ak4644 AKM Semiconductor, Inc., ak4644 Datasheet - Page 61

• Manufacturer Part Number: ak4644
• Description: Stereo Codec With Mic/hp/rcv-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
<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”.
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”.
MS0477-E-01
LIN2 pin
LIN1 pin
RIN2 pin
RIN1 pin
LIN3 pin
RIN3 pin
LIN2 pin
MIN pin
RIN2 pin
MIN pin
Figure 57. HPL Mixing Circuit (AIN3 bit = “0”, HPG bit = “0”)
Figure 58. HPR Mixing Circuit (AIN3 bit = “0”, HPG bit = “0”)
Figure 59. HPL Mixing Circuit (AIN3 bit = “1”, HPG bit = “0”)
Figure 60. HPR Mixing Circuit (AIN3 bit = “1”, HPG bit = “0”)
MIC-Amp Lch
MIC-Amp Rch
DAC Rch
DAC Lch
DAC Rch
DAC Lch
MICR3 bit
MICL3 bit
− 20dB
− 20dB
0dB
0dB
0dB
0dB
- 61 -
*These blocks are not
available at PLL mode.
*These blocks are not
available at PLL mode.
0dB
0dB
0dB
0dB
0dB
0dB
RINH2 bit
LINH2 bit
DACH bit
DACH bit
MINH bit
MINH bit
RINH2 bit
RINH3 bit
LINH2 bit
LINH3 bit
DACH bit
DACH bit
M
M
X
X
I
I
M
M
X
X
I
I
HPL pin
HPR pin
HPL pin
HPR pin
[AK4644]
2006/10