ata5756-6dqy ATMEL Corporation, ata5756-6dqy Datasheet - Page 10

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ata5756-6dqy

Manufacturer Part Number
ata5756-6dqy
Description
Ata5756 Uhf Ask/fsk Transmitter
Manufacturer
ATMEL Corporation
Datasheet

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ATA5756/ATA5757
The 0.66 pF output capacitance absorbed into the load impedance a real impedance of 684
(ATA5756) at 315 MHz and 623
work analyses at pin 5 (ANT1) with the ATA5756/ATA5757 soldered, an optimized antenna
connected and the power amplifier switched off.
Less output power is achieved by lowering the real parallel part where the parallel imaginary part
should be kept constant. Lowering the real part of the load impedance also reduces the supply
voltage dependency of the output power.
Output power measurement can be done with the circuit as shown in
that the component values must be changed to compensate the individual board parasitics until
the ATA5756/ATA5757 has the right load impedance. Also, the damping of the cable used to
measure the output power must be calibrated.
Figure 4-6.
Table 4-2
supply voltage.
Table 4-2.
Table 4-3.
Ambient Temperature
T
T
Temperature
T
T
T
T
T
T
amb
amb
amb
amb
amb
amb
amb
amb
Ambient
= +125°C
= +125°C
= +25°C
= +85°C
and
= +25°C
= +85°C
= -40°C
= -40°C
Output Power Measurement ATA5756/ATA5757
Table 4-3
Output Power and Supply Current versus Temperature and Supply
Voltage for the ATA5756 with Z
Output Power and Supply Current versus Temperature and Supply
Voltage for the ATA5757 with Z
ANT1
ANT2
show the output power and the supply current versus temperature and
~
3.3 ±1.5 / 7.6
2.7 ±1.5 / 8.1
3.0 ±1.5 / 8.0
2.8 ±1.5 / 8.0
3.1 ±1.5 / 7.2
3.0 ±1.5 / 7.5
3.0 ±1.5 / 7.5
2.5 ±1.5 / 7.6
(dBm/mA)
V
(dBm/mA)
V
Z
S
S
Lopt
= 2.0 V
= 2.0 V
(ATA5757) at 433.92 MHz should be measured with a net-
C
C
L
V
2
1
S
1
= 2.2 pF/1.8 pF
= 1n
= 68 nH/ 39 nH
Load
Load
= 380
= 280
Z = 50
6.2 +2/-3 / 8.1
5.7 +2/-3 / 8.6
5.5 +2/-3 / 8.7
6.1 +2/-3 / 7.7
5.8 +2/-3 / 8.2
5.5 +2/-3 / 8.2
6.0 ±2 / 8.5
6.0 ±2 / 8.1
(dBm/mA)
V
(dBm/mA)
V
S
S
= 3.0 V
= 3.0 V
+ j340
+ j310
Power
meter
(Correlation Tested)
(Correlation Tested)
50
R
in
Figure
7.1 +2/-3 / 7.9
7.2 +2/-3 / 8.5
6.5 +2/-3 / 8.5
7.1 +2/-3 / 8.4
6.8 +2/-3 / 8.8
6.6 +2/-3 / 8.9
4-6. Please note
7.4 ±2 / 8.3
7.5 ±2 / 8.8
(dBm/mA)
(dBm/mA)
V
V
S
S
= 3.6 V
= 3.6 V
4702I–RKE–11/05

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