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ATAM862-3 Datasheet(PDF) 8 Page - ATMEL Corporation

Part # ATAM862-3
Description  Microcontroller with UHF ASK/FSK Transmitter
Download  110 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATAM862-3 Datasheet(HTML) 8 Page - ATMEL Corporation

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8
4554F–4BMCU–07/07
ATAM862-3
Figure 7-2.
Output Power Measurement
7.4
Application Circuit
For the supply-voltage blocking capacitor C
3, a value of 68 nF/X7R is recommended (see Figure
7-3 on page 9 and Figure 7-4 on page 10). C
1 and C2 are used to match the loop antenna to the
power amplifier where C
1 typically is 22 pF/NP0 and C2 is 10.8 pF/NP0 (18 pF + 27 pF in
series); for C
2 two capacitors in series should be used to achieve a better tolerance value and to
have the possibility to realize the Z
Load,opt by using standard valued capacitors.
C
1 forms together with the pins of PLL transmitter block and the PCB board wires a series reso-
nance loop that suppresses the 1
st harmonic, thus, the position of C
1 on the PCB is important.
Normally the best suppression is achieved when C
1 is placed as close as possible to the pins
ANT1 and ANT2.
The loop antenna should not exceed a width of 1.5 mm, otherwise the Q-factor of the loop
antenna is too high.
L
1 (≈50 nH to 100 nH) can be printed on PCB. C4 should be selected so the XTO runs on the
load resonance frequency of the crystal. Normally, a value of 12 pF results for a 15 pF
load-capacitance crystal.
~
ANT2
ANT1
R
in
Power
meter
C
1 = 1n
L
1 = 33n
C
2 = 2.2p
Z
Lopt
V
S
Z = 50
50


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