ak4372 ETC-unknow, ak4372 Datasheet - Page 34

• Manufacturer Part Number: ak4372
• Description: Dac With Built-in Pll & Hp-amp
• Manufacturer: ETC-unknow

< Analog Mixing Circuit of Full-differential Mono input >
When LDIF=LINL=RINR bits = “1”, the LIN and RIN pins becomes IN+ and IN− pins, respectively. The 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.
■
LOUT/ROUT volume is controlled by ATTS3-0 bits when LMUTE bit = “0” (+6dB ∼ −24dB or 0dB ∼ −30dB, 2dB step,
Table
MS0684-E-02
Stereo Line Output (LOUT/ROUT pins) Volume
26). Pop noise occurs when ATTS3-0 bits are changed.
IN− pin
IN+ pin
LMUTE
Figure 27. Summation circuit for stereo line output (Full-differential input)
0
1
Table 26. LOUT/ROUT Volume ATT values (x: Don’t care)
RINR bit
LINL bit
LDIF bit
ATTS3-0
Figure 51
100k(typ)
DH
EH
CH
FH
1H
0H
R
R
x
:
2L
2L
shows the external bias circuit example.
100k(typ)
100k(typ)
LOG bit = “1”
(DAC Only)
−
+
−
+
MUTE
−22dB
−24dB
+6dB
+4dB
+2dB
- 34 -
0dB
:
LDIFH bit
R
R
L
L
LOG bit = “0”
MUTE
−28dB
−30dB
−2dB
−4dB
−6dB
0dB
−
+
−
+
:
R
R
Figure 25
L
L
(default)
HPL/R pins
LOUT pin
ROUT pin
[AK4372]
2008/12