參數(shù)資料
型號(hào)： AK4561
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(nèi)置麥克風(fēng)/惠普放大器
文件頁(yè)數(shù)： 40/48頁(yè)
文件大?。?/td> 332K
代理商： AK4561
ASAHI KASEI
AKM CONFIDENTIAL
[AK4561]
Rev. 0.9
2000/09
- 40 -
2. ALC Recovery Operation
The ALC recovery operation waits until a time of setting WTM1-0 bits after completing the ALC limiter. If the input
signal does not exceed “Recovery waiting counter reset level ”, the ALC recovery operation is done. The IPGA value
increases automatically by this operation up to the set reference level (REF6-0 bits). Then the IPGA value is set for L/R
commonly. The ALC recovery operation is done at a period set by WTM1-0 bits.
When L/R channels are detected by zero crossing operation during WTM1-0, the ALC recovery operation waits until
WTM1-0 period and the next recovery operation is done.
During the ALC recovery operation, when either input signal level of Lch or Rch exceeds the ALC limiter detection level
(LMTH), the ALC recovery operation changes into the ALC limiter operation immediately
In case of “(Recovery waiting counter reset level)
≤
Input Signal < (Limiter detection level)” during the ALC recovery
operation, the waiting timer of ALC recovery operation is reset. Therefore, in case of “(Recovery waiting counter reset
level) > Input Signal”, the waiting timer of ALC recovery operation starts.
During recovery counter reset
Limiter detection level (LMTH)
Recovery waiting counter
reset level (LMTH)
Zero crossing detect
WTM counter starts
WTM counter starts
WTM counter starts
ZTM counter starts
ZTM counter starts
(1)
(2)
(2)
WTM counter starts
(2)
Figure 28. The transition from the limiter operation to the recovery operation
(1). When the input signal is below the ALC recovery waiting counter reset level, the ALC recovery operation waits the
time set by WTM1-0 bits. If the input signal does not exceed the ALC limiter detection level or the ALC recovery
waiting counter reset level, the ALC recovery operation is done only once.
(2). The IPGA value is changed by the zero crossing operation in ALC recovery operation, but the next counter of the
ALC recovery waiting timer is also starting.
Other:
When a channel of one side enters the limiter operation during the waiting zero crossing, the present ALC recovery
operation stops, according as the small value of IPGA (a channel of waiting zero crossing), the ALC limiter operation is
done.
When both channels are waiting for the next ALC recovery operation, the ALC limiter operation is done from the IPGA
value of a point in time.
During the ALC operation, the value of writing in IPGA6-0 bits is ignored.
相關(guān)PDF資料
PDF描述
AK4561VQ 16bit CODEC with built-in ALC and MIC/HP-Amp
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4561VQ 制造商:AKM 制造商全稱:AKM 功能描述:16bit CODEC with built-in ALC and MIC/HP-Amp
AK4562 制造商:AKM 制造商全稱:AKM 功能描述:EVALUATION BOARD REV.A FOR AK4562
AK4562VN 制造商:AKM 制造商全稱:AKM 功能描述:LOW POWER 20BIT CODEC WITH PGA
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
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