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參數(shù)資料
| 型號： | CDB4222 |
| 廠商： | Cirrus Logic, Inc. |
| 元件分類： | Codec |
| 英文描述： | 20-Bit Stereo Audio Codec with Volume Control |
| 中文描述： | 20帶有音量位立體聲音頻編解碼器控制 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 580K |
| 代理商： | CDB4222 |
Analog/Digital Volume Control - Control Port
Mode Only
The DAC outputs are each routed through an at-
tenuator which is adjustable in 0.5 dB steps.
Output attenuation is available through the Out-
put Attenuator Data Bytes (#3 & #4). Level
changes are implemented with an analog volume
control until the residual output noise is equal to
the noise floor in the mute state at which point
volume changes are performed digitally. This
technique is superior to purely digital volume
control techniques as the noise is attenuated by
the same amount as the signal, thus preserving
dynamic range (see Figure 5).
The CS4222 implements a "soft" volume control
whereby level changes are achieved by ramping
from the current level to the new level in 0.5 dB
steps. The default rate of volume change is 8
LRCK cycles for each 0.5 dB step (equivalent to
647
μ
s at Fs = 48 kHz). The rate of volume
Figure 4.
Signal
Noise
0
0
-113.5
Attenuation (dB)
A
Analog
Digital
Figure 5. Hybrid Analog/Digital Attenuation
CS4222
DS236PP3
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CDB4224 | 24-Bit 105 dB Audio Codec with Volume Control |
| CDB4223 | 24-Bit 105 dB Audio Codec with Volume Control |
| CDB4225 | Digital Audio Conversion System |
| CDB4226 | Surround Sound Codec |
| CDB4228A | 24-Bit, 96 kHz Surround Sound Codec |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CDB4223 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:24-Bit 105 dB Audio Codec with Volume Control |
| CDB4224 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:24-Bit 105 dB Audio Codec with Volume Control |
| CDB4225 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:Digital Audio Conversion System |
| CDB4226 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:Surround Sound Codec |
| CDB4227 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:Six Channel, 20-Bit Codec |
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