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EVB72036-868-FSK-A Datasheet(PDF) 4 Page - Melexis Microelectronic Systems

Part # EVB72036-868-FSK-A
Description  868/915MHz FSK/ASK Transmitter Evaluation Board Description
Download  12 Pages
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

EVB72036-868-FSK-A Datasheet(HTML) 4 Page - Melexis Microelectronic Systems

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PR
EL
IM
INA
RY
EVB72036
868/915MHz FSK/ASK Transmitter
Evaluation Board Description
3901272036 01
Page 4 of 12
EVB Description
Rev. 002
June/07
fmin
fc
f
fmax
eff
CL
eff
CL
R1
C1
C0
L1
XTAL
CL
CX1 CRO
CX1+CRO
(CX1+CX2) CRO
CX1+CX2+CRO
2.2
FSK Modulation
FSK modulation can be achieved by pulling the
crystal
oscillator
frequency.
A
CMOS-
compatible data stream applied at the pin
FSKDTA digitally modulates the XOSC via an
integrated NMOS switch. Two external pulling
capacitors CX1 and CX2 allow the FSK devia-
tion
Δf and the center frequency fc to be ad-
justed independently. At FSKDTA = 0, CX2 is
connected in parallel to CX1 leading to the low-
frequency component of the FSK spectrum
(fmin); while at FSKDTA = 1, CX2 is deactivated
and the XOSC is set to its high frequency fmax.
An external reference signal can be directly AC-
coupled to the reference oscillator input pin
ROI. Then the transmitter is used without a
crystal. Now the reference signal sets the car-
rier frequency and may also contain the FSK (or
FM) modulation.
Fig. 2:
Crystal pulling circuitry
FSKDTA
Description
0
fmin= fc - Δf (FSK switch is closed)
1
fmax= fc + Δf (FSK switch is open)
2.3
Crystal Pulling
A crystal is tuned by the manufacturer to the
required oscillation frequency f0 at a given load
capacitance CL and within the specified calibra-
tion tolerance. The only way to pull the oscilla-
tion frequency is to vary the effective load ca-
pacitance CLeff seen by the crystal.
Figure 3 shows the oscillation frequency of a
crystal as a function of the effective load ca-
pacitance. This capacitance changes in accor-
dance with the logic level of FSKDTA around
the specified load capacitance. The figure illus-
trates the relationship between the external
pulling capacitors and the frequency deviation.
It can also be seen that the pulling sensitivity
increases with the reduction of CL. Therefore,
applications with a high frequency deviation
require a low load capacitance. For narrow
band FSK applications, a higher load capaci-
tance could be chosen in order to reduce the
frequency drift caused by the tolerances of the
chip and the external pulling capacitors.
Fig. 3:
Crystal pulling characteristic
For ASK applications CX2 can be omitted. Then CX1 has to be adjusted for center frequency.
CX2
VCC
XTAL
CX1
ROI
FSKSW
VEE


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