ak4372 ETC-unknow, ak4372 Datasheet - Page 31

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

< Analog Mixing Circuit for Headphone Output >
DALHL, LINHL, RINHL and MINHL bits control each path switch of the HPL output. DARHR, LINHR, RINHR and
MINHR bits control each path switch of the HPR output.
When LHM bit = “0”, HPG1-0 bits = “00” (R
+0.95dB(typ). When HPG1-0 bit = “01” (R
“10” (R
from the HPL/R pins as (L+R)/2 respectively.
When LDIF=LDIFH=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 for headphone-amp. In this case, LINHL,
RINHL, LINHR and RINHR bits should be “0”.
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.
MS0684-E-02
DH
= 25k), the mixing gain of DAC path is +12.95dB(typ). When LHM bit is “1”, LIN and RIN signals are output
Figure 27
MIN pin
Figure 27
MIN pin
RIN pin
RIN pin
LIN pin
LIN pin
DAC Rch
DAC Lch
DARHR bit
MINHL bit
DALHL bit
RINHR bit
MINHR bit
RINHL bit
LINHR bit
LDIFH bit
LINHL bit
LDIFH bit
Figure 25. Summation circuit for HPL/R output
Figure 51
100k(typ)
100k(typ)
DH
R
R
R
R
R
R
R
R
1H
1H
2H
DH
1H
1H
2H
DH
1H
= 50k), the mixing gain of DAC path is +6.95dB(typ). When HPG1-0 bit =
= R
shows the external bias circuit example.
2H
= R
100k(typ)
100k(typ)
−
+
−
+
DH
= 100k) and ATTH4-0 bits = “00H”(0dB), the mixing gain is
- 31 -
R
R
H
H
−
+
−
+
HP-Amp
HP-Amp
1.11R
1.11R
H
H
HPL pin
HPR pin
[AK4372]
2008/12