EVB72005 Melexis Company, EVB72005 Datasheet - Page 7

• Manufacturer Part Number: EVB72005
• Description: 315mhz Fsk/ask Transmitter Evaluation Board Description
• Manufacturer: Melexis Company

3 Antenna Board Circuit Diagram
Fig. 6:
3.1 Board Component Values to Fig. 6
Note 1: depends on crystal parameters, other ∆f values can be selected with other CX1, CX2 values
39012 72005 01
Rev. 007
CX1
CX1
XTAL
Part
CM1
CM2
RPS
LM1
LM2
CX2
CB0
CB1
CK
_ASK
_FSK
Circuit diagram with loop antenna matching network
NIP – not in place, may be used optionally
HC49/S
Size
0603
0603
0603
0603
0805
0805
0805
0603
1206
0603
0805
@ 315 MHz
±30ppm cal., ±30ppm temp.
220 nF
330 pF
Value
6.8 pF
15 nH
82 nH
27 pF
12 pF
27 pF
39 pF
1 nF
NIP
9.84375MHz
Tolerance
±20%
±10%
±10%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
Page 7 of 14
impedance matching capacitor
impedance matching capacitor
impedance matching inductor
impedance matching inductor
XOSC FSK capacitor (Δf = ±20 kHz), note 1
XOSC ASK capacitor, trimmed to f
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
ROI coupling capacitor, only required for
external reference frequency input
L
= 12 pF, C
315MHz FSK/ASK Transmitter
0, max
Evaluation Board Description
= 7 pF, R
CB1
CM2
Description
CB0
PCB loop antenna
1
1
= 60 Ω
2 3
10
1
EVB72005
C
9
2
CX2
, note 1
1 2 3 4 5 6
CX1
3
8
7
4
CM1
EVB Description
XTAL
5
6
CK
4
5 6
June/07
RPS