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WM8985GEFL/R датащи(PDF) 42 Page - Wolfson Microelectronics plc

номер детали WM8985GEFL/R
подробное описание детали  Multimedia CODEC with Class D Headphone and Line Out
PDF  121 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8985GEFL/R датащи(HTML) 42 Page - Wolfson Microelectronics plc

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WM8985
Production Data
w
PD, Rev 4.6, July 2009
42
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
0
f
/
f
2
w
π
=
=
π
2 x (1000 / 48000) = 0.1308996939 rads
s
b
b
f
/
f
2
w
π
=
=
π
2
x (100 / 48000) = 0.01308996939 rads
)
2
/
w
tan(
1
)
2
/
w
tan(
1
a
b
b
0
+
−
=
=
)
2
/
9
0130899693
.
0
tan(
1
)
2
/
9
0130899693
.
0
tan(
1
+
−
= 0.9869949627
)
w
cos(
)
a
1
(
a
0
0
1
+
−
=
=
)
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 2’s complement:
NFA0 = 14’h206B = 14’b10000001101011
NFA1 = 14’h1F85 = 14’b 01111110000101
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
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R15 (0Fh)
Left channel
ADC Digital
Volume
7:0
ADCLVOL
[7:0]
11111111
( 0dB )
Left ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
… 0.5dB steps up to
1111 1111 = 0dB
8
ADCVU
Not
latched
ADC left and ADC right volume do not
update until a 1 is written to ADCVU (in
reg 15 or 16)
R16 (10h)
Right channel
ADC Digital
Volume
7:0
ADCRVOL
[7:0]
11111111
( 0dB )
Right ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
8
ADCVU
Not
latched
ADC left and ADC right volume do not
update until a 1 is written to ADCVU (in
reg 15 or 16)
Table 18 ADC Digital Volume Control



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