參數資料
型號： AK4538VN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16Bit DS CODEC with MIC/HP/SPK-AMP
中文描述： 16位副編解碼器麥克風/惠普/胰腎聯合移植腺苷
文件頁數： 36/70頁
文件大小： 485K
代理商： AK4538VN
ASAHI KASEI
[AK4538]
MS0198-E-01
2003/5
- 36 -
n
ALC2 Operation
Input resistance of the ALC2 is 24k
(typ) and centered around VCOM voltage, and the input signal level is –3.1dBV. (see
Figure 31. 0dBV=1Vrms=2.828Vpp)
The limiter detection level is proportional to HVDD. The output level is limited by the ALC2 circuit when the input signal
exceeds –5.2dBV (=FS-1.9dB@HVDD=3.3V). When a continuous signal of –5.2dBV or greater is input to the ALC2
circuit, the change period of the ALC2 limiter operation is set by the ROTM bit and the attenuation level is 0.5dB/step.
The ALC2 recovery operation uses zero crossings and gains of 1dB/step. The ALC2 recovery operation is done until the
input level of the Speaker-amp goes to –7.2dBV(=FS-3.9dB@HVDD=3.3V). The ROTM bit sets the ALC2 recovery
operation period.
When the input signal is between –5.2dBV and –7.2dBV, the ALC2 limiter or recovery operations are not done.
When the PMSPK bit changes from “0” to “1”, the initilization cycle (2048/fs = 46.4ms @fs=44.1kHz at ROTM bit = “0”,
512/fs = 11.4ms @fs=44.1kHz at the ROTM bit = “1”) starts. The ALC2 is disabled during the initilization cycle and the
ALC2 starts after completing the initilization cycle.
Parameter
ALC2 Limiter operation
Operation Start Level
5.2dBV
ROTM bit = “0”
2/fs = 45
μ
s (at 44.1kHz)
Period
ROTM bit = “1”
2/fs = 180
μ
s (at 11.025kHz)
Zero-crossing Detection
No
ATT/GAIN
0.5dB step
Table 24. Limiter /Recovery of ALC2 at HVDD=3.3V
ALC2 Recovery operation
7.2dBV
2048/fs=46.4ms (at 44.1kHz)
512/fs=46.4ms (at 11.025kHz)
Yes (Timeout = Period Time)
1dB step
0dBV
-10dBV
-20dBV
-30dBV
ALC2
ATT+DAC
SPK-AMP
FS
FS-12dB
-23.3dBV
-11.3dBV
FS-1.9dB = -5.2dBV
0.4dBV
-5.6dBV
+5.6dB
-0.4dB
-3.3dBV
-1.9dB
-15.3dBV
+4.1dB
+8.1dB
+16.1dB
-8dB
-8dB
Full-differential
Single-ended
FS-3.9dB = -7.2dBV
-3.3dBV
-15.3dBV
-1.6dBV
Figure 31. Speaker-amp Output Level Diagram (HVDD=3.3V, DATT=
8.0dB)
相關PDF資料
PDF描述
AK4541VQ AC’97 Rev 2.1 Multimedia Audio CODEC
AK4541 AC’97 Rev 2.1 Multimedia Audio CODEC
AK4543 AC’97 Rev 2.1 Multimedia Audio CODEC
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AK4544A AC97 MULTIMEDIA AUDIO CODEC WITH SRC
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參數描述
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AK4543 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC
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AK4544 制造商:AKM 制造商全稱:AKM 功能描述:AC97 MULTIMEDIA AUDIO CODEC WITH SRC
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