EVB72036 Datasheet, PDF (7/12 Pages) Melexis Microelectronic Systems – 868/915MHz FSK/ASK Transmitter Evaluation Board Description

EVB72036
868/915MHz FSK/ASK Transmitter
Evaluation Board Description
3 50Ω Connector Board Circuit Diagram
Fig. 6: Circuit diagram with 50 Ω matching network
PRELIMINARY ^{3.1 Board Component Values}
Part
CM1
CM2
CM3
LM
LT
CX1_{_FSK}
CX1_{_ASK}
Size
0805
0805
0805
0805
0805
0805
0805
Value @
868.3 MHz
1.8 pF
5.6 pF
68 pF
12 nH
15 nH
22 pF
27 pF
Value @
915 MHz
2.2 pF
5.6 pF
68 pF
10 nH
10 nH
22 pF
27 pF
Toler-
ance
±5%
±5%
±5%
±5%
±5%
±5%
±5%
Description
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor r
impedance matching inductor
output tank inductor
XOSC FSK capacitor (Δf = ±20 kHz), note 1
XOSC ASK capacitor, trimmed to f_C, note 1
CX2
0805
12pF
12 pF
±5% XOSC capacitor (Δf = ±20 kHz), note 1, only for FSK
CCK 0805
15 pF/ 180 pF
±5% capacitor to control clock voltage swing (CKDIV 0 / 1)
RPS
0805
NIP
±5% power-select resistor, see data sheet section 4.6
R1
0805
0Ω
±5% ASK jumper (for ASK only), see data sheet sect. 4.7
CB0
1206
220 nF
±20% de-coupling capacitor
CB1
0805
330 pF
±10% de-coupling capacitor
XTAL
SMD 27.13438 MHz 28.59375 MHz
6x3.5
±30ppm cali., ±30ppm temp
fundamental mode crystal,
C_L = 12 pF, C_{0, max} = 7 pF, R₁ = 40 Ω
CK
0805
1 nF
±10% ROI coupling capacitor, only required for
external reference frequency input
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
3901272036 01
Rev. 002
Page 7 of 12
EVB Description
June/07