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參數(shù)資料
| 型號： | AK4561VQ |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16bit CODEC with built-in ALC and MIC/HP-Amp |
| 中文描述： | 16位編解碼器在ALC和內置麥克風/惠普放大器 |
| 文件頁數(shù)： | 23/48頁 |
| 文件大?。?/td> | 332K |
| 代理商： | AK4561VQ |
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ASAHI KASEI
AKM CONFIDENTIAL
[AK4561]
Rev. 0.9
2000/09
- 23 -
ALC
Mode
Control
1
Addr
05H
ALC Mode Control 1
RESET
LMTH: ALC Limiter Detection Level / Recovery Waiting Counter Reset Level
LMTH
ALC Limiter Detection Level
0
ADC Input
≥
-5.0dB
1
ADC Input
≥
-3.0dB
Table 10. ALC Limiter Detection Level / Recovery Waiting Counter Reset Level
Register Name
D7
0
0
D6
0
0
D5
D4
D3
D2
D1
D0
ZELM
0
LMAT1
0
LMAT0
0
FDATT
0
RATT
0
LMTH
0
ALC Recovery Waiting Counter Reset Level
-5.0dB > ADC Input
≥
-7.0dB
-3.0dB > ADC Input
≥
-5.0dB
RESET
RATT: ALC Recovery GAIN Step
During the ALC Recovery operation, the number of steps changed from current IPGA value is
set. For example, when the current IPGA value is 30H, RATT = “1” is set, IPGA changes to 32H
by the ALC recovery operation, the input signal level is gained by 1dB (=0.5dB x 2).
When the IPGA value exceeds the reference level (REF6-0), the IPGA value does not increase.
RATT
0
1
GAIN STEP
1
2
RESET
Table 11. ALC Recovery GAIN Step Setting
FDATT: FADEIN/OUT ATT Step
During the FADEIN/OUT operation, the number of steps changed from current IPGA value is
set. For example, when the current IPGA value is 30H, FDATT = “1” is set, IPGA changes to
32H(at FADEIN operation) or 2EH (at FADEOUT operation) by the FADEIN/OUT operation,
the input signal level is changed by 1dB (=0.5dB x 2).
When the IPGA value exceeds the reference level (REF6-0), the IPGA value does not increase.
FDATT
ATT STEP
0
1
1
2
Table 12. FADEIN/OUT ATT Step Setting
RESET
LMAT1-0: ALC Limiter ATT Step
During the ALC limiter operation, when either Lch or Rch exceeds the ALC limiter detection
level set by LMTH, the number of steps attenuated from current IPGA value is set. For example,
when the current IPGA value is 68H in the state of LMAT1-0 bit = “11”, it becomes IPGA = 64H
by the ALC limiter operation, the input signal level is attenuated by 2dB (=0.5dB x 4).
When the attenuation value exceeds IPGA = “00” (MUTE), it clips to “00”.
LMAT1
0
0
1
1
Table 13. ALC Limiter ATT Step Setting
LMAT0
0
1
0
1
ATT STEP
1
2
3
4
RESET
ZELM: Enable zero crossing detection at ALC Limiter operation
0: Disable (RESET)
1: Enable
In case of ZELM = “1”, IPGA of each L/R channel do zero crossing or timeout independently, the
IPGA value is changed by ALC operation. Zero crossing timeout is the same as ALC recovery
operation. In case of ZELM = “0”, the IPGA value is changed immediately.
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PDF描述 |
|---|---|
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相關代理商/技術參數(shù) |
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| AK4562 | 制造商:AKM 制造商全稱:AKM 功能描述:EVALUATION BOARD REV.A FOR AK4562 |
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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 |
| AK4563AVF | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power 16bit 4ch ADC & 2ch DAC with ALC |
| AK4564 | 制造商:AKM 制造商全稱:AKM 功能描述:16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP |
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