AK4673 Datasheet, PDF (67/107 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP and Touch Screen Controller

AK4673
HPL pin
HPR pin
Headphone
[AK4673]
Another
HP-Amp
Figure 57. Wired OR with External HP-Amp
<Analog Mixing Circuit for Headphone Output>
When AIN3 bit = “0”, DACH, MINH, LINH2, RINH2, LINH4 and RINH4 bits controls each path switch.
MIN path mixing gain is −20dB(typ)@HPG bit = “0” when the external input resistance is 20kΩ.
LIN2, RIN2, LIN4, RIN4 and DAC pathes mixing gain is 0dB(typ)@HPG bit = “0”.
LINH2 bit
LIN2 pin
0dB
LIN4 pin
MIN pin
LINH4 bit
0dB
M
MINH bit
I
−20dB
X
HPL pin
DAC Lch
DACH bit
0dB
Figure 58. HPL Mixing Circuit (AIN3 bit = “0”, HPG bit = “0”)
RIN2 pin
RINH2 bit
0dB
RIN4 pin
MIN pin
RINH4 bit
0dB
M
MINH bit
I
−20dB
X
HPR pin
DAC Rch
DACH bit
0dB
Figure 59. HPR Mixing Circuit (AIN3 bit = “0”, HPG bit = “0”)
MS0670-E-00
- 67 -
2007/09