參數(shù)資料
型號(hào): CDB42L51
廠商: Cirrus Logic Inc
文件頁數(shù): 26/43頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR CS42L51 CODEC
標(biāo)準(zhǔn)包裝: 1
主要目的: 音頻編解碼器
嵌入式: 是,其它
已用 IC / 零件: CS42L51,CS8406,CS8415
主要屬性: 立體聲數(shù)字音頻發(fā)射器和接收器
次要屬性: 圖形用戶界面,S/PDIF 接口
已供物品: 板,CD
相關(guān)產(chǎn)品: CS42L51-DNZR-ND - IC CODEC STEREO W/HDPN AMP 32QFN
598-1627-ND - IC CODEC STEREO W/HDPN AMP 32QFN
CS42L51-CNZR-ND - IC CODEC LOW-V 24BIT 32-QFP
598-1045-ND - IC CODEC STEREO W/HDPN AMP 32QFN
其它名稱: 598-1005
32
DS679F1
CS42L51
4.3.7
Automatic Level Control (ALC)
When enabled, the ALC monitors the analog input signal after the digital attenuator, detects when peak
levels exceed the maximum threshold settings and lowers, first, the PGA gain settings and then increases
the digital attenuation levels at a programmable attack rate and maintains the resulting level below the
maximum threshold.
When input signal levels fall below the minimum threshold, digital attenuation levels are decreased first
and the PGA gain is then increased at a programmable release rate and maintains the resulting level
above the minimum threshold.
Attack and release rates are affected by the ADC soft ramp/zero cross settings and sample rate, Fs. ALC
soft ramp and zero cross dependency may be independently enabled/disabled.
Recommended settings: Best level control may be realized with the fastest attack and slowest release
setting with soft ramp enabled in the control registers.
Note: 1.) The maximum realized gain must be set
in the PGAx_VOL register. The ALC will only apply the gain set in the PGAx_VOL.
2.) The ALC maintains
the output signal between the MIN and MAX thresholds. As the input signal level changes, the level-con-
trolled output may not always be the same but will always fall within the thresholds.
Software
Controls:
Output
(after ALC)
Input
RRATE[5:0]
PGA Gain and/or
Attenuator
ALC
MAX[2:0]
ARATE[5:0]
below full scale
MIN[2:0]
below full scale
MIN[2:0]
below full scale
MAX[2:0]
below full scale
ADCx_ATT[7:0] and
PGAx_VOL[4:0] volume
controls should NOT be
adjusted manually when
ALCx is enabled.
Figure 11. ALC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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