AK4371VN AKM [Asahi Kasei Microsystems], AK4371VN Datasheet - Page 33

• Manufacturer Part Number: AK4371VN
• Description: DAC with built-in PLL & HP-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

< Analog Mixing Circuit for Headphone Output >
DALHL, LIN1HL, RIN1HL, LIN2HL, RIN2HL, LIN3HL and RIN3HL bits control each path switch of HPL output.
DARHR, LIN1HR, RIN1HR, LIN2HR, RIN2HR, LIN3HR and RIN3HR bits control each path switch of HPR output.
When L1HM=L2HM=L3HM bits = “0”, HPG1-0 bits = “00” (R
“00H”(0dB), the mixing gain is +0.95dB(typ). When HPG1-0 bit = “01” (R
+6.95dB(typ). When HPG1-0 bit = “10” (R
L2HM and L3HM bits are “1”, LIN1/RIN1, LIN2/RIN2 and LIN3/RIN3 signals are output from HPL/R pins as (L+R)/2
respectively (R
When LDIF=LDIFH=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 for headphone-amp. In this case, LIN1HL,
RIN1HL, LIN1HR and RIN1HR 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. Figure 46 shows the external bias circuit example.
MS0596-E-00
1H
= R
RIN1 pin
RIN2 pin
RIN3 pin
RIN1 pin
RIN2 pin
RIN3 pin
LIN1 pin
LIN2 pin
LIN3 pin
LIN1 pin
LIN2 pin
LIN3 pin
Figure 27
Figure 27
2H
= R
DAC Rch
DAC Lch
3H
= 200k).
RIN1HR bit
RIN2HR bit
RIN3HR bit
RIN1HL bit
RIN2HL bit
RIN3HL bit
LIN1HR bit
LIN2HR bit
LIN3HR bit
DARHR bit
LIN1HL bit
LIN2HL bit
LIN3HL bit
DALHL bit
LDIFH bit
LDIFH bit
Figure 25. Summation circuit for HPL/R output
100k(typ)
100k(typ)
DH
R
R
R
R
R
R
R
R
R
R
R
R
R
R
= 25k), the mixing gain of DAC path is +12.95dB(typ). When L1HM,
DH
DH
1H
1H
2H
2H
3H
3H
1H
1H
2H
2H
3H
3H
100k(typ)
100k(typ)
−
+
−
+
- 33 -
1H
= R
R
R
H
H
2H
= R
DH
3H
−
+
−
+
HP-Amp
HP-Amp
1.11R
1.11R
= R
= 50k), the mixing gain of DAC path is
H
H
DH
= 100k) and ATTH4-0 bits =
HPL pin
HPR pin
[AK4371]
2007/04