EVB72005 Datasheet, PDF (9/14 Pages) Melexis Microelectronic Systems – 315MHz FSK/ASK Transmitter Evaluation Board Description

EVB72005
315MHz FSK/ASK Transmitter
Evaluation Board Description
4 50Ω Connector Board Circuit Diagram
OUT
CM2
LM
CM3
CM1
CB1
LT
10 9 8 7 6
RPS
Fig. 7: Circuit diagram with 50 Ω matching network
123 4 5
CB0
CX2
XTAL
CX1
CK
12345 6
12 3
45 6
4.1 Board Component Values to Fig. 7
Part
Size
Value
@ 315 MHz
Tolerance
Description
CM1
CM2
CM3
LM
LT
CX1_{_FSK}
CX1_{_ASK}
CX2
RPS
CB0
CB1
XTAL
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
0805
HC49/S
CK
0805
10 pF
±5%
15 pF
±5%
82 pF
±5%
47 nH
±5%
33 nH
±5%
15 pF
±5%
27 pF
±5%
47 pF
±5%
NIP
±5%
220 nF
±20%
330 pF
±10%
9.84375MHz
±30ppm cal., ±30ppm temp.
1 nF
±10%
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
impedance matching inductor
output tank inductor
XOSC FSK capacitor (Δf = ±20 kHz), note 1
XOSC ASK capacitor, trimmed to f_C, note 1
XOSC capacitor (Δf = ±20 kHz), note 1, only needed for FSK
power-select resistor, see data sheet section 4.6
de-coupling capacitor
de-coupling capacitor
fundamental-mode crystal,
C_L = 12 pF, C_{0, max} = 7 pF, R₁ = 60 Ω
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
39012 72005 01
Rev. 007
Page 9 of 14
EVB Description
June/07