ATA8403 ATMEL Corporation, ATA8403 Datasheet - Page 6

• Manufacturer Part Number: ATA8403
• Manufacturer: ATMEL Corporation

4.4
6
Application Circuit
ATA8403
Figure 4-2.
A value of 68 nF/X7R is recommended for the supply-voltage blocking capacitor C
4-3 on page 7
power amplifier where C
series should be used to achieve a better tolerance value and to have the possibility of realizing
the Z
C
that suppresses the 1
mally the best suppression is achieved when C
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
the load resonance frequency of the crystal. Normally, a 15 pF load-capacitance crystal results
in a value of 12 pF.
1
1
, together with the pins of ATA8403 and the PCB board wires, forms a series resonance loop
(
Load,opt
50 nH to 100 nH) can be printed on PCB. C
using standard valued capacitors.
Output Power Measurement
and
Figure 4-4 on page
st
ANT1
ANT2
harmonic. Therefore, the position of C
1
typically is 3.9 pF/NP0 and C
Z
Lopt
V
L
S
1
10 nH
1.5 pF
8). C
1 nF
C
C
1
2
C
3
1
and C
1
is placed as close as possible to the pins ANT1
2.7 pF
4
2
should be selected so that the XTO runs on
Z = 50
are used to match the loop antenna to the
2
is 1 pF/NP0. For C
1
on the PCB is important. Nor-
Power
meter
50
R
in
2
, two capacitors in
4983A–IND–02/07
3
(see
Figure