ATA5771-DK1 Atmel, ATA5771-DK1 Datasheet - Page 181

• Manufacturer Part Number: ATA5771-DK1
• Description: BOARD XMITTER FOR ATA5771 868MHZ
• Manufacturer: Atmel
• Type: Transmitterr

Specifications of ATA5771-DK1

• Frequency: 868MHz
• Maximum Frequency: 868 MHz
• Supply Voltage (max): 4 V
• Supply Voltage (min): 2 V
• Supply Current: 8.5 mA
• Product: RF Development Tools
• For Use With/related Products: ATA5771
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5. Application
9137E–RKE–12/10
Figure 5-1
sure of the power supply voltage, a capacitor value of C
and C
should be used to achieve a better tolerance value for C
ing the Z
Figure 5-1.
Together with the pins and the PCB board wires C
press the 1
best suppression is achieved when C
ANT2.
The loop antenna should not exceed a width of 1.5 mm, otherwise the Q-factor of the loop
antenna is too high.
The capacitor C
crystal.
2
are used to match the loop antenna to the power amplifier. Two capacitors in series
Load,opt
illustrates a principle application circuit using loop antenna. For the blocking mea-
st
harmonic. Therefore the position of C
The Principle Application Circuit Using a Loop Antenna for ASK Modulation
using standard valued capacitors.
4
should be selected that the XTO runs on the load resonance frequency of the
C4
S1
S1
S1
CLK
PXY
PXY
PXY
PXY
PXY
PXY
PXY
ATA5771/73/74
XTO
f/4
1
is placed as close as possible to the pins ANT1 and
Power
up /
down
VCO
PA
PLL
1
1
Atmel ATA5771/73/74
forms a series resonance loop that sup-
on the PCB is important. Generally the
VCC_RF
ANT2
GND_RF
2
ANT1
ENABLE
PA_ENABLE
VDD
GND
PXY
PXY
PXY
PXY
PXY
3
and allowing the possibility of realiz-
= 68 nF/X7R is recommended. C
VS
C1
C3
VS
C2
VS
Antenna
Loop
181
1