AK8157A Datasheet, PDF (22/26 Pages) Asahi Kasei Microsystems – Multiclock Generator for Premium Audio Device

10. Recommended External Circuits
PM-IC
VDD = 1.8V
[AK8157A]
C1 : 0.1F
Control
CAD1
CAD0
SCL
SDA
RSTN
C1
C1
CAD1 VDD2
VSS1
CLK
IN
D
VDD3
SDA
SCL
CAD0 ^C
C1
AK8157A
VSS2 RSTN LRCK VDD1 B
(Top view)
BCLK VDD4 VSS3 MCLK A
4
3
2
1
C1
CLKIN Input
9.6MHz
LRCK Output
BCLK Output
MCLK Output
Figure 20. Recommended External Circuits
PCB Layout Consideration
The AK8157A is a high-accuracy and low-jitter clock generator. For proper performances specified in this
datasheet, careful PCB layout should be taken. The followings are layout guidelines based on the typical
connection diagram shown in Figure 20.
Power supply line & Ground pin connection
The AK8157A has four power supply pins (VDD1, VDD2, VDD3 and VDD4) which deliver power to internal
circuitry segments, and it has three ground pins (VSS1-3). These pins require connecting to ground plane
which will eliminate any common impedance with other critical switching signal return.
0.1F decoupling capacitors placed at VDD1, VDD2, VDD3 and VDD4 should be grounded at close to the
VSS1, the VSS2 and VSS3, respectively.
015002776-E-00
- 22 -
2015/03