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TH72001 Datasheet(PDF) 3 Page - Melexis Microelectronic Systems

Part # TH72001
Description  FSK Transmitter
Download  20 Pages
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

TH72001 Datasheet(HTML) 3 Page - Melexis Microelectronic Systems

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TH72001
315MHz
FSK Transmitter
3901072001
Page 3 of 20
Data Sheet
Rev. 010
Jun/12
1 Theory of Operation
1.1
General
As depicted in Fig.1, the TH72001 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
internal 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)
synthesizer. 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 2.1 V to 5.5 V.
1.2
Block Diagram
Fig. 1: Block diagram with external components
CX1
FSKDTA
antenna
matching
network
VEE
XOSC
low
voltage
detector
PA
XBUF
VCO
PLL
CP
PFD
32
OUT
PSEL
RPS
FSKSW
ROI
XTAL
CX2
8
1
7
5
3
2
mode
control
ENTX
4
6
VCC


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