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Evaluation Kit Hardware
Figure 4-11. JTAG Interface
+ 3 V 3
R 3 9
R40
R41
R42
R4 3
100K
100K
100K
100K
100K
J6
PB4
PB6
PB7
PB5
NR S T
R44
0R
1
3
5
7
9
11
1 3
15
17
19
VTref V su pply
nTR S T GND1
TDI GND2
TM S GND 3
TCK GND4
RTCK GND5
TDO GND6
n S R S T GND7
DBGRQ GND 8
DBGACK GND9
2
4
6
8
10
12
14
16
1 8
20
DGND
4.3.10
Audio Interface
The SAM3S–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).
4.3.10.1 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).
SAM3S-EK Development Board User Guide
4-9
11031C–ATARM–30-Mar-11
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