EVB71111
868/915MHz Receiver
Evaluation Board Description
2.1.2
Part
Board Component Values for FSK
Value
Value
Size
Tolerance
Description
@ 868.3 MHz
@ 915 MHz
crystal series capacitor
C1
C3
0805
0603
0603
0603
0603
0603
0603
0603
0805
22 pF
1 nF
22 pF
1 nF
±5%
±10%
±5%
loop filter capacitor
capacitor to match SAW filter input
capacitor to match SAW filter output
MIX1 input matching capacitor
IFA feedback capacitor
C4
4.7 pF
2.7 pF
1.0 pF
33 nF
1 nF
NIP
C5
NIP
±5%
C7
0.68 pF
33 nF
1 nF
±5%
C9
±10%
±10%
±10%
±5%
IFA feedback capacitor
C10
C11
C12
IFA feedback capacitor
1 nF
1 nF
DEMOD phase-shift capacitor
10 pF
10 pF
demodulator output low-pass capacitor,
this value for data rates < 20 kbps NRZ,
for higher data rates decrease the value
C15
C16
C17
0805
0805
0805
100 pF
1.5 nF
10 nF
100 pF
1.5 nF
10 nF
±5%
±10%
±10%
RSSI output low-pass capacitor
data slicer capacitor,
this value for data rates > 0.8 kbps NRZ,
for lower data rates increase the value
CB1 to CB5
CB7 to CB8
de-coupling capacitor
0603
0805
0603
330 pF
33 nF
330 pF
33 nF
±10%
±10%
±5%
de-coupling capacitor
CB6
optional capacitor,
to couple external RO signal
C_RO
330 pF
330 pF
loop filter resistor
R1
R2
0805
0603
0805
0805
0805
0805
0603
10 kΩ
330 Ω
330 kΩ
220 kΩ
470 Ω
470 Ω
22 nH
10 kΩ
330 Ω
330 kΩ
220 kΩ
470 Ω
470 Ω
0 Ω
±5%
±5%
±5%
±5%
±5%
±5%
±5%
optional CERFIL output matching resistor
data slicer resistor
R4
loading resistor
R5
MIX1 bias resistor
RL1
RL2
L1
MIX1 bias resistor
SAW filter matching inductor
from Würth-Elektronik (WE-KI series),
or equivalent part
L2
L3
0603
0603
22 nH
10 nH
0 Ω
±5%
±5%
LNA output tank inductor from Würth-Elek-
tronik (WE-KI series), or equivalent part
10 nH
fundamental-mode crystal from
Telcona/Horizon (HEX22 series)
or equivalent par
SMD
6x3.5
26.80000 MHz
@ RF = 868.3 MHz
28.25938 MHz
@ RF = 915 MHz
±25ppm cal.
±30ppm temp.
XTAL
fundamental-mode crystal, Cload = 10 pF
to 15 pF, C0, max = 7 pF, R1, max = 50 Ωl
HC49
SMD
SMD
3x3
SAFCC868MSL0X00
(f0 =868.3 MHz)
low-loss SAW filter from Murata
or equivalent part
B
3dB = 2 MHz
3dB = 40 MHz
B3dB = 180 kHz
SAWFIL
SMD
3.8x3.8
SAFCH915MAL0N00
(f0 = 915 MHz)
B
SMD
3.45x3.1
ceramic filter from Murata,
or equivalent part
CERFIL
CERDIS
SFECF10M7HA00
CDSCB10M7GA135
SMD
4.5x2
ceramic discriminator from Murata,
or equivalent part
39012 71111 01
Rev. 011
Page 7 of 14
EVB Description
June/07
MELEXIS [ Melexis Microelectronic Systems ]
