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WM8941 датащи(PDF) 29 Page - Wolfson Microelectronics plc

номер детали WM8941
подробное описание детали  Mono CODEC with Speaker Driver and Video Buffer
PDF  96 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8941 датащи(HTML) 29 Page - Wolfson Microelectronics plc

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Pre Production
WM8941
w
PP, Rev 3.3, December 2007
29
The notch filter coefficients are calculated as follows:
)
2
/
w
tan(
1
)
2
/
w
tan(
1
a
b
b
0
+
−
=
)
w
cos(
)
a
1
(
a
0
0
1
+
−
=
Where:
s
c
0
f
/
f
2
w
π
=
s
b
b
f
/
f
2
w
π
=
fc = centre frequency in Hz, fb = -3dB bandwidth in Hz, fs = sample frequency in Hz
The actual register values can be determined from the coefficients as follows:
NFn_A0 = -a0 x 2
13
NFn_A1 = -a1 x 2
12
These values are then converted to a 14-bit sign / magnitude notation.
To configure Notch Filter 3 as a 1
st order low pass filter, set the NF3_LP bit to 1 and calculate the
coefficients as follows:
0
a0 =
1
)
2
/
w
tan(
1
)
2
/
w
tan(
a
c
c
1
+
−
=
Where:
s
c
c
f
/
f
2
w
π
=
fc = cut-off frequency in Hz, fs = sample frequency in Hz
The actual register values can be determined from the coefficients as follows:
NF3_A0 = 0
NF3_A1 = -a1 x2
12
These values are then converted to a 14-bit sign / magnitude notation.
DIGITAL ADC VOLUME CONTROL
The output of the ADCs can be digitally attenuated over a range from –127dB to 0dB in 0.5dB steps.
The gain for a given eight-bit code X is given by:
Gain = 0.5 x (x–255) dB for 1
≤ x ≤ 255, MUTE for x = 0
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R15
ADC Digital
Volume
7:0
ADCVOL
[7:0]
11111111
( 0dB )
ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
Table 19 ADC Volume



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