the configuration tools supplied with the WM8944B Evaluation Kit.
Example plots of the Low-pass / High-pass filter response are shown in Figure 12.
1kLPF.res Magnitude(dB)
1kHPF.res Magnitude(dB)
5kLPF.res Magnitude(dB)
5kHPF.res Magnitude(dB)
200LPF.res Magnitude(dB)
200HPF.res Magnitude(dB)
20
39.91
79.62
158.9
317
632.5
1.262k
2.518k
5.024k
10.02k
20k
-27
-24
-21
-18
-15
-12
-9
-6
-3
0
3
Figure 12 Low-pass / High-pass Filter Responses



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