TH71111
868/915MHz
FSK/FM/ASK Receiver
4.1.2
Part
Standard FSK Component List
Value
Size
Tolerance
Description
@ 868.3 MHz
C1
C3
0805
0805
0603
0603
0603
0805
0603
0603
0805
0805
22 pF
1 nF
crystal series capacitor
loop filter capacitor
±5%
±10%
±5%
C4
4.7 pF
2.7 pF
1.0 pF
33 nF
1 nF
capacitor to match SAW filter input
capacitor to match SAW filter output
MIX1 input matching capacitor
IFA feedback capacitor
C5
±5%
C7
±5%
C9
±10%
±10%
±10%
±5%
C10
C11
C12
C15
IFA feedback capacitor
1 nF
IFA feedback capacitor
10 pF
100 pF
DEMOD phase-shift capacitor
demodulator output low-pass capacitor,
this value for data rates < 20 kbps NRZ
±5%
C16
C17
R1
0603
0805
0805
0603
0603
0805
0805
0805
0603
0603
0603
1.5 nF
10 nF
RSSI output low-pass capacitor
data slicer capacitor, this value for data rates > 0.8 kbps NRZ
loop filter resistor
±10%
±10%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
10 kΩ
330 Ω
330 kΩ
220 kΩ
470 Ω
470 Ω
22 nH
22 nH
10 nH
R2
optional CERFIL output matching resistor
data slicer resistor
R4
R5
loading resistor
RL1
RL2
L1
MIX1 bias resistor
MIX1 bias resistor
SAW filter matching inductor from Würth-Elektronik
(WE-KI series), or equivalent part
L2
L3
LNA output tank inductor from Würth-Elektronik (WE-KI series),
or equivalent part
XTAL
SMD
6x3.5
26.80000 MHz
@ RF = 868.3 MHz
fundamental-mode crystal from
Telcona/Horizon or equivalent par
±25ppm cal.
±30ppm temp.
SAWFIL
CERFIL
CERDIS
SMD
3x3
SAFCC868MSL0X00
(f0 =868.3 MHz)
B3dB = 2 MHz
low-loss SAW filter from Murata, or equivalent part
SMD
3.45x3.1
SFECF10M7HA00
B3dB = 180 kHz
ceramic filter from Murata, or equivalent part
SMD
4.5x2
CDSCB10M7GA135
ceramic discriminator from Murata, or equivalent part
• For component values for other frequencies, please refer to the EVB descriptions
39010 71111
Rev. 013
Page 13 of 22
Data Sheet
June/07
MELEXIS [ Melexis Microelectronic Systems ]
