Datasheet

[AK4646]
MS0557-E-06 2011/06
- 43 -
■ Input Digital Volume (Manual Mode)
The input digital volume becomes a manual mode at ALC1 bit = “0” when either Lch and Rch of ADC is powered-up
(PMADL bit = “1” or PMADR bit = “1”) and DAFIL bit is “0”. 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 = “0”, IVOL operation starts with the written values at the end of the ADC initialization cycle
after PMADL or PMADR bit is changed to “1”.
If IVL7-0 or IVR7-0 bits are written during PMADL=PMADR bits = “0”, IVOL operation starts with the written values
at the end of the ADC initialization cycle after PMADL or PMADR bit is changed to “1”.
IVL7-0
IVR7-0
GAIN (dB) Step
F1H +36.0
F0H +35.625
EFH +35.25
: :
E2H +30.375
E1H +30.0 (default)
E0H +29.625
: :
03H
−53.25
02H
−53.625
01H
−54
0.375dB
00H MUTE
Table 34. Input Digital Volume Setting