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WM8978CGEFL/V датащи(PDF) 34 Page - Wolfson Microelectronics plc

номер детали WM8978CGEFL/V
подробное описание детали  Stereo CODEC with Speaker Driver
PDF  118 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978CGEFL/V датащи(HTML) 34 Page - Wolfson Microelectronics plc

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WM8978
Production Data
w
PD, Rev 4.5, October 2011
34
NOTCH FILTER WORKED EXAMPLE
The following example illustrates how to calculate the a0 and a1 coefficients for a desired centre
frequency and -3dB bandwidth.
Fc = 1000 Hz
fb = 100 Hz
fs = 48000 Hz
s
c
f
f
w
/
2
0
=
2
x (1000 / 48000) = 0.1308996939 rads
s
b
b
f
f
w
/
2
=
2
x (100 / 48000) = 0.01308996939 rads
)
2
/
tan(
1
)
2
/
tan(
1
0
b
b
w
w
a
=
)
2
/
9
0130899693
.
0
tan(
1
)
2
/
9
0130899693
.
0
tan(
1
= 0.9869949627
)
cos(
)
1
(
0
0
1
w
a
a
=
)
1308996939
.
0
cos(
)
9869949627
.
0
1
(
= -
1.969995945
NFA0 = -a0 x 213 = -8085 (rounded to nearest whole number)
NFA1 = -a1 x 212 = 8069 (rounded to nearest whole number)
These values are then converted to a 2’s complement notation:
NfnA0[12:0] = 13’h1F95; Converting to 2’s complement NFA0 = 14’h4000 – 14’h1F95 = 14’h206B
NfnA1[12:0] = 13’h1F85; Converting to 2’s complement NFA0 = 14’h1F85
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:
0.5
 (G-255) dB for 1  G  255;
MUTE for G = 0



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