Datasheet

[AK4646]
MS0557-E-06 2011/06
- 30 -
■ 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 INL bit INR bit Lch Rch
0 LIN1 RIN1 (default)
0
1 LIN1 RIN2
0 LIN2 RIN1
0
1
1 LIN2 RIN2
0 x LIN1(Note 34)
IN2+/−
0
1
1 x N/A N/A
0 N/A N/A
0 x
1
IN1+/−
RIN2(
Note 35)
1
1 x x
IN1+/− 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
LIN1/IN1
−
pin
A
DC Lch
RIN1/IN1+ pin
INL bit
MDIF1 bit
RIN2/IN2
−
pin
A
DC Rch
LIN2/IN2+ pin
INR bit
MDIF2 bit
AK4646
Figure 21. Mic/Line Input Selector
INx− pin
INx+ pin
MPWR pin
A
K4646
MIC-Amp
1k
1k
R1
R2
Figure 22. Connection Example for Full-differential Mic Input (MDIF1/2 bits = “1”)