Si4421 reference designs, Evaluation board with 50 ohm matching network, Schematics – Silicon Laboratories SI4421 User Manual
Page 39: Tp 6 1, Tp 62, Frequency dependent component values, Recommended component types
Si4421
REFERENCE DESIGNS
Evaluation Board with 50 Ohm Matching Network
Schematics
CLK
_O
U
T
AR
SS
I
C8
C10
C9
C11
L1
L4
L2
L3
ANT
*
*
*
*
*
*
*
*
* See values in the table
*
optional
C3
C2
C4
C1
SDI
1
SCK
2
NSEL
3
SDO
4
NIRQ
5
FSK/DATA/NFFS
6
DCLK/CFIL/FFIT
7
NINT/VDI
16
XTL/REF
9
CLK
8
VSS
11
RF2
12
RF1
13
VDD
14
ARSSI
15
NRES
10
IC1
TP
6
1
CN62
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CN61
TP
62
Q6
1
MATCHING_NETWORK
VDD
GND
GND
ARSSI
ARSSI
RESET
RESET
SDI
SDI
SCK
SCK
SEL
SEL
SDO
SDO
IRQ
IRQ
DATA
DATA
DCLK
DCLK
VDI
VDI
10nF
GND
GND
GND
VD
D
VD
D
4.
7nF
GND
2.2uF
GN
D
IA4421
VD
D
GND
GND
VD
D
10M
Hz
GND
Frequency Dependent Component Values
f [MHz]
L1 [nH]
L2 [nH]
L3 [nH]
L4 [nH]
C8 [pF]
C9 [pF]
C10 [pF]
C11 [pF]
C3 [pF]
434 18
47
390 18 5 2.7
2.7
220
220
868
3.9
18 100 3.9 2.7 1.2 1.8 47 47
915
3.6
16 100 3.6 2.7 1.2 1.8 33 33
Recommended Component Types
Part number
Component
Manufacturer
434MHz
868 MHz
915MHz
Note
L1
Coilcraft
0603CS-18NX
0603CS-3N9X
0603CS-3N9X
1
L4
Coilcraft
0603CS-18NX
0603CS-3N9X
0603CS-3N9X
1
L2
Coilcraft
0603CS-47NX
0603CS-18NX
0603CS-16NX
1
L3 Coilcraft
0603CS-R39X
0603CS-R10X
0603CS-R10X 2
C9 Murata
GRM1885C1H2R7CZ01B
GRM1885C1H1R2CZ01B
GRM1885C1H1R2CZ01B
3
C8
Murata
GRM1885C1H5R0CZ01B
GRM1885C1H2R7CZ01B
GRM1885C1H2R7CZ01B
3
C10
Murata
GRM1885C1H2R7CZ01B
GRM1885C1H1R8CZ01B
GRM1885C1H1R8CZ01B
3, 4
C11 Murata
GRM1885C1H221JA01B
GRM1885C1H470JZ01B
GRM1885C1H330JZ01B
3
C3 Murata
GRM1885C1H221JA01B
GRM1885C1H470JZ01B
GRM1885C1H330JZ01B
3
For component selection guidelines, see the notes on the next page.
39