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Evaluation Kit Hardware
SAM4S-EK Development Board User Guide
4-9
11139A–ATARM–29-Nov-11
Figure 4-11.
JTAG Interface
4.3.15
Audio Interface
The SAM4S-EK board supports both audio recording and playback.
The audio volume can be adjusted using the potentiometer RV1, and the microphone amplifier gain can
be adjusted via jumpers (fixed gain of 24 or 26
dB).
4.3.16
Microphone Input
The embedded microphone is connected to an audio pre-amplifier using the TS922 operational amplifier
(MN11). The gain is set by using JP14 and JP15 jumpers; both must be set or removed at the same
time.
By modifying the jumper positions, you can select each of the following gain values:
20
dB (default setting, both JP14 and JP15 are off)
26
dB (both JP14 and JP15 are on).
Note:
3.
The TB1 series 0 Ohm resistor is a reservation for future impedance adaptation facility.
Under specific amplifier settings conditions, this enables the easy insertion of a capaci-
tor or any other bipolar device on the audio path. On the other hand, R83 is a default
0
Ohm resistor that enables the disconnection of PB0 from the audio input path for cus-
tom usage.
4.
The audio pre-amplifier MN11 is powered by a dedicated low dropout regulator
MIC5219-3.3 (MN14).
+3V3
DGND
NRST
PB5
PB7
PB6
PB4
R43
100K
R43
100K
R41
100K
R41
100K
R39
100K
R39
100K
J6
J6
VTref
1
Vsupply
2
nTRST
3
GND1
4
TDI
5
GND2
6
TMS
7
GND3
8
TCK
9
GND4
10
RTCK
11
GND5
12
TDO
13
GND6
14
nSRST
15
GND7
16
DBGRQ
17
GND8
18
DBGACK
19
GND9
20
R42
100K
R42
100K
R40
100K
R40
100K
R44
0R
R44
0R