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參數(shù)資料
| 型號： | AK4560AVQ |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16bit CODEC with ALC and MIC/HP/SPK-Amps |
| 中文描述： | 16位編解碼器ALC和麥克風(fēng)/惠普/胰腎聯(lián)合移植，放大器 |
| 文件頁數(shù)： | 37/47頁 |
| 文件大?。?/td> | 339K |
| 代理商： | AK4560AVQ |
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ASAHI KASEI
[AK4560A]
MS0028-E-00
2000/05
- 37 -
Figure 28. Speaker-Amp Power-Down-Mode
1. Monaural Output
Both L/R channels of output signal from analog volume (OPGA) are mixed at (L+R)/2. When MOUT bit is “0”, these
signals can be OFF. Then MOUT pin outputs VCOM voltage. Load impedance is 10k
(min.).
When SPKP bit is “0”, MOUT pin becomes Power-Down-Mode and outputs Hi-z.
2. ALC2
Input resistance of ALC2 is 23k
(typ.) and centered around VCOM voltage, and input signal level is –5.5dBV. (Refer to
Figure 29)
Limiter detection level is not related to power supply voltage, output level is limited by the ALC2 circuit when input
signal exceeds –7.5dBV (=FS-2dB@VA=2.8V) and over.
When the continuous signal of –7.5dBV and over is input to the ALC2 circuit, the change period of ALC2 limiter
operation is 2/fs=42us@fs=48kHz and the attenuation level is 0.5dB/step.
The ALC2 recovery operation is always detected by zero crossing operation and gains 1dB/step. The ALC2 recovery
operation is done until input level of speaker-Amp goes to –9.5dBV(=FS-4dB@VA=2.8V). The ALC2 recovery
operation period is fixed to 2048/fs=42.7mS@fs=48kHz.
In case of inputting signal between –7.5dBV and –9.5dBV, the ALC2 limiter or recovery operations are not done.
When PD pin changes from “L” to “H” or SPKP bit changes from “0” to “1”, the initilizing cycle (2048/fs = 42.7ms
@fs=48kHz) starts. ALC2 is disabled during initilizing cycle, ALC2 starts after finishing the initilizing cycle.
Parameter
ALC2 Limiter operation
-7.5dBV
2/fs = 42us
2/fs = 63us
No
0.5dB step
Table 16. Content of ALC2
ALC2 Recovery operation
-9.5dBV
2048/fs = 42.7ms
2048/fs = 64ms
Yes(Timeout = 2048/fs )
1dB step
Operation Start Level
fs=48kHz
fs=32kHz
Period
Zero-crossing Detection
ATT/GAIN
+
-
8
SP0
+
-
R1
SPPS
SPPS
SPPS
SPPS
SP1
SPPS
or
SPKP
SPPS
SPKP
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| AK4563A | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power 16bit 4ch ADC & 2ch DAC with ALC |
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