ATA5756-6DQY71 Atmel, ATA5756-6DQY71 Datasheet - Page 10
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ATA5756-6DQY71
Manufacturer Part Number
ATA5756-6DQY71
Description
RF Transmitter ASK/FSK Transmitter 315MHz TPMS
Manufacturer
Atmel
Type
UHF ASK/FSK Transmittersr
Datasheet
1.ATAB5756.pdf
(20 pages)
Specifications of ATA5756-6DQY71
Package / Case
TSSOP-10
Operating Frequency
315 MHz
Maximum Operating Temperature
125 C
Mounting Style
SMD/SMT
Operating Supply Voltage
2 V to 3.6 V
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
10
ATA5756/ATA5757
The 0.66 pF output capacitance absorbed into the load impedance a real impedance of 684 Ω
(ATA5756) at 315 MHz and 623 Ω (ATA5757) at 433.92 MHz should be measured with a net-
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
3.0 ±1.5 / 8.0
2.8 ±1.5 / 8.0
2.7 ±1.5 / 8.1
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
C
C
L
V
2
1
S
1
= 2.2 pF/1.8 pF
= 1n
= 68 nH/ 39 nH
Load
Load
= 380 Ω + j340 Ω (Correlation Tested)
= 280 Ω + j310 Ω (Correlation Tested)
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
Power
meter
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
4702J–RKE–09/08