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WM8778 データシート(PDF) 34 Page - Wolfson Microelectronics plc

部品番号 WM8778
部品情報  24 BIT 192KHZ STEREO CODEC
PDF  50 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8778 データシート(HTML) 34 Page - Wolfson Microelectronics plc

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WM8778
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PP Rev 1.7 June 2004
34
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
LC Attack (Gain Ramp-down) Time
3:0
ATK[3:0]
0010
ALC mode
0000: 8.4ms
0001: 16.8ms
0010: 33.6ms…
(time doubles with
every step)
1010 or higher:
8.6s
Limiter Mode
0000: 250us
0001: 500us… 0010:
1ms
(time doubles with
every step)
1010 or higher: 256ms
LC Decay (Gain Ramp-up) Time
R18 (12h)
0010010
ALC
Control 3
7:4
DCY [3:0]
0011
ALC mode
0000: 33.5ms
0001: 67.2ms
0010: 134.4ms
….(time doubles for
every step)
1010 or higher:
34.3 ms
Limiter mode
0000: 1.2ms
0001: 2.4ms
0010: 4.8ms ….(time
doubles for every
step)
1010 or higher:
1.2288s
TRANSIENT WINDOW (LIMITER ONLY)
To prevent the limiter responding to to short duration high ampitude signals (such as hand-claps in a
live performance), the limiter has a programmable transient window preventing it responding to
signals above the threshold until their duration exceeds the window period. The Transient window is
set in register TRANWIN.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R20 (14h)
0010100
Limiter Control
6:4
TRANWIN
[2:0]
010
Length of Transient Window:
000: 0us (disabled)
001: 62.5us
010: 125us
…..
111: 4ms
ZERO CROSS
The PGA has a zero cross detector to prevent gain changes introducing noise to the signal. In ALC
mode the register bit ALCZC allows this to be turned off if desired.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R17 (11h)
0010001
ALC Control 2
7
ALCZC
0
(disabled)
PGA Zero Cross Enable:
0 : disabled
1: enabled



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