AK4753 Datasheet, PDF (36/85 Pages) Asahi Kasei Microsystems – 2-in, 4-out CODEC with DSP Functions

[AK4753]
2. Stereo mode (HPF, LPF individual mode)
(SPC1-0 bits = “01”: SW2 = “0”, SW3= “1”, SW4= “0”, SW5= “0”, SW6= “0”)
Table 21 shows the signal status and output condition when SPC1-0 bits = “01”. This output configuration is suitable
for a stereo speaker system which needs individual effects of DSP. L1(Hi), L2(Lo), R1 (Hi) and R2 (Lo) is an example
of the DSP setting. L1(Hi), R1(Hi) are signals which were after HPF in DSP1. And L2(Lo), R2(Lo) are signals which
were applied LPF in DSP2. Refer to the Figure 55 for functions and signal paths of the DSP block.
Digital-in
ADC
SEL1-0 bit SPC1-0 bit
SW1
SW2, 3, 4, 5, 6
L, R
1: L1+L2, R1+R2
DSP1
for L1, R1
HPF, LPF
EQ, Limiter
L1, R1
SW3
0
1
DAC1
DIG
L1+L2, R1+R2
+
DAC1L
ANA
SW5
−₀
1
DAC1R
ANA
DATT
DSP2
SW2 for L2, R2
0
MIX
HPF, LPF
1 _{EQ, Limiter} L2, R2
0: L, R
DAC2
DIG
SW4
0
1
+ DAC2L
ANA
SW6
−₀
1
DAC2R
ANA
+( L1+L2 )
−( L1+L2 )
+( R1+R2 )
−( R1+R2 )
Figure 49. Block Diagram for Signal Path (SPC1-0 bits = “01”)
Output Setting
SPC1 bit SPC0 bit
0
1
Signal and Output Block
Audio Signal Polarity DAC
L1(Hi)+L2(Lo)
+
DAC1L
−
DAC1R
R1(Hi)+R2(Lo)
+
DAC2L
−
DAC2R
Pin
LOUT+
LOUT−
ROUT+
ROUT−
Table 21. Stereo Mode Setting and Output Signal Status Details
Output
L+
L−
R+
R−
Digital Source
Analog Source
L ch
R ch
Digital-in
Block1
L1+L2→ ^LOUT+
LOUT−
AK4753
Block2
Analog-in
R1+R2→ ^ROUT+
ROUT−
Figure 50. 2-channels (Stereo) Mode
L ch
2-channel
(Full-differential)
R ch
MS1311-E-00
- 36 -
2011/07