Datasheet

Revision 1.5 Page 37 of 41
nRF905 Product Specification
15.3 Single ended connection to 50Ω antenna
Figure 14. 433 MHz operating nRF905 application schematic, single ended connection to 50 Ω antenna by
using a differential to single ended matching network
Figure 15. 868-915 MHz operating nRF905 application schematic, single ended connection to 50
Ω
antenna by using a differntial to single ended matching network
C2
22pF
C6
4.7nF
C5
33pF
R2
22K
C7
10nF
VDD
C1
22pF
R1
1M
X1
16 MHz
TRX_ C E
1
VSS
24
VSS
18
VDD
17
VSS
16
PWR_UP
2
uPCLK
3
VDD
4
VSS
5
CD
6
AM
7
DR
8
VSS
9
MI SO
10
MO S I
11
SCK
12
XC2
15
XC1
14
CSN
13
VDD_PA
19
ANT1
20
ANT2
21
VSS
22
IR EF
23
nRF905
VDD
25
VSS
26
VSS
27
VSS
28
VSS
29
VSS
30
DVDD_1 V2
31
TXEN
32
U1
nRF905
VDD
L1
C3
C11
Op t ion al
C12
L3
L2
C9
C10
C4
3.3nF
C8
33pF
VDD
C13
Opt ion al
C12
C13
L1
L2
L3
33pF, ±5%
Optional
12nH, 5%
12nH, 5%
12nH, 5%
6.8pF, ±5%
Optiona l
12nH, 5%
39nH, 5%
39nH, 5%
50 ohm RF I/O
TXEN
TRX_ CE
PWR_UP
CD
AM
DR
SPI_MISO
SPI_MOSI
SPI_SCK
SPI_C SN
uPCLK
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