AK4671_10 Datasheet, PDF (76/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
■ Digital Volume for Recording of Received Voice (DATT-B)
The AK4671 has a digital output volume (DATT-B: 256 levels, 0.5dB step, Mute) for recording of received voice. The
volume can be set by the BVL7-0 bits. The volume is included in front of an SRC-B block. The input data of SRC-B is
changed from +12 to –115dB or MUTE. This volume has a soft transit function. The transition time between set values of
BVL7-0 bits is 256/fs2. It takes 256/fs2 (=32ms@fs2=8kHz) from 00H (+12dB) to FFH (MUTE).
(default)
BVL7-0
Gain
Step
00H
+12.0dB
01H
+11.5dB
02H
+11.0dB
:
18H
:
0dB
0.5dB
:
:
FDH
−114.5dB
FEH
−115.0dB
FFH
MUTE (−∞)
Table 38. Digital Volume B Code Table
■ Digital Volume for Received Voice (DATT-C)
The AK4671 has a digital output volume (DATT-C: 256 levels, 0.5dB step, Mute) for received voice. The volume can be
set by the CVL7-0 bits. The volume is included in front of SDTOB output. The input data of SRC-C is changed from +12
to –115dB or MUTE. This volume has a soft transition function. The transition time between set values of CVL7-0 bits is
256/fs2. It takes 256/fs2 (=32ms@fs2=8kHz) from 00H (+12dB) to FFH (MUTE).
(default)
CVL7-0
Gain
Step
00H
+12.0dB
01H
+11.5dB
02H
+11.0dB
:
18H
:
0dB
0.5dB
:
:
FDH
−114.5dB
FEH
−115.0dB
FFH
MUTE (−∞)
Table 39. Digital Volume C Code Table
■ Side Tone Volume for B/T Phone Call (SVOLB)
The AK4671 has the side tone volume (5 levels, 6dB step) for B/T phone call. The volume can be set by the SVL2-0 bits.
The volume is included at mixing path from SRC-A to DATT-C. The output data of SRC-A is changed from 0 to –24dB.
SVB2-0
Gain
0H
0dB
(default)
1H
−6dB
2H
−12dB
3H
−18dB
4H
−24dB
Others
N/A
Table 40. Side Tone Volume B Code Table (N/A: Not available)
MS0666-E-02
- 76 -
2010/06