AK4533 Datasheet, PDF (37/40 Pages) Asahi Kasei Microsystems – Audio Codec with Touch Screen Controller

[ASAHI KASEI]
„ System Diagram
Figure 23shows the system diagram. VA and VD should be powered at the same time, or VA should be powered earlier than VD. In order to achieve this sequence, VD is supplied from VA via
10 Ω resistor as shown in Figure 23. The voltage should not be supplied to the input pins including TPVREFIN, BTI_1, and BTI_2 before VA and VD are powered.
Analog
VA=3.0V
4.7uF
+
4.7uF
0.1uF
+
4.7uF
0.1uF
+
4.7uF
0.1uF ⁺
10Ω
0.1uF
AGND2
AGND1
VB
1nF
AFILT
+
VCOM
4.7uF
0.1uF
VA
MIC
+
4.7uF
0.1uF
AMP
1uF
1uF
1uF
47k
47k
VCOMAD
MICIN
MICOUT
AIN
LOUT
ROUT
VA2
VA1
VD
DGND
TPX_TOP
TPX_BTM
TPY_TOP
TPY_BTM
TPVREFIN
BTI_1
BTI_2
Touch
Screen
Processor/Gate Array
Figure 23. The AK4533 System Diagram
<Revision 0.9a>
36
July 00