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參數(shù)資料
| 型號： | AK5701KN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 16-Bit ツヒ Stereo ADC with PLL & MIC-AMP |
| 中文描述： | 16位ツヒ立體聲ADC帶鎖相環(huán) |
| 文件頁數(shù)： | 36/64頁 |
| 文件大小： | 747K |
| 代理商： | AK5701KN |
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[AK5701]
2.
ALC Recovery Operation
The ALC recovery operation waits for the WTM1-0 bits (
Table 25
) to be set after completing the ALC limiter operation.
If the input signal does not exceed “ALC recovery waiting counter reset level” (
Table 22
) during the wait time, the ALC
recovery operation is executed. The IVL and IVR values are automatically incremented by RGAIN1-0 bits (
Table 26
) up
to the set reference level (
Table 27
) with zero crossing detection which is timeout period set by ZTM1-0 bits (
Table 24
).
Then the IVL and IVR are set to the same value for both channels. The ALC recovery operation is executed at a period set
by WTM1-0 bits. If ZTM1-0 is longer than WTM1-0 and no zero crossing occurs, the ALC recovery operation is
executed at a period set by ZTM1-0 bits.
For example, when the current IVOL value is 30H and RGAIN1-0 bits are set to “01”, IVOL is changed to 32H by the
auto limiter operation and then the input signal level is gained by 0.75dB (=0.375dB x 2). When the IVOL value exceeds
the reference level (REF7-0), the IVOL values are not increased.
When
“ALC recovery waiting counter reset level (LMTH1-0)
≤
Output Signal < ALC limiter detection level (LMTH1-0)”
during the ALC recovery operation, the waiting timer of ALC recovery operation is reset. When
“ALC recovery waiting counter reset level (LMTH1-0) > Output Signal”,
the waiting timer of ALC recovery operation starts.
The ALC operation corresponds to the impulse noise. When the impulse noise is input, the ALC recovery operation
becomes faster than a normal recovery operation. When large noise is input to microphone instantaneously, the quality of
small level in the large noise can be improved by this fast recovery operation.
ALC Recovery Operation Waiting Period
WTM1
WTM0
8kHz
0
0
128/fs
16ms
0
1
256/fs
32ms
1
0
512/fs
64ms
1
1
1024/fs
128ms
Table 25. ALC Recovery Operation Waiting Period
RGAIN1
RGAIN0
0
0
1 step
0
1
2 step
1
0
3 step
1
1
4 step
Table 26. ALC Recovery GAIN Step
REF7-0
GAIN(dB)
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
E2H
+30.375
E1H
+30.0
E0H
+29.625
:
:
03H
53.25
02H
53.625
01H
54.0
00H
MUTE
Table 27. Reference Level at ALC Recovery operation
(default)
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
GAIN STEP
(default)
0.375dB
0.750dB
1.125dB
1.500dB
Step
(default)
0.375dB
MS0404-E-02
2007/08
- 36 -
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| AK5701 | digital audio 16bit A/D converter |
| AK5702 | 4-Channel ADC with PLL & MIC-AMP |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AK5701KNP-L | 制造商:AKM Semiconductor Inc 功能描述:AK5701KNP-L |
| AK5701VN | 制造商:AKM 制造商全稱:AKM 功能描述:PLL & MIC-AMP 16-Bit Stereo ADC |
| AK5701VNP-L | 功能描述:IC ADC AUDIO STER 16BIT 24QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Basics 標(biāo)準(zhǔn)包裝:1 系列:- 類型:電機(jī)控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應(yīng)商設(shè)備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1 |
| AK5702 | 制造商:AKM 制造商全稱:AKM 功能描述:portable digital audio 16bit A/D converter |
| AK5702VN | 制造商:AKM 制造商全稱:AKM 功能描述:4-Channel ADC with PLL & MIC-AMP |
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