EVAL-ADuCM350EBZ User Guide
UG-668
Rev. A | Page 21 of 28
Figure 20 is a reference schematic both for the beeper/piezoelectric buzzer setup and for the I
2
S setup using the
SSM2518
.
Figure 20. Audio Schematic
Ext PVD
GND
C1
0.1uF
18
GND
19
GND
20
PVDD
1
OUTL+
2
OUTL-
3
ADDR
4
SDA
5
SCL
6
MCLK
7
BCLK
8
GND
9 LRCLK
10
SDATA
11
SAMOD
12
DVDD
13 /SD
14
OUTR-
15
OUTR+
16
PVDD
17
GND
U2
SSM2518CPZ
R2
0r
R1
0r
OUTPUT1-1
OUTPUT1-2
OUTPUT2-1
OUTPUT2-2
C2
4.7uF
B
A
LK2
R9
10K
R3
2K2
2K2
R4
J2-1
J2-2
B
A
LK3
C3
0.1uF
SDA
SCL
BMCLK
SDATA
LRCLK
SELECTOR
SELECTOR
SELECTOR
PVDD
PVDD
BUZZER
D1
PKLCS1212E4001
1 A1
2 C1
4
A2
3
AC2
5
C2
6
AC1
U5
DIODE-BAS40DW-04
BEEP
BEEP
VDD
I2S DAC/DRIVER
BEEPER
AUDIO SELECTOR
For Beeper M2 = A
For I2S M2 = B
For I2C M2 = B
6 VDD
7
S2B
8
D2
9
S2A
3
S1B
4 IN1
2 D1
5
IN2
1 S1A
10
GND
U4
ADG772BCPZ
C6
0.1uF
C7
0.1uF
1
2
D1
S1B
3
VS
S
4
G
N
D
5 S2B
6 D2
7 S2A
8 IN2
9
IN3
10
N
C
11
S3A
12
D3
13
S3B
14
VDD
15
S4B
16
D4
17
S4A
18
IN4
19 IN1
20 S1A
U1
ADG788
B
A
LK4
VDD
DGND
P3.12
BMCLK
BEEP
P3.13
SDATA
BEEP
LRCLK
P3.14
VDD
DGND
P4.0
P4.1
SCL
SDA
VDD
DGND
SELECTOR
12104-
010
