參數(shù)資料
型號(hào)： AK4534
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16Bit CODEC with MIC/HP/SPK-AMP
中文描述： 16位編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁(yè)數(shù)： 33/64頁(yè)
文件大?。?/td> 443K
代理商： AK4534
ASAHI KASEI
[AK4534]
MS0133-E-03
2003/5
- 33 -
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 18. 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 20. 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 18. Speaker-amp Output Level Diagram (HVDD=3.3V, DATT=
8.0dB)
相關(guān)PDF資料
PDF描述
AK4534VN 16Bit CODEC with MIC/HP/SPK-AMP
AK4536 16-Bit Mono CODEC with ALC & MIC/SPK-AMP
AK4536VN 16-Bit Mono CODEC with ALC & MIC/SPK-AMP
AK4537 16-Bit ツヒ Stereo CODEC with MIC/HP/SPK-AMP
AK4537VN 16-Bit ツヒ Stereo CODEC with MIC/HP/SPK-AMP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4534VN 制造商:AKM 制造商全稱:AKM 功能描述:16Bit CODEC with MIC/HP/SPK-AMP
AK4534VQ 功能描述:IC CODEC 16BIT MIC/HP/SPK-AMP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購(gòu)買(mǎi)時(shí)間 標(biāo)準(zhǔn)包裝:1,000
AK4536 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP
AK4536VN 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP
AK4537 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP
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