參數(shù)資料
型號: CS42L52-DNZR
廠商: CIRRUS LOGIC INC
元件分類: 消費(fèi)家電
中文描述: SPECIALTY CONSUMER CIRCUIT, QCC40
封裝: 6 X 6 MM, LEAD FREE, MO-220, QFN-40
文件頁數(shù): 21/59頁
文件大?。?/td> 1800K
代理商: CS42L52-DNZR
28
DS680F1
CS42L52
5/13/08
changes, the level-controlled output may not always be the same but will always fall within the
thresholds.
4.2.3
Noise Gate
The noise gate may be used to mute signal levels that fall below a programmable threshold. This prevents
the ALC from applying gain to noise. A programmable delay may be used to set the minimum time before
the noise gate attacks the signal.
Note:
Maximum noise gate attenuation levels will depend on the gain applied in either the PGA or MIC
pre-amplifier. For example: If both +32 dB pre-amplification and +12 dB programmable gain is applied,
the maximum attenuation that the noise gate achieves will be 52 dB (-96 + 32 + 12) below full-scale.
Referenced Control Register Location
PGAxVOL[5:0
MAX[2:0], MIN[2:0]
Referenced Control
Register Location
Ou tp u t
(a fte r A L C )
Inpu t (b e fo re A L C )
RRAT E [5 :0 ]
P G A G a in a nd/or
A tte n uator
AL C
Re s p o n s e
MA X [2 :0 ]
ARA T E [5 :0
]
b e lo w fu ll s c a le
MIN [2 :0 ]
belo w fu ll s c ale
M IN [2:0]
b e lo w fu ll s c a le
MA X [2 :0 ]
b e lo w fu ll s c a le
Figure 8. ALC
-96
-40
THRESH[2:0]
Ma
xi
mu
m
At
te
nu
a
ti
o
n*
-52 dB
Output
(dB)
Input (dB)
N
G
E
N
=1
N
G
E
N
=0
-80 dB
-64 dB
Figure 9. Noise Gate Attenuation
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