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參數(shù)資料
| 型號： | AK4628VQ |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | HIGH PERFORMANCE MULTI CHANNEL AUDIO CODEC |
| 中文描述： | 高性能多通道音頻解碼器 |
| 文件頁數(shù)： | 28/41頁 |
| 文件大?。?/td> | 546K |
| 代理商： | AK4628VQ |
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ASAHI KASEI
[AK4628]
MS0211-E-02
2004/03
- 28 -
DAC partial Power-Down Function
All DACs of AK4628 can be powered-down individually by PD1-4 bits. The analog part of DAC is in power-down by
PD1-4 bits =”1”, however, the digital part is not in power-down by it. Even if all DACs were set in power-down by the
partial power-down bits, the digital part continue to function. The analog output of the channel which is set in
power-down by PD1-4 bits is fixed to the voltage of VCOM. And though DZF detection is being done, the result of DZF
detection stops reflecting to DZF1-2 pins. Because some click noise occurs in both set-up and release of power-down,
either the analog output should be muted externally or PD1-4 bits should be set up when it is in PWDAN bit =”0” or
RSTN bit =”0”, if the click noise influences system application. Figure 16 shows the sequence of the power-down and the
power-up by PD1-4 bits.
PD1-4 bit
DZF1/DZF2
8192/fs
“0”data
DAC In
(Digital)
DAC Out
(Analog)
GD
GD
(1)
(3)
(3)
(2)
DAC Digital
Internal State
Normal Operation
NorNormal Operation
DAC Analog
Internal State
Power-down
Normal Operation
Clock In
MCLK,LRCK,SCLK
DAC In
(Digital)
DAC Out
(Analog)
Normal Operation Channel
(4)
(5)
GD
8192/fs
GD
Power-down
Normal Operation
(2)
(3)
(3)
(4)
Power Down Channel
DZF Detect
Internal State
DZF Detect
Internal State
“0”data
(6)
Notes:
(1) Digital output corresponding to analog input and analog output corresponding to digital input have the group delay
(GD).
(2) Analog output of the DAC powered down by PD1-4 =”1” is fixed to the voltage of VCOM.
(3) Immediately after PD1-4 bits are changed, some click noise occurs at the output of the channel changed by the own
PD bits.
(4) Though DZF detection is being done at a certain channel which set up PD1-4 =”1”, the result of DZF detection
stops reflecting to DZF1-2 pins.
(5) DZF detection of the DAC which is set up by the power-down setting is ignored, and DZF1-2 pins become ”H”.
(6) When the power-down function is set up and the channel has input signal, even if the partial power-down function
is set up, DZF1-2 bits do not become ”H”.
Figure 16. DAC partial power-down example
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相關代理商/技術參數(shù) |
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| AK4629 | 制造商:AKM 制造商全稱:AKM 功能描述:High Performance Multi-channel Audio CODEC |
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| AK4631 | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP |
| AK4631_1 | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ツヒ Mono CODEC with ALC & MIC/SPK-AMP |
| AK4631VN | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ツヒ Mono CODEC with ALC & MIC/SPK-AMP |
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