AK4665A Datasheet, PDF (22/52 Pages) Asahi Kasei Microsystems – 20-Bit Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4665A]
„ Input Digital Volume (IVOL: Manual Mode)
The input digital volume becomes a manual mode when ALC1 bit is “0”. This mode is used in the case shown below.
1. After exiting reset state, set-up the registers for the ALC1 operation (ZTM1-0, LMTH and etc)
2. When the registers for the ALC1 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.
IVOL7-0 bits set the gain of the volume control (Table 16). The IVOL value is changed at zero crossing or timeout. Zero
crossing timeout period is set by ZTM1-0 bits.
If IVOL7-0 bits are written during PMADC bit = “0”, IVOL operation starts with the written values at the end of the ADC
initialization cycle after PMADC bit is changed to “1”.
IVOL7-0
FFH
FEH
FDH
:
92H
91H
90H
:
03H
02H
01H
00H
GAIN (dB)
Step
+41.25
+40.875
+40.5
:
+0.375
0.0
0.375dB
−0.375
:
−53.25
−53.625
−54
MUTE
Table 16. Input Digital Volume
Default
MS0440-E-01
- 22 -
2006/05