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EVB72005-868-ASK-C Datasheet(PDF) 3 Page - Melexis Microelectronic Systems

Part # EVB72005-868-ASK-C
Description  315MHz FSK/ASK Transmitter Evaluation Board Description
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

EVB72005-868-ASK-C Datasheet(HTML) 3 Page - Melexis Microelectronic Systems

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EVB72005
315MHz FSK/ASK Transmitter
Evaluation Board Description
39012 72005 01
Page 3 of 14
EVB Description
Rev. 007
June/07
1
Theory of Operation
1.1
General
As depicted in Fig.1, the TH72005 transmitter consists of a fully integrated voltage-controlled oscillator
(VCO), a divide-by-32 divider (div32), a phase-frequency detector (PFD) and a charge pump (CP). An inter-
nal loop filter determines the dynamic behavior of the PLL and suppresses reference spurious signals. A
Colpitts crystal oscillator (XOSC) is used as the reference oscillator of a phase-locked loop (PLL) synthe-
sizer. The VCO’s output signal feeds the power amplifier (PA). The RF signal power Pout can be adjusted in
four steps from Pout = –12 dBm to +11 dBm, either by changing the value of resistor RPS or by varying the
voltage VPS at pin PSEL. The open-collector output (OUT) can be used either to directly drive a loop antenna
or to be matched to a 50Ohm load. Bandgap biasing ensures stable operation of the IC at a power supply
range of 1.95 V to 5.5 V.
1.2
Block Diagram
Fig. 1:
Block diagram with external components
2
Functional Description
2.1
Crystal Oscillator
A Colpitts crystal oscillator with integrated functional capacitors is used as the reference oscillator for the PLL
synthesizer. The equivalent input capacitance CRO offered by the crystal oscillator input pin ROI is about
18pF. The crystal oscillator is provided with an amplitude control loop in order to have a very stable fre-
quency over the specified supply voltage and temperature range in combination with a short start-up time.
CX1
FSKDTA
antenna
matching
network
XOSC
PA
XBUF
VCO
PLL
CP
PFD
32
OUT
PSEL
RPS
FSKSW
ROI
XTAL
CX2
VEE
7
VEE
9
2
8
6
4
3
1
ASKDTA
low
voltage
detector
10
VCC
mode
control
ENTX
5


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