TH72005 Datasheet, PDF (17/20 Pages) Melexis Microelectronic Systems – 315MHz FSK/ASK Transmitter

6 Test Circuit
TH72005
315MHz
FSK/ASK Transmitter
CM2
CM1
OUT
LM
CM3
LT
RPS
CB1
10 9 8 7 6
1
CB0
23 4
CX2
CX1
5
XTAL
12 12 3 4
12 3
Fig. 18: Test circuit for FSK and ASK with 50 Ω matching network
6.1 Test circuit component list to Fig. 18
Part Size
Value @
315 MHz
Tolerance
Description
CM1
CM2
CM3
LM
LT
CX1_{_FSK}
CX1_{_ASK}
CX2
0805
0805
0805
0805
0805
0805
0805
0805
10 pF
15 pF
82 pF
47 nH
33 nH
15 pF
27 pF
47 pF
RPS
CB0
CB1
XTAL
0805
1206
0805
HC49/S
see section 4.6
220 nF
330 pF
9.84375MHz
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±20%
±10%
±30ppm calibr.
±30ppm temp.
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
impedance matching inductor, note 2
output tank inductor, note 2
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
de-coupling capacitor
de-coupling capacitor
fundamental wave crystal,
C_L = 12 pF, C_{0, 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 72005
Rev. 008
Page 17 of 20
Data Sheet
June/07