Evaluation Kit Hardware
SAM4S-EK2 User Guide
4-10
11176A–ATARM–24-Sep-12
Figure 4-12. Microphone Input
4.3.10.2 Headphone Output
The SAM4S-EK2 evaluation kit supports mono/stereo audio playback driven by a TPA0223 audio ampli-
fier connected to two DAC channels of the microcontroller.
The TPA0223 is a 2W mono Bridge-Tied-Load (BTL) amplifier designed to drive speakers with as low as
4 Ohm impedance. The amplifier can be reconfigured on the fly to drive two stereo Single-Ended (SE)
signals into head phones.
Figure 4-13. Headphone Output
R7 5
47 K
C7 4
10 0nF
C7 7
4.7 uF
R8 3
0R
R9 1
0R
AG ND
DG ND
JP14 and JP15 should be set
or removed together
R9 0
10 0K
R7 6
47 K
AV DD
R9 3
10 0K
JP 15
He ade r2
C7 2
1n F
AG ND
AG ND
VCC3 3
C6 9
1n F
AG ND
R7 7
47 0R
PB 0
R8 6
47 K
AG ND
MIC1
SV B6 050
1
2
MN11
TS 922
IN1-
2
IN1+
3
OUT2
7
IN2-
6
IN2+
5
GND
4
VCC
8
OUT1
1
FB 2
BN03K 31 4S3 00R
AV DD
R7 9
1K
JP 14
He ade r2
R8 7
47 K
R8 1
10 0R
AV DD
AUDIO IN
C7 1
22 nF
AG ND
R8 2
1K
R7 8
1K
R8 0
1K
R8 4
1K
R8 5
1K
R8 8
47 0R
C6 2
10 0pF
C6 3
22 uF
C7 3
22 uF
C6 7
1u F
C6 8
1u F
AG ND
AG ND
AG ND
R1 00
33 K
J1 1
Ph one jack Ste reo 3.5
5
4
3
2
1
+
C8 3
22 0uF-TA N-6 .3V
+
C8 1
22 0uF-TA N-6 .3V
R9 7
1K
R9 5
1K
R1 04
47 K
C8 6
0.4 7uF
AG ND
AG ND
AUDIO OUT
C7 9
1u F
JP 29
1
2
3
AUDIO _O UTL
C8 2
10 0nF
DG ND
TP 12
Te st P ad S Q-4 0TH
R1 05
33 K
C8 4
0.4 7uF
C8 8
0.4 7uF
MN13
TP A02 23DGQ
VDD
3
RIN
5
MO NO -IN
1
LIN
9
LO /MO -
10
RO /MO +
6
ST/MN
7
SHUTD0WN
2
BY PA SS
4
GND
8
PA
D
11
+
C8 0
10 uF
C8 5
0.4 7uF
JP 17
He ade r2
JP 19
He ade r2
VDD_ AMP
R1 03
10 0K
R1 01
10 0K
R1 02
10 0K
AG ND
JP 20
He ade r2
AG ND
AG ND
VDD_ AMP
PB 13
C8 7
1u F
J1 0
1
2
+5 V
R9 8
33 K
AG ND
R9 9
47 K
FB 3
BN03K 31 4S3 00R
VCC3 3
AG ND
