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參數(shù)資料
| 型號(hào)： | AK4650VG |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
| 中文描述： | 16位ツヒ編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁(yè)數(shù)： | 29/86頁(yè) |
| 文件大?。?/td> | 824K |
| 代理商： | AK4650VG |
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[AK4650]
MS0502-E-01
2007/04
- 29 -
■
MIC-ALC Operation
The ALC (Automatic Level Control) of MIC input is done by ALC1 block when ALC1 bit is “1”.
(1)
ALC1 Limiter Operation
When the ALC1 limiter is enabled, and IPGA output exceeds the ALC1 limiter detection level (LMTH bit: Table 15), the
IPGA value is attenuated by the amount defined in the ALC1 limiter ATT step (LMAT1-0 bits: Table 16) automatically.
When the ZELMN bit = “1”, the timeout period is set by the LTM1-0 bits (Table 17). The operation for attenuation is
done continuously until the IPGA output signal level becomes LMTH or less. If the ALC1 bit does not change into “0”
after completing the attenuation, the attenuation operation repeats while the IPGA output signal level equals or exceeds
LMTH.
When the ZELMN bit = “0”, the timeout period is set by the ZTM1-0 bits (Table 18). This enables the zero-crossing
attenuation function so that the IPGA value is attenuated at the zero-detect points of the waveform.
LMTH
ALC1 Limiter Detection Level
ALC1 Recovery Waiting Counter Reset Level
0
ADC Input
≥
6.0dBFS
6.0dBFS
>
ADC Input
≥
8.0dBFS
1
ADC Input
≥
4.0dBFS
4.0dBFS
>
ADC Input
≥
6.0dBFS
Table 15. ALC1 Limiter Detection Level / Recovery Waiting Counter Reset Level
LMAT1
LMAT0
0
0
0
1
1
0
1
1
Table 16. ALC1 Limiter ATT Step Setting
Note: When IPGA gain is 0dB or less, ALC1 limiter ATT step is fixed to 1 regardless as LMAT1-0 bits.
ALC1 Limiter Operation Period
LTM1
LTM0
8kHz
0
0
0.5/fs
63
μ
s
0
1
1/fs
125
μ
s
1
0
2/fs
250
μ
s
1
1
4/fs
500
μ
s
Table 17. ALC1 Limiter Operation Period at zero crossing disable (ZELMN bit = “1”)
Zero Crossing Timeout Period
ZTM1
ZTM0
8kHz
0
0
128/fs
16ms
0
1
256/fs
32ms
1
0
512/fs
64ms
1
1
1024/fs
128ms
Table 18. Zero Crossing Timeout Period
(default)
ATT STEP
0.5dB
1.0dB
1.5dB
2.0dB
(default)
(default)
16kHz
31
μ
s
63
μ
s
125
μ
s
250
μ
s
44.1kHz
11
μ
s
23
μ
s
45
μ
s
91
μ
s
(default)
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4651 | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4651VG | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4665A | 20-Bit Stereo CODEC with MIC/HP-AMP |
| AK4665AEN | 20-Bit Stereo CODEC with MIC/HP-AMP |
| AK4671 | Stereo CODEC with MIC/RCV/HP-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4651 | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4651VG | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4664VQ | 功能描述:IC CODEC STEREO 20BIT LQFP 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 |
| AK4665A | 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP |
| AK4665AEN | 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP |
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