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CS42L52 Datasheet(PDF) 28 Page - Cirrus Logic

Part # CS42L52
Description  Low Power, Stereo CODEC w/Headphone & Speaker Amps
PDF  82 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS42L52 Datasheet(HTML) 28 Page - Cirrus Logic

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DS680A1
CS42L52
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
Noise Gate Controls............ “Noise Gate Control (Address 2Dh)” on page 69
Ou tpu t
(a fter A L C )
In pu t
RR AT E [5 :0]
P G A G ain a nd/or
A ttenuator
AL C
MA X [2 :0]
AR AT E[5 :0
]
be low fu ll scale
M IN [2:0]
below full scale
MIN [2:0 ]
b elow full sca le
M A X [2:0]
below full scale
Figure 8. ALC
-96
-40
THRESH[2:0]
-52 dB
Output
(dB)
Input (dB)
NG
EN
=1
NG
EN
=0
-80 dB
-64 dB
Figure 9. Noise Gate Attenuation



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