EVB72013 Datasheet, PDF (7/13 Pages) Melexis Microelectronic Systems – FSK/ASK Transmitter

9. 50Ω Connector Board Circuit Diagram
EVB72013
433MHz
FSK/ASK Transmitter

Fig. 6: Circuit diagram with 50  matching network
9.1 Board Component Values to Fig. 7
Part Size
Value @
433.92 MHz
Tolerance
Description
CM1
CM2
CM3
LM
LT
CX1
CX2
RPS
R1
CB0
CB1
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
8.2 pF
15 pF
82 pF
22 nH
27 nH
10 pF
12 pF
NIP
NIP
220 nF
330 pF
2%
2%
2%
5%
5%
2%
2%
5%
5%
20%
10%
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
impedance matching inductor, note 2
output tank inductor, note 2
XOSC capacitor (f = 20 kHz) , note 1
XOSC capacitor (f = 20 kHz) , note 1
power-select resistor, see data sheet, sec 4.6 and 4.7
ASK mode: 0Ω jumper (ASK data can be applied at
input PSEL), see data sheet, sec 4.7
de-coupling capacitor
de-coupling capacitor
Y1
SMD
6x3.5
27.12000 MHz
30ppm calibr.
20ppm temp.
fundamental wave crystal
(C3M2712000E10FSDHK01),
CL = 10 pF, C0 = 3 pF, R1 = 50 
Note 1: depends on crystal parameters, other ∆f values can be selected with other CX1, CX2 values
Note 2: for high-power applications high-Q wire-wound inductors should be used
 NIP – not in place, may be populated optionally
39012 7201301
Rev. 004
Page 7 of 12
EVB Description
Nov/15