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Figure 4-17. ADC/AFE input.
+3V3
VR1
10K VR
CN2
BNC
R76
49.9R
CN3
BNC
C71
4.7nF DNP
CN4
BNC
C74
4.7nF DNP
4.3.16.3
Analog output
The BNC connector CN1 is connected to the DAC port PB14 and provides an external analog output. An on-board 50Ω
resistor termination can be enabled by closing jumper JP21. A filter can be implemented on this output channel by
replacing R74 and C69 with appropriate resistor and capacitor values, depending on the application requirements.
Figure 4-18. DAC output.
CN1
BNC
ADC / AFE
Potentiometer
Clockwise 2-->3
2
C68
10nF
2
JP40
JP20
C70
10nF
JP21
2
JP23
R77
49.9R
JP24
2
JP26
R79
49.9R
R74
0R
C69
2.2uF
JP19
R75
49.9R
(AFE0_AD5)
PB1
PB0
(AFE0_AD4)
PB2
(AFE1_AD0, need open JP41)
JP22
2
L3 220uH
C72
C73
R78
680pF
680pF
600R
L4
220uH
JP25
2
JP18
PB14
2
DAC1
PC30
(AFE0_AD10)
PC31
(AFE0_AD11)
SAM4E-EK User Guide
42067B−SAM4E−04/2013
19
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