AK4601VQ Datasheet, PDF (73/111 Pages) Asahi Kasei Microsystems – Audio HUB CODEC with Digital Mixer

[AK4601]
■ Mixer
The AK4601 has two stereo input mixers that have level adjustment function for overflow protection after
adding and data change function (Mixer A and Mixer B). Level adjustment is processed by shift
operation. Since the level adjustment function is only for avoiding overflow by adding, it can only shift
1bit to the right.
Mixer A is controlled by SFTA1[1:0] bits, SFTA2[1:0] bits, SWPA1[1:0] bits and SWPA2[1:0] bits.
Mixer B is controlled by SFTB1[1:0] bits, SFTB2[1:0] bits, SWPB1[1:0] bits and SWPB2[1:0] bits.
Serial Data
Bus
SELMIXxI1[5:0]
Stereo (1)
SFTx1[1:0] SWPx1[1:0]
L(1)
L(1’)
Shift
or
mute
R(1)
R(1’)
L(1’’)
R(1’’)
L(Q)
Serial Data
Bus
SELMIXxI2[5:0]
Stereo (2)
SFTx2[1:0] SWPx2[1:0]
L(2)
L(2’)
Shift
or
mute
R(2)
R(2’)
L(2’’)
R(2’’)
Stereo (Q)
R(Q)
x = A or B
Figure 65. Block Diagram of the Mixer
Mode
0
1
2
3
SFTA1[1:0] / SFTA2[1:0] bits
SFTB1[1:0] / SFTB2[1:0] bits
00
Shift Amount
No Shift
L(y’)
(y=1 or 2)
L(y)
R(y’)
(y=1 or 2)
R(y)
01
1 bit Right Shift L(y) >> 1 R(y) >>1
10
11
Mute
0
0
Table 34. Level Adjustment of the Mixer
Comment
0dB
About -6dB
(x 1/2)
-∞dB
Mode
0
1
2
3
SWPA1[1:0] / SWPA2[1:0] bits
SWPB1[1:0] / SWPB2[1:0] bits
00
01
10
L(y’’)
(y=1 or 2)
L(y’)
L(y’)
R(y’)
R(y’’)
(y=1 or 2)
R(y’)
L(y’)
R(y’)
11
R(y’)
L(y’)
Table 35. Data Change Function of the Mixer
Comment
Through
Lin → Lout, Rout
Rin → Lout, Rout
Swap Signal
Lin → Rout
Rin → Lout
016000391-E-01
- 73 -
2016/12