AK4561 Datasheet, PDF (30/48 Pages) Asahi Kasei Microsystems – 16bit CODEC with built-in ALC and MIC/HP-Amp

ASAHI KASEI
AKM CONFIDENTIAL
[AK4561]
FUNCTION DETAIL
n MIC BLOCK
MIC block includes 2-inputs selectors, Internal MIC or External MIC Mode can be selected by S0 bit. (Refer to Figure 11
and Figure 12)
When Internal MIC is selected, the phase of HPF-Amp is inverted.
INT_MIC_L
EXT_MIC_L
S0
-
+
S0 ^{Pre Amp}
-
+
Inv Amp
-
S1
+
EQ
EQ Amp EXT
S0
S1
+
-
HPF
To ALC
From Rch
To Rch
Figure 11. Internal path at selecting Internal MIC Mode (HPF OFF)
INT_MIC_L
EXT_MIC_L
S0
-
+
S0 ^{Pre Amp}
-
+
Inv Amp
-
S1
+
EQ
EQ Amp EXT
S0
S1
+
-
HPF
To ALC
From Rch
To Rch
Figure 12. Internal path at selecting External MIC Mode (HPF OFF)
Rev. 0.9
- 30 -
2000/09