AK4633EN Datasheet, PDF (43/83 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

[AK4633]
■ Output Digital volume (Manual mode)
When ADCPF bit = “0” and ALC2 bit = “0”, ALC block become an output digital volume (manual mode). The digital
volume’s gain is set by OVOL7-0 bits as shown in Table 21. The OVOL7-0 bits value are reflected to this output volume
at zero cross or zero cross time out. The zero crossing timeout period is set by ZTM1-0 bits.
OVOL7-0bits GAIN(0dB)
Step
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
92H
:
+0.375
0.375dB
91H
0.0
(default)
90H
-0.375
:
:
2H
-53.625
1H
-54.0
0H
MUTE
Table 21. Output Digital Volume Setting
When writing to the OVOL7-0 bits continually, the control register should be written by an interval more than zero
crossing timeout. If not, a zero crossing counter is reset each time and the volume will not be changed. However, it could
be ignored when writing a same register value as the last time. At this time, a zero crossing counter is not reset, so it can be
written by an interval less than zero crossing timeout.
■ Output Digital Volume2
AK4633 has 4 steps output volume in addition to the volume setting by OVOL7-0 bits. This volume is set by DATT1-0
bits as shown in Table 22.
DATT1-0bits GAIN(0dB)
Step
0H
0.0
1H
-6.0
6.0dB
2H
-12.0
3H
-18.1
Table 22. Output Digital Volume2 Setting
(default)
MS0447-E-06
- 43 -
2015/10