EVB72006
315MHz FSK/ASK Transmitter
Evaluation Board Description
3 50Ω Connector Board Circuit Diagram
Fig. 6: Circuit diagram with 50 Ω matching network
3.1 Board Component Values
Value
@ 315 MHz
Part
Size
Tolerance
Description
CM1
CM2
CM3
LM
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
0805
10 pF
15 pF
impedance matching capacitor
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±20%
±10%
impedance matching capacitor
impedance matching capacitor
impedance matching inductor
output tank inductor
82 pF
47 nH
LT
33 nH
CX1_FSK
CX1_ASK
CX2
10 pF
XOSC FSK capacitor (Δf = ±20 kHz), note 1
XOSC ASK capacitor, trimmed to fC, note 1
18 pF
220 pF
39 pF/ 220 pF
NIP
XOSC capacitor (Δf = ±20 kHz), note 1, only needed for FSK
capacitor to control clock voltage swing (CKDIV 0 / 1)
power-select resistor, see data sheet section 4.6 and 4.7
ASK jumper (for ASK only), see data sheet section 4.7
de-coupling capacitor
CCK
RPS
R1
0 Ω
220 nF
330 pF
CB0
CB1
de-coupling capacitor
XTAL
SMD
6x3.5
9.84375 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 72006 01
Rev. 004
Page 7 of 12
EVB Description
Dec/07
MELEXIS [ Melexis Microelectronic Systems ]
