ASAHI KASEI
[AK4370]
< Analog Mixing Circuit of Full-differential Mono input >
When LDIF=LIN1L=RIN1R bits = “1”, LIN1 and RIN1 pins becomes IN+ and IN− pins, respectively. IN+ and IN− pins
can be used as full-differential mono line input for analog mixing of LOUT/ROUT pins. It is not available to mix with
other signal source for LOUT/ROUT outputs.
If the path is OFF and the signal is input to the input pin, the input pin should be biased to a voltage equivalent to VCOM
voltage (= 0.475 x AVDD) externally. Figure 39 shows the external bias circuit example.
Figure 21
HPL/R pins
LOUT pin
LDIFH bit
R1L
100k(typ)
IN− pin
RL
LIN1L bit
LDIF bit
100k(typ)
RL
−
−
+
+
RL
R1L
100k(typ)
IN+ pin
RL
RIN1R bit
−
+
ROUT pin
−
+
Figure 23. Summation circuit for stereo line output (Full-differential input, LOG bit = “0”)
■ Stereo Line Output (LOUT/ROUT pins) Volume
LOUT/ROUT volume is controlled by ATTS3-0 bits when LMUTE bit = “0” (+6dB ∼ −24dB or 0dB ∼ −30dB, 2dB step,
Table 16). Pop noise occurs when ATTS3-0 bits are changed.
LOG bit = “1”
LMUTE
ATTS3-0
LOG bit = “0”
(DAC Only)
+6dB
+4dB
+2dB
0dB
FH
EH
DH
CH
:
0dB
−2dB
−4dB
−6dB
:
0
1
:
:
:
:
1H
0H
x
−22dB
−24dB
MUTE
−28dB
−30dB
MUTE
Default
Table 16. LOUT/ROUT Volume ATT values (x: Don’t care)
MS0595-E-00
2007/03
- 29 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
