EVB72015
433MHz FSK/ASK Transmitter
Evaluation Board Description
4 50Ω Connector Board Circuit Diagram
OUT
CM2
LM
CM3
CM1
LT
CB1
10
9
8
7
4
4
6
RPS
3
5
1
2
CX2
XTAL
CX1
CK
CB0
1
2
3
5 6
6
5
4
1 2
3
Fig. 7: Circuit diagram with 50 Ω matching network
4.1 Board Component Values to Fig. 7
Value
@ 433.92 MHz
Part
Size
Tolerance
Description
CM1
CM2
CM3
LM
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
0805
HC49/S
5.6 pF
10 pF
82 pF
33 nH
33 nH
12 pF
27 pF
33 pF
NIP
impedance matching capacitor
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±20%
±10%
impedance matching capacitor
impedance matching capacitor
impedance matching inductor
output tank inductor
LT
CX1_FSK
CX1_ASK
CX2
XOSC FSK capacitor (Δf = ±28 kHz), note 1
XOSC ASK capacitor, trimmed to fC, note 1
XOSC capacitor (Δf = ±28 kHz), note 1, only needed for FSK
power-select resistor, see data sheet section 4.6
de-coupling capacitor
RPS
CB0
220 nF
330 pF
CB1
de-coupling capacitor
XTAL
13.5600 MHz
±30ppm cal., ±30ppm temp.
1 nF
fundamental-mode crystal,
CL = 12 pF, C0, max = 7 pF, R1 = 60 Ω
CK
0805
ROI coupling capacitor, only required for
external reference frequency input
±10%
Note 1: depends on crystal parameters, other ∆f values can be selected with other CX1, CX2 values
NIP – not in place, may be used optionally
39012 72015 01
Rev. 007
Page 9 of 14
EVB Description
June/07
MELEXIS [ Melexis Microelectronic Systems ]
