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T5754 Datasheet(PDF) 3 Page - ATMEL Corporation

Part No. T5754
Description  UHF ASK/FSK TRANSMITTER
Download  13 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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T5754 Datasheet(HTML) 3 Page - ATMEL Corporation

 
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3
T5754
4511F–RKE–07/04
Figure 3. Block Diagram
General Description
This fully integrated PLL transmitter allows particularly simple, low-cost RF miniature
transmitters to be assembled. The VCO is locked to 32 fXTAL hence a 13.56 MHz crystal
is needed for a 433.92 MHz transmitter. All other PLL and VCO peripheral elements are
integrated.
The XTO is a series resonance oscillator so that only one capacitor together with a
crystal connected in series to GND are needed as external elements.
The crystal oscillator together with the PLL needs typically <1 ms until the PLL is locked
and the CLK output is stable. There is a wait time of
≥ 1 ms until the CLK is used for the
microcontroller and the PA is switched on.
The power amplifier is an open-collector output delivering a current pulse which is nearly
independent from the load impedance. The delivered output power is hence controllable
via the connected load impedance.
This output configuration enables a simple matching to any kind of antenna or to 50
Ω. A
high power efficiency of
η=P
out/(IS,PA VS) of 36% for the power amplifier results when
an optimized load impedance of ZLoad = (166 + j223) Ω is used at 3 V supply voltage.
CLK
PA_ENABLE
ANT2
ANT1
ENABLE
GND
VS
XTAL
1
2
3
4
5
6
7
8
VCO
LF
CP
f
32
XTO
PLL
PA
f
4
Power up/down
T5754
PFD


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