ATAB5756 Atmel, ATAB5756 Datasheet - Page 10

• Manufacturer Part Number: ATAB5756
• Description: BOARD DEMO RF TRANSMITTER 315MHZ
• Manufacturer: Atmel
• Series: Smart RFr
• Type: Transmitterr

Specifications of ATAB5756

• Frequency: 315MHz
• Wireless Frequency: 315 MHz
• Modulation: ASK, FSK
• For Use With/related Products: ATA5756 @ 315MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-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