AK4649 Datasheet, PDF (34/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK-AMP

[AK4649]
■ MIC/LINE Input Selector
The AK4649 has an input selector. INL and INR bits select LIN1/LIN2 and RIN1/RIN2, respectively. When DMIC bit =
“1”, digital microphone input is selected regardless of INL and INR bits.
DMIC bit
0
1
INL bit
0
0
1
1
0
0
1
1
INR bit
Lch
Rch
0
LIN1
RIN1
1
LIN1
RIN2
0
LIN2
RIN1
1
LIN2
RIN2
0
1
Digital MIC
0
1
Table 20. MIC/Line In Path Select
(default)
■ MIC Gain Amplifier
The AK4649 has a gain amplifier for microphone input. The gain of MIC-Amp is selected by the MGAIN3-0 bits (Table
21). The typical input impedance is 30kΩ (typ).
MGAIN3 bit
0
0
0
0
0
0
0
0
1
1
1
MGAIN2 bit MGAIN1 bit MGAIN0 bit Input Gain
0
0
0
0dB
0
0
1
+20dB
0
1
0
+26dB
0
1
1
N/A
1
0
0
+9dB
1
0
1
+16dB
1
1
0
+23dB
1
1
1
+29dB
0
0
0
+3dB
0
0
1
+6dB
0
1
0
+12dB
Others
N/A
Table 21. Input Gain (N/A: Not available)
(default)
MS1023-E-01
- 34 -
2010/08