[AK4646]
■ MIC/LINE Input Selector
The AK4646 has an input selector. When MDIF1 and MDIF2 bits are “0”, INL and INR bits select LIN1/LIN2 and
RIN1/RIN2, respectively. When MDIF1 and MDIF2 bits are “1”, LIN1, RIN1, LIN2 and RIN2 pins become IN1−, IN1+,
IN2+ and IN2− pins respectively. In this case, full-differential input is available (Figure 22).
MDIF1 bit
MDIF2 bit
0
INL bit
0
INR bit
Lch
LIN1
LIN1
LIN2
LIN2
Rch
RIN1
RIN2
RIN1
RIN2
IN2+/−
N/A
N/A
0
1
0
1
x
x
0
1
x
(default)
0
1
0
1
LIN1(Note 34)
N/A
1
N/A
IN1+/−
IN1+/−
0
1
x
1
RIN2(Note 35)
x
IN2+/−
Note 34. Any signal should be input to RIN1 pin, when MDIF1 bit = “0”, MDIF2 bit = “1” and INL bit = “0”.
Note 35. Any signal should be input to LIN2 pin, when MDIF1 bit = “1”, MDIF2 bit = “0” and INL bit = “1”.
Table 18. MIC/Line in Path Select
AK4646
INL bit
LIN1/IN1− pin
ADC Lch
RIN1/IN1+ pin
MDIF1 bit
INR bit
RIN2/IN2− pin
ADC Rch
LIN2/IN2+ pin
MDIF2 bit
Figure 21. Mic/Line Input Selector
AK4646
MPWR pin
1k
1k
R1
R2
MIC-Amp
INx− pin
INx+ pin
Figure 22. Connection Example for Full-differential Mic Input (MDIF1/2 bits = “1”)
MS0557-E-05
2011/01
- 30 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
