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WM8980CGEFL/V Datasheet(PDF) 34 Page - Wolfson Microelectronics plc

Part # WM8980CGEFL/V
Description  Stereo CODEC with Speaker Driver and Video Buffer
PDF  123 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8980CGEFL/V Datasheet(HTML) 34 Page - Wolfson Microelectronics plc

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WM8980
Pre-Production
w
PP, Rev 3.8, May 2012
34
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
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R15
Left channel
ADC Digital
Volume
7:0
ADCVOLL
[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
Right channel
ADC Digital
Volume
7:0
ADCVOLR
[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 17 ADC Digital Volume Control



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