AK4636 Datasheet, PDF (48/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
■ Output Digital volume (Manual mode)
When ADCPF bit = “0” and ALC2 bit = “0”, the ALC block becomes an output digital volume (manual mode). The
digital volume’s gain is set by OVOL7-0 bits as shown in Table 23. 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
:
:
0.375dB
92H
+0.375
91H
0.0
90H
-0.375
:
:
2H
-53.625
1H
-54.0
0H
MUTE
Table 23 Output Digital Volume Setting
(default)
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 at 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, zero crossing counter is not reset, so it
can be written by an interval less than zero crossing timeout.
■ Output Digital Volume2
AK4636 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 24.
DATT1-0bits GAIN(0dB)
Step
0H
0.0
1H
-6.0
6.0dB
2H
-12.0
3H
-18.1
Table 24. Output Digital Volume2 Setting
(default)
MS1012-E-01
- 48 -
2010/08