AK4641 Datasheet, PDF (31/51 Pages) Asahi Kasei Microsystems – 16 BIT CODEC WITH BLUETOOTH INTERFACE

ASAHI KASEI
[AK4641]
„ STEREO LINE OUTPUT (LOUT and ROUT pins) and MONO LINE OUTPUT (MOUT2 pin)
DAC of
Mono CODEC
Mic In
DAC2 bit
ATT
0dB/+20dB
IPGA
ATT +
DAC of Stereo CODEC
DACL bit
MICL bit
Stereo Line Out
External Headphone Amp
AUX In
AUXL bit
External Speaker Amp
Mono Line Out(MOUT2)
Volume
Figure 28. Stereo Line Output and Mono Line Out2
Line out path does not have volume but the attenuator of DAC of Stereo CODEC, volume of Mic In and AUX In control
the output signal level. The AK4641 does not have mute circuits to remove pop noise at power up and down for Line
Output. The signal of the stereo mixer is converted to a mono signal [(L+R)/2] and this signal is output via MOUT2 pin.
„ MONO LINE OUTPUT (MOUT+/MOUT− pin)
MIC In
DAC of
Mono CODEC
DAC2 bit
ATT
0dB/+20dB
IPGA
ATT +
DAC of Stereo CODEC
DACM bit
1/2
1/2
MICM bit
MOGN bit
−17dB/+6dB
Figure 29. Mono Output
MOUT+
MOUT−
Mono mixer mixes signal from MIC In, Lch signal and Rch signal from DAC of Stereo CODEC. This mixed signal is
output from the MOUT+ and MOUT− pins by differential output. Amp for mono output has 6dB gain and −17dB gain
that are set by the MOGN bit.
MS0301-E-00
- 31 -
2004/05