[AK4685]
SYSTEM DESIGN
Figure 28 shows the system connection diagram. An evaluation board is available which demonstrates application
circuits, the optimum layout, power supply arrangements and measurement results.
Analog in1
Headphone
6.8 6.8
Ri
Rf
Ri
Rf
Ri
Rf
Ri
Rf
10u
+
+
+
10u
2.2u
10u
0.1u
0.1u
10u
+
49 RVCOM1
50 RIN1+
VSS4 32
PVDD 31
CN 30
3.3V Analog
Rf
Rf
Ri
Ri
0.1u
RIN1-
51
52
2.2u
RAMPO1
CP 29
Analog in2
53 LAMPO1
54 LIN1-
NC 28
Rf
Rf
Ri
Ri
Diff to single
LOUT- 27
LOUT+ 26
ROUT- 25
ROUT+ 24
VSS3 23
AVDD2 22
SGL 21
Mute
circuit
circuit
55 LIN1+
Analog out
Diff to single
circuit
Mute
56 LVCOM1
57 LRCKB
58 BICKB
59 SDTOB2
60 SDTOB1
61 MCKO
62 TVDD
circuit
AK4685
10u
+
5V Analog
0.1u
LRCKA 20
MCLKA 19
BICKA 18
SDTIA 17
10u 0.1u
+
3.3V Digital
5V Digital
63 VSS7
+
64 DVDD1
0.1u
10u
0.1u
0.1u
10u
10u
+
+
X’tal
C
Audio DSP2
Micro
Controller
Figure 28. Typical Connection Diagram (Master Mode)
Notes:
- VSS1-7 must be connected the same analog ground plane.
MS1106-E-00
2009/08
- 48 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
