AK4679EG Datasheet, PDF (96/220 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with DSP and MIC/RCV/HP/SPK/LINE-AMP

[AK4679]
(3-2) Dynamic Volume Control Curve
The inflection points of the DVLC curve is set by three coordinate values (VH1X5-0, VH1Y5-0, VH2X5-0, VH2Y5-0,
VH3X4-0 and VH3Y4-0 bits). The setting of three inflection points are calculated the values of (X1_H, Y1_H), (X2_H,
Y2H_H), (X3_H, Y3_H) in dB. The inflection points should be set in such a way that VH1X ≤ VH2X ≤ VH3X, VH1Y ≤
VH2Y ≤ VH3Y. And the each slope is set by H1G6-0, H2G6-0, H3G6-0 and H4G6-0 bits. X4_H is fixed full-scale, Y4_H is
calculated by the H4G value. The initial value of the DVLC gain is set by the H1G.
Full scale
(X3_H, Y3_H)
(X2_H, Y2_H) _H3G
H4G
(X4_H, Y4_H)
(X1_H, Y1_H)
H2G
H1G
(0, 0)
DVLC Input Level
Full scale
Figure 74. DVLC Curve for High Frequency Range
VH1X/Y5-0 bits Dynamic Volume Control Point
VH2X/Y5-0 bits
[dBFS]
Step
00H
0
(default)
01H
−1.5
02H
−3.0
1.5dB
:
:
2EH
−69.0
2FH
−70.5
30H
N/A
:
:
N/A
3FH
N/A
Table 59. DVLC Point Setting for X/Y1, X/Y2 (N/A: Not available)
VH3X/Y4-0 bits
00H
01H
02H
:
1EH
1FH
Dynamic Volume Control Point
[dBFS]
Step
0
−1.5
−3.0
1.5dB
:
−45.0
−46.5
Table 60. DVLC Point Setting for X/Y3
(default)
MS1402-E-06
- 96 -
2013/02