AK4644 Datasheet, PDF (51/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/RCV-AMP

ASAHI KASEI
[AK4644]
„ Analog Mixing: Stereo Input (LIN2/RIN2, 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 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 pins becomes 30kΩ (typ) at MGAIN1-0 bits = “00” and 20kΩ (typ) at MGAIN1-0 bits = “01”,
“10” or “11”, respectively.
When AIN3 bit = “1”, MIN and VCOC pins becomes LIN3 and RIN3 pins, respectively. In this case, PLL is not
available. When PMAINL3=PMAINR3 bits = “1”, LIN2 and RIN2 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 30kΩ (typ) at MGAIN1-0
bits = “00” and 20kΩ (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 60kΩ (typ) at MGAIN1-0 bits = “00” and
30kΩ (typ) at MGAIN1-0 bits = “01”, “10” or “11”, respectively.
Table 41, Table 42 and Table 43 show the typical gain.
AK4644
LIN1/IN1− pin
RIN1/IN1+ pin
INL1-0 bits
MDIF1 bit ^MIC-Amp
ADC Lch
RIN2/IN2− pin
LIN2/IN2+ pin
MIN/LIN3 pin
VCOC/RIN3 pin
INR1-0 bits
MDIF2 bit ^MIC-Amp
ADC Rch
These blocks are not
available at PLL mode.
MS0477-E-01
Lineout, Receiver-Amp, HP-Amp
Figure 40. Analog Mixing Circuit
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2006/10