AK4648 Datasheet, PDF (59/119 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP

[AK4648]
■ 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 LINS2 and RINS2 bits are set to “1”, the input signal from the LIN2/RIN2 pins is output from Speaker-Amp. When
the LINH2 and RINH2 bits are set to “1”, the input signal from the LIN2/RIN2 pins is output from Headphone-Amp.
When the LINL2/RINR2 bits are set to “1”, the input signal from the LIN2/RIN2 pins is output from 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 LINS4 and RINS4 bits are set to “1”, the input signal from the LIN4/RIN4 pins is output from Speaker-Amp. When
the LINH4 and RINH4 bits are set to “1”, the input signal from the LIN4/RIN4 pins is output from Headphone-Amp.
When the LINL4/RINR4 bits are set to “1”, the input signal from the LIN4/RIN4 pins is output from 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 becomes 30kΩ (typ.) at MGAIN1-0 bits = “00” and 20kΩ (typ.) at MGAIN1-0
bits = “01”, “10” or “11”, respectively.
Pin
LIN2
RIN2
LIN4
RIN4
bit
PMAINL2 bit PMMICL or PMADL bit
PMAINR2 bit PMMICR or PMADR bit
PMAINL4 bit PMMICL or PMADL bit
MGAIN1-0 bits
PMAINR4 bit PMMICR or PMADR bit
0
1
00
01, 10 or 11
1
0
00
01, 10 or 11
1
00
01, 10 or 11
Table 40. Input Impedance of LIN2/RIN2/LIN4/RIN4 pins
Input Impedance
(typ.)
60k
30k
60k
30k
30k
20k
When AIN3 bit = “1”, 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 LINS3 and RINS3 bits are set to “1”, the input signal from the LIN3/RIN3 pins is output from
Speaker-Amp. When the LINH3 and RINH3 bits are set to “1”, the input signal from the LIN3/RIN3 pins is output from
Headphone-Amp. When the LINL3/RINR3 bits are set to “1”, the input signal from the LIN3/RIN3 pins is output from
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.
Pin
LIN3
RIN3
PMAINL3 bit
PMAINR3 bit
bit
PMMICL or PMADL bit
PMMICR or PMADR bit
MICL3 bit
MICR3 bit
Input Impedance
MGAIN1-0 bits
(typ.)
0
1
x
00
60k
01, 10 or 11
30k
1
0
0
00
01, 10 or 11
60k
30k
1
1
0
00
01, 10 or 11
30k
20k
1
00
01, 10 or 11
60k
30k
Table 41. Input Impedance of LIN3/RIN3 pins (AIN3 bit = “1”; x: Don’t care)
MS0625-E-01
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2007/06