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WM8993 датащи(PDF) 56 Page - Wolfson Microelectronics plc

номер детали WM8993
подробное описание детали  Audio Hub CODEC for Multimedia Phones
PDF  229 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8993 датащи(HTML) 56 Page - Wolfson Microelectronics plc

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WM8993
Production Data
w
PD, November 2010, Rev 4.0
56
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R123 (7Bh)
DRC Control 1
10
DRC_QR_ENA
1
Quick release enable
0 = disabled
1 = enabled
R125 (7Dh)
DRC Control 3
3:2
DRC_THRESH_
QR [1:0]
01
Quick release crest factor threshold
00 = 12dB
01 = 18dB (default)
10 = 24dB
11 = 30dB
1:0
DRC_RATE_QR
[1:0]
00
Quick release decay rate
(seconds/6dB)
00 = 0.725ms (default)
01 = 1.45ms
10 = 5.8ms
11 = Reserved
Table 24 DRC Quick-Release Control
GAIN SMOOTHING
The DRC includes a gain smoothing filter in order to prevent gain ripples. A programmable level of
hysteresis is also used to control the DRC gain. This improves the handling of very low frequency
input signals whose period is close to the DRC attack/decay time. DRC Gain Smoothing is enabled
by default and it is recommended to use the default register settings.
The extent of the gain smoothing filter may be adjusted or disabled using the control fields described
in Table 25.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R123 (7Bh)
DRC Control 1
11
DRC_SMOOTH
_ENA
1
Gain smoothing enable
0 = disabled
1 = enabled
8
DRC_HYST_EN
A
1
Gain smoothing hysteresis enable
0 = disabled
1 = enabled
5:4
DRC_THRESH_
HYST [1:0]
01
Gain smoothing hysteresis
threshold
00 = Low
01 = Medium (recommended)
10 = High
11 = Reserved
Table 25 DRC Gain Smoothing



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