EVB71111
868/915MHz Receiver
Evaluation Board Description
2.2.2
Part
C1
C3
C4
C5
C7
C9
C10
C11
C16
Board Component Values for ASK
Size
0805
0603
0603
0603
0603
0603
0603
0603
0805
Value
@ 868.3 MHz
22 pF
1 nF
4.7 pF
2.7 pF
1.0 pF
33 nF
1 nF
1 nF
1.5 nF
Value
@ 915 MHz
22 pF
1 nF
NIP
NIP
0.68 pF
33 nF
1 nF
1 nF
1.5 nF
Tolerance
±5%
±10%
±5%
±5%
±5%
±10%
±10%
±10%
±10%
Description
crystal series capacitor
loop filter capacitor
capacitor to match SAW filter input
capacitor to match SAW filter output
MIX1 input matching capacitor
IFA feedback capacitor
IFA feedback capacitor
IFA feedback capacitor
RSSI output low-pass capacitor,
this value for data rates < 10 kbps NRZ,
for higher data rates decrease the value
data slicer capacitor,
this value for data rates > 0.8 kbps NRZ,
for lower data rates increase the value
de-coupling capacitor
de-coupling capacitor
optional capacitor,
to couple external RO signal
loop filter resistor
optional CERFIL output matching resistor
data slicer resistor
MIX1 bias resistor
MIX1 bias resistor
SAW filter matching inductor
from Würth-Elektronik (WE-KI series),
or equivalent part
LNA output tank inductor from Würth-Elek-
tronik (WE-KI series), or equivalent part
fundamental-mode crystal from
Telcona/Horizon (HEX22 series)
or equivalent par
fundamental-mode crystal, C
load
= 10 pF
to 15 pF, C
0, max
= 7 pF, R
1, max
= 50
Ωl
low-loss SAW filters from Murata
or equivalent part
C17
CB1 to CB5
CB7 to CB8
CB6
C_RO
R1
R2
R4
RL1
RL2
L1
L2
L3
0805
0603
0805
0603
0805
0603
0805
0805
0805
0603
0603
0603
SMD
6x3.5
HC49
SMD
10 nF
330 pF
33 nF
330 pF
10 kΩ
330
Ω
330 kΩ
470
Ω
470
Ω
22 nH
22 nH
10 nH
10 nF
330 pF
33 nF
330 pF
10 kΩ
330
Ω
330 kΩ
470
Ω
470
Ω
0
Ω
0
Ω
10 nH
±10%
±10%
±10%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
XTAL
26.80000 MHz
@ RF = 868.3 MHz
28.25938 MHz
@ RF = 915 MHz
±25ppm
cal.
±30ppm
temp.
SAWFIL
SMD
3x3
SMD
3.8x3.8
SMD
3.45x3.1
SAFCC868MSL0X00
(f
0
=868.3 MHz)
SAFCH915MAL0N00
(f
0
= 915 MHz)
SFECF10M7HA00
B
3dB
= 2 MHz
B
3dB
= 40 MHz
B
3dB
= 180 kHz
CERFIL
ceramic filter from Murata,
or equivalent part
39012 71111 01
Rev. 011
Page 10 of 14
EVB Description
June/07
MELEXIS [ Melexis Microelectronic Systems ]
