Datasheet
national.com
© National Semiconductor Corporation 2009 Printed in U.S.
6
VDD3.3V
JP21
1
2
3
VDDIO=VDD (1.8V)
VDD
VDDIO=3.3V (external)
+
C8
10uF_open
12
R1082.5ohm
VDDI
VDD3.3V
JP3
1
2
3
VDD
VDDIO=3.3V (external)
VDDIO=VDD (1.8V)
VDD3.3V
Place near pin 6 of U1
Place near pin 38 of U1
VDDA1
JP2
1
2
3
VSS
+
C15
0.1uF
12
R12
100ohm_open
VDD
+
C14
2.2uF
12
VSS
J4
BANANA
1
+
C13
22uF
12
Place near pin 8 of U1
VSS
VSS
1.8V INPUT
POWER
CONNECTOR
VDDTX
Place near pin 13 of U1
VDDTX
JP1
12
VDD1.8V
VDDTXc
C7
0.1uF
J6
2x4 pin Jum per_open
2
4
6
8
1
3
5
7
C6
0.01uF
VSS
R6
0 Ohm, 0402
OPTIONAL External 3.3V input.
VSS
VDD3.3V
CW
VR1
SVR100_open
1 3
2
VSS
R1182.5ohm
U3
LM1117IM P-ADJ/SOT223_open
ADJ/GND
1
INPUT
3
OUTPUT
2
Tab/Vout
4
3.3V
Place near pin 31 of U1
VDDL2
+
C2
10uF_open
12
VDDL2
C19
0.1uF
C20
0.01uF
VSS
R20
0 Ohm, 0402
+
C9
10uF_open
12
VDD
+
C1
10uF_open
12
VDD
!!!WARNING!!!
Input power thru J5 OR J4 OR JP3 OR J9
ONLY!!
Input power thru only one connector!!
CW
VR2
SVR100_open
1 3
2
VDDL1
VDDIO
VDDL1
OPTIONAL
5V to 3.3V
INPUT POWER
REGULATOR
OPTIONAL
5V to 1.8V
INPUT POWER
REGULATOR
VDDIO
VSS
OPTIONAL
5V INPUT POWER
CONNECTOR
VDDP
U2
LM1117IMP-AD J/SOT223_open
ADJ/GND
1
INPUT
3
OUTPUT
2
Tab/Vout
4
VDD
VDD
VDD3.3V
JP20
1
2
3
VDDIO=3.3V (external)
VDDIO=VDD (1.8V)
Place near pin 25 of U1
VDDIO=3.3V (external)
VDDIO=VDD (1.8V)
VSS
VDDPc
Place near pin 43 of U1
VDDA2
VDDA2
VDDA2c
C23
0.1uF
C25
0.01uF
VSS
R22
0 Ohm, 0402
VDD
VDD3.3V
JP22
1
2
3
VDDIO=3.3V (external)
VDDIO=VDD (1.8V)
Place near pin 47 of U1
VDDSC2
VDDSC2
VDD
C24
0.1uF
C29
0.01uF
C32
0.1uF
C28
0.01uF
VSS
R28
0 Ohm, 0402
C21
0.1uF
C22
0.01uF
+
C16
22uF
12
C31
0.1uF
C27
0.01uF
C17
0.1uF
C18
0.01uF
VSS
VSS
VSS
VDDSC1
VDD
Place near pin 46 of U1
C26
0.01uF
VDDSC1
C30
0.1uF
R26
0 Ohm, 0402
VDDA1
VDDP
VSS
+
C34
22uF
12
+
C11
2.2uF
12
+
C10
22uF
12
+
C12
0.1uF
12
Tit le
Size Document Num ber Rev
Date: Sheet
of
Rx Demo Board A
Rx Demo Board - Power and Decoupling
44Monday , August 10, 2009
VSS
VSS
VSS
R29
0 Ohm, 0402
VDD3.3V
R21
0 Ohm, 0402
J7
CONN JACK PWR_open
3
2
1
R27
0 Ohm,0402R23
0 Ohm, 0402
J5
BANANA
1
VSS