TH72006 Datasheet, PDF (12/16 Pages) Melexis Microelectronic Systems – 315MHz FSK/ASK Transmitter

5 Test Circuit
OUT
CM2
CM1
LM
CM3
LT
CB1
10 9 8
RPS
76
TH72006
315MHz
FSK/ASK Transmitter
12345
CX1
R1
CB0
12
12 1 2 3 12 12 12
Fig. 6: Test circuit for FSK and ASK with 50 Ω matching network
5.1 Test circuit component list to Fig. 6
Part Size
Value @
315 MHz
Tolerance
Description
CM1 0805
10pF
±5%
impedance matching capacitor
CM2 0805
15 pF
±5%
impedance matching capacitor
CM3 0805
82 pF
±5%
impedance matching capacitor
LM
0805
47 nH
±5%
impedance matching inductor, note 2
LT
0805
33 nH
±5%
output tank inductor, note 2
CX1_{_FSK}
CX1_{_ASK}
CX2
0805
0805
0805
10 pF
18 pF
220 pF
±5%
±5%
±5%
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
CCK 0805
39 pF / 270 pF
±5%
clock spur suppression capacitor, CKDIV 0 / 1
RPS
0805
see section 4.6
±5%
FSK or CW mode power-select resistor
R1
0805
see section 4.7
CB0
1206
220 nF
CB1
0805
330 pF
±5%
±20%
±10%
ASK power-select resistor, not used at FSK
de-coupling capacitor
de-coupling capacitor
XTAL
SMD
6x3.5
9.84375MHz
±30ppm cal. fundamental wave crystal,
±30ppm temp. CL = 12 pF, C0, max = 7 pF, R1 = 60 Ω
Note 1: value depending on crystal parameters
Note 2: for high-power applications high-Q wire-wound inductors should be used
39010 72006
Rev. 005
Page 12 of 16
Data Sheet
Dec/07