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WM8753LEB/V 数据表(PDF) 31 Page - Wolfson Microelectronics plc

部件名 WM8753LEB/V
功能描述  HI FI AND TELEPHONY DUAL CODEC
PDF  87 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8753LEB/V 数据表(HTML) 31 Page - Wolfson Microelectronics plc

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WM8753L
Advanced Information
w
AI Rev 3.1 June 2004
31
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7:0
LADCVOL
[7:0]
11000011
( 0dB )
Left ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -97dB
0000 0010 = -96.5dB
... 0.5dB steps up to
1111 1111 = +30dB
R16(10h)
Left ADC
Digital Volume
8
LAVU
0
Left ADC Volume Update
0 = Store LADCVOL in intermediate latch
(no gain change)
1 = Update left and right channel gains
(left = LADCVOL, right =
intermediate latch)
7:0
RADCVOL
[7:0]
11000011
( 0dB )
Right ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -97dB
0000 0010 = -96.5dB
... 0.5dB steps up to
1111 1111 = +30dB
R17 (11h)
Right
ADC
Digital Volume
8
RAVU
0
Right ADC Volume Update
0 = Store RADCVOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left = intermediate latch, right =
RADCVOL)
Table 19 ADC Digital Volume Control
AUTOMATIC LEVEL CONTROL (ALC)
The WM8753L has an automatic level control that aims to keep a constant recording volume
irrespective of the input signal level. This is achieved by continuously adjusting the PGA gain so that
the signal level at the ADC input remains constant. A digital peak detector monitors the ADC output
and changes the PGA gain if necessary.
hold
time
decay
time
attack
time
input
signal
signal
after
ALC
PGA
gain
ALC
target
level
Figure 10 ALC Operation



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