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AK4646EZ Datasheet, PDF (43/78 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/SPK-AMP | |||
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[AK4646EZ]
â Input Digital Volume (Manual Mode)
The input digital volume becomes a manual mode at ALC1 bit = â0â when either Lch and Rch of ADC is powered-up
(PMADL bit = â1â or PMADR bit = â1â) and DAFIL bit is â0â. This mode is used in the case shown below.
1. After exiting reset state, set-up the registers for the ALC operation (ZTM1-0, LMTH and etc)
2. When the registers for the ALC operation (Limiter period, Recovery period and etc) are changed.
For example; when the change of the sampling frequency.
3. When IVOL is used as a manual volume.
IVL7-0 and IVR7-0 bits set the gain of the volume control (Table 34). The IVOL value is changed at zero crossing or
timeout. The zero crossing timeout period is set by ZTM1-0 bits. If IVL7-0 or IVR7-0 bits are written during
PMADL=PMADR bits = â0â, IVOL operation starts with the written values at the end of the ADC initialization cycle
after PMADL or PMADR bit is changed to â1â.
If IVL7-0 or IVR7-0 bits are written during PMADL=PMADR bits = â0â, IVOL operation starts with the written values
at the end of the ADC initialization cycle after PMADL or PMADR bit is changed to â1â.
IVL7-0
IVR7-0
F1H
F0H
EFH
:
E2H
E1H
E0H
:
03H
02H
01H
00H
GAIN (dB)
Step
+36.0
+35.625
+35.25
:
+30.375
+30.0
0.375dB
+29.625
:
â53.25
â53.625
â54
MUTE
Table 34. Input Digital Volume Setting
(default)
MS0630-E-00
- 43 -
2007/06
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