AK4953A Datasheet, PDF (34/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4953A]
■ MIC/LINE Input Selector
The AK4953A has an input selector. INL1-0 and INR1-0 bits select LIN1/LIN2 /LIN3 and RIN1/RIN2/RIN3,
respectively. When DMIC bit = “1”, digital microphone input is selected regardless of INL and INR bits.
DMIC bit
0
1
INL1 bit INL0 bit INR1 bit INR0 bit
Lch
Rch
0
0
0
0
LIN1
RIN1
0
0
0
1
LIN1
RIN2
0
0
1
0
LIN1
RIN3
0
1
0
0
LIN2
RIN1
0
1
0
1
LIN2
RIN2
0
1
1
0
LIN2
RIN3
1
0
0
0
LIN3
RIN1
1
0
0
1
LIN3
RIN2
1
0
1
0
LIN3
RIN3
Others
N/A
N/A
x
x
x
x
Digital Microphone
Table 21. MIC/Line In Path Select (x: Don’t care, N/A: Not available)
(default)
■ MIC Gain Amplifier
The AK4953A has a gain amplifier for microphone input. The gain of MIC-Amp is selected by the MGAIN3-0 bits
(Table 22). The typical input impedance is 30kΩ.
MGAIN2 bit
0
0
0
0
1
1
1
MGAIN1 bit MGAIN0 bit Input Gain
0
0
0dB
0
1
+12dB
1
0
+16dB
1
1
+20dB
0
0
+23dB
0
1
+26dB
1
0
+29dB
Others
N/A
Table 22. Input Gain (N/A: Not available)
(default)
MS1252-E-00
- 34 -
2010/10