ak4648 AKM Semiconductor, Inc., ak4648 Datasheet - Page 59

• Manufacturer Part Number: ak4648
• Description: Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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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 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”, 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 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.
MS0625-E-01
Analog Mixing: Stereo Input (LIN2/RIN2/LIN4/RIN4, AIN3 bit = “1”: LIN3/RIN3 pins)
RIN3
LIN3
Pin
RIN2
RIN4
LIN2
LIN4
Pin
PMAINL3 bit
PMAINR3 bit
0
1
1
PMAINL2 bit
PMAINR2 bit
PMAINL4 bit
PMAINR4 bit
Table 41. Input Impedance of LIN3/RIN3 pins (AIN3 bit = “1”; x: Don’t care)
0
1
Table 40. Input Impedance of LIN2/RIN2/LIN4/RIN4 pins
PMMICR or PMADR bit
PMMICL or PMADL bit
PMMICR or PMADR bit
PMMICR or PMADR bit
PMMICL or PMADL bit
PMMICL or PMADL bit
1
0
1
1
0
1
bit
bit
- 59 -
MICL3 bit
MICR3 bit
x
0
0
1
MGAIN1-0 bits
01, 10 or 11
01, 10 or 11
01, 10 or 11
00
00
00
MGAIN1-0 bits
01, 10 or 11
01, 10 or 11
01, 10 or 11
01, 10 or 11
00
00
00
00
Input Impedance
Input Impedance
(typ.)
60k
30k
60k
30k
30k
20k
(typ.)
60k
30k
60k
30k
30k
20k
60k
30k
[AK4648]
2007/06