Datasheet
national.com
© National Semiconductor Corporation 2009 Printed in U.S.
8
CW
VR2
SVR100_open
1 3
2
+
C8
10uF_open
12
R4182.5oh penm_o
VDDHSc
JP2
1
2
3
VSS
+
C16
0.1uF
12
+
C9
10uF_open
12
R43
100ohm_open
VDD
+
C15
2.2uF
12
VSS
J3
BANANA
1
+
C13
22uF
12
VSS
VSS
DIRECT
1.8V INPUT
POWER
CONNECTOR
VDD
JP1
12
1.8V
J5
2x4 pin Jumper_open
2
4
6
8
1
3
5
7
VDD3.3V
VSS
CW
VR1
SVR100_open
1 3
2
VSS
U3
LM1117IMP-ADJ/SOT223_open
ADJ/GND
1
INPUT
3
OUTPUT
2
Tab/Vout
4
3.3V
VDDTXc
VDDI
VDDI
VDD
VDD3.3V
!!!WARNING!!!
Input power thru J2 OR J3 OR J4
ONLY!!
Input power thru only one connector!!
VDDPc
VDDIc
VDDIc
VDDPc
OPTIONAL
5V to 3.3V
INPUT POWER
REGULATOR
OPTIONAL
5V to 1.8V
INPUT POWER
REGULATOR
OPTIONAL
5V INPUT POWER
CONNECTOR
U2
LM1117IMP-ADJ/SOT223_open
ADJ/GND
1
INPUT
3
OUTPUT
2
Tab/Vout
4
VDD
VDD
VSS
VDD
Place near pin 7 of U1
Place near pin 14 of U1
C28
0.1uF
C27
0.01uF
+
C31
22uF
12
C24
0.1uF
C25
0.01uF
+
C17
22uF
12
C23
0.1uF
C26
0.01uF
+
C18
22uF
12
C20
0.1uF
C19
0.01uF
+
C21
22uF
12
Place near pin 17 of U1
Place near pin 30 of U1
Place near pin 22 of U1
VDDIO=VDD (1.8V)
VDDIO=3.3V (external)
OPTIONAL External 3.3V input.
VSS
VSS
VSS
VSS
+
C32
22uF
12
VDDLc
VDD
C29
0.01uF
VDDLc
C30
0.1uF
R56
0 Ohm,0402
VSS
VDDHSc
VDDTXc
VSS
+
C1
2.2uF
12
+
C10
22uF
12
+
C2
0.1uF
12
+
C3
10uF_open
12
+
C4
10uF_open
12
Tit le
Size Document Number Rev
Date: Sheet
of
DS92LV2421 Tx Demo Board 2
DS92LV2421 Tx Demo Board - Power and Decoupling
44Tuesday , May 18, 2010
R4282.5ohm_open
VSS
VSS
R53
0 Ohm,0402
VDD3.3V
J2
CONN JACK PWR_open
3
2
1
R46
0 Ohm,0402
R47
0 Ohm,0402
R48
0 Ohm,0402
J4
BANANA
1