ak4646 AKM Semiconductor, Inc., ak4646 Datasheet - Page 43

• Manufacturer Part Number: ak4646
• Description: Stereo Codec With Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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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.
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”.
MS0557-E-02
Input Digital Volume (Manual Mode)
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.
3. When IVOL is used as a manual volume.
For example; when the change of the sampling frequency.
IVL7-0
IVR7-0
EFH
E2H
E1H
E0H
F1H
F0H
03H
02H
01H
00H
:
:
Table 34. Input Digital Volume Setting
GAIN (dB)
+35.625
+30.375
+29.625
− 53.625
+35.25
− 53.25
MUTE
+36.0
+30.0
− 54
:
:
- 43 -
0.375dB
Step
(default)
[AK4646]
2007/05