
[AK4673] 
MS0670-E-00 
2007/09 
- 55 - 
■
 Analog Mixing: Stereo Input (LIN2/RIN2/LIN4/RIN4, AIN3 bit = “1”: LIN3/RIN3 pins) 
When PMAINL2=PMAINR2 bits = “1”, LIN2 and RIN2 pins can be used as stereo line input for analog mixing. When 
the LINH2 and RINH2 bits are set to “1”, the input signal from the LIN2/RIN2 pins is output to Headphone-Amp. When 
the LINL2/RINR2 bits are set to “1”, the input signal from the LIN2/RIN2 pins is output to the stereo line output 
amplifier. 
When PMAINL4=PMAINR4 bits = “1”, LIN4 and RIN4 pins can be used as stereo line input for analog mixing. When 
the LINH4 and RINH4 bits are set to “1”, the input signal from the LIN4/RIN4 pins is output to Headphone-Amp. When 
the LINL4/RINR4 bits are set to “1”, the input signal from the LIN4/RIN4 pins is output to the stereo line output 
amplifier. 
When the analog mixing is used, A/D converter is also available if PMADL or PMADR bit is “1”. In this case, the input 
resistance of LIN2/RIN2/LIN4/RIN4 pins become 30k
Ω
 (typ) at MGAIN1-0 bits = “00” and 20k
Ω
 (typ) at MGAIN1-0 
bits = “01”, “10” or “11”, respectively. 
When AIN3 bit = “1”, the MIN and VCOC pins become LIN3 and RIN3 pins, respectively. In this case, PLL is not 
available. When PMAINL3=PMAINR3 bits = “1”, LIN3 and RIN3 pins can be used as stereo line input for analog 
mixing. When PMMICL=PMMICR=MICL3=MICR3 bits = “1”, analog mixing source is changed from LIN3/RIN3 
input to MIC-Amp output signal. When the LINH3 and RINH3 bits are set to “1”, the input signal from the LIN3/RIN3 
pins is output to Headphone-Amp. When the LINL3/RINR3 bits are set to “1”, the input signal from the LIN3/RIN3 pins 
is output to the stereo line output amplifier. 
When the analog mixing is used, A/D converter is also available if PMADL or PMADR bit is “1”. When the analog 
mixing is used at MICL3=MICR3 bits = “0”, the input resistance of LIN3/RIN3 pins becomes 30k
Ω
 (typ) at MGAIN1-0 
bits = “00” and 20k
Ω
 (typ) at MGAIN1-0 bits = “01”, “10” or “11”, respectively. When the analog mixing is used at 
MICL3=MICR3 bits = “1”, the input resistance of LIN3/RIN3 pins becomes 60k
Ω
 (typ) at MGAIN1-0 bits = “00” and 
30k
Ω
 (typ) at MGAIN1-0 bits = “01”, “10” or “11”, respectively. 
Table 41
, 
Table 42
 and 
Table 43
 show the typical gain. 
AK4673 
LIN1/IN1
 pin 
ADC Lch
RIN1/IN1+ pin
INL1-0 bits
MDIF1 bit
RIN2/IN2
 pin 
ADC Rch 
LIN2/IN2+ pin 
INR1-0 bits
MDIF2 bit
MIN/LIN3 pin 
VCOC/RIN3 pin 
Lineout, HP-Amp 
MIC-Amp
MIC-Amp
M
M
P
P
P
P
P
P
LIN4/IN4+ pin 
RIN4/IN4
 pin 
These blocks are not 
 available at PLL mode. 
Figure 39. Analog Mixing Circuit (Stereo Input)