AK4650 Datasheet, PDF (26/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
■ MIC Input Selector
AK4650 has mic input selector in front of mic amp. MSEL bit selects internal or external mic (Figure 17). When MDIF bit
= “1”, INT and EXT pins become MIC− and MIC+ pins, respectively, and differential input is available (Figure 18).
MDIF bit MSEL bit
Selector
0
0
INT
(default)
1
EXT
1
x
Differential
Table 9. MIC Input Selector (x: Don’t care)
MPE pin
MPI pin
AK4650
INT pin
EXT pin
MDT pin
MIC-Amp
500k _0.2V(typ)
DTMIC bit
Figure 17. MIC Input (MDIF bit = “0”: Single-ended Input)
MPI pin
AK4650
MIC− pin
MIC+ pin
MIC-Amp
Figure 18. MIC Input (MDIF bit = “1”: Differential Input)
Note 39. In case of differential input, MGAIN bit should be set to “1”.
Maximum input voltage of each input pin is | (MIC+) − (MIC−) | = 0.198Vpp(typ)@AVDD=3.3V.
MS0502-E-01
- 26 -
2007/04