EVB72006
315MHz FSK/ASK Transmitter
Evaluation Board Description
3 50
Ω
Connector Board Circuit Diagram
Fig. 6:
Circuit diagram with 50
Ω
matching network
3.1
Board Component Values
Size
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
0805
SMD
6x3.5
0805
Part
CM1
CM2
CM3
LM
LT
CX1
_FSK
CX1
_ASK
CX2
CCK
RPS
R1
CB0
CB1
XTAL
CK
Value
@ 315 MHz
10 pF
15 pF
82 pF
47 nH
33 nH
10 pF
18 pF
220 pF
39 pF/ 220 pF
NIP
0
Ω
220 nF
330 pF
Tolerance
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±20%
±10%
Description
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
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
de-coupling capacitor
fundamental-mode crystal,
C
L
= 12 pF, C
0, max
= 7 pF, R
1
= 60
Ω
ROI coupling capacitor, only required for
external reference frequency input
9.84375 MHz
±30ppm
cal.,
±30ppm
temp.
1 nF
±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 ]
