AK4644 Datasheet, PDF (61/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/RCV-AMP

ASAHI KASEI
[AK4644]
<Analog Mixing Circuit for Headphone Output>
When AIN3 bit = “0”, DACH, MINH, LINH2 and RINH2 bits controls each path switch.
MIN path mixing gain is −20dB(typ)@HPG bit = “0” when the external input resistance is 20kΩ.
LIN2, RIN2 and DAC pathes mixing gain is 0dB(typ)@HPG bit = “0”.
LINH2 bit
LIN2 pin
0dB
MIN pin
MINH bit
M
−20dB
I
HPL pin
DAC Lch
DACH bit X
0dB
Figure 57. HPL Mixing Circuit (AIN3 bit = “0”, HPG bit = “0”)
RIN2 pin
MIN pin
DAC Rch
RINH2 bit
0dB
MINH bit
M
−20dB
I
DACH bit X
0dB
HPR pin
Figure 58. HPR Mixing Circuit (AIN3 bit = “0”, HPG bit = “0”)
When AIN3 bit = “1”, DACH, LINH2, RINH2, LINH3, RINH3, MICL3 and MICR3 bits controls each path switch. All
pathes mixing gain is 0dB(typ)@HPG bit = “0”.
LINH2 bit
LIN2 pin
0dB
LIN3 pin
LIN1 pin
MICL3 bit
LINH3 bit
0dB
M
MIC-Amp Lch
I
*These blocks are not
available at PLL mode.
X
DACH bit
DAC Lch
0dB
HPL pin
Figure 59. HPL Mixing Circuit (AIN3 bit = “1”, HPG bit = “0”)
RIN2 pin
RIN3 pin
RIN1 pin
RINH2 bit
0dB
MICR3 bit
RINH3 bit
0dB
M
MIC-Amp Rch
DAC Rch
*These blocks are not
I
available at PLL mode.
X
DACH bit
0dB
HPR pin
Figure 60. HPR Mixing Circuit (AIN3 bit = “1”, HPG bit = “0”)
MS0477-E-01
- 61 -
2006/10