CS42L52 datasheet(28/82 Pages) CIRRUS

tên linh kiện	CS42L52

Giải thích chi tiết về linh kiện	Low Power, Stereo CODEC w/Headphone & Speaker Amps

PDF	82 Pages

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nhà sản xuất	CIRRUS [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

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)

-80 dB

-64 dB

Figure 9. Noise Gate Attenuation

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