ATA8742 ATMEL Corporation, ATA8742 Datasheet - Page 12

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ATA8742

Manufacturer Part Number
ATA8742
Description
Manufacturer
ATMEL Corporation
Datasheet

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8. Application
12
ATA8742
For the supply-voltage blocking capacitor C
are used to match the loop antenna to the power amplifier, where C
C
achieve a better tolerance value and to have the possibility of realizing the Z
standard valued capacitors.
Together with the pins and the PCB board wires C
presses the 1
suppression is achieved when C
The loop antenna should not exceed a width of 1.5 mm, otherwise the Q-factor of the loop
antenna is too high.
L
load resonance frequency of the crystal. Normally, a value of 12 pF results for a 15 pF
load-capacitance crystal.
Figure 8-1.
1
2
(50 nH to 100 nH) can be printed on PCB. C
is 6 pF/NP0 (10 pF + 15 pF in series); for C
GND
VS
st
ESD Protection Circuit
harmonic, hence the position of C
CLK
1
is placed as close as possible to the pins ANT1 and ANT2.
PA_ENABLE
3
, a value of 68 nF/X7R is recommended. C
4
2
should be selected that the XTO runs on the
1
two capacitors in series should be used to
on the PCB is important. Normally the best
1
forms a series resonance loop that sup-
ANT1
ANT2
1
XTAL
typically is 8.2 pF/NP0 and
ENABLE
Load,opt
9151A–INDCO–07/09
by using
1
and C
2

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