ATA5757 ATMEL Corporation, ATA5757 Datasheet - Page 10

• Manufacturer Part Number: ATA5757
• Description: (ATA5756 / ATA5757) UHF ASK/FSK TRANSMITTER
• Manufacturer: ATMEL Corporation

10
ATA5756/ATA5757
Output power measurement can be done with the circuit as shown in Figure 9. Please
note 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 9. Output Power Measurement ATA5756/ATA5757
Table 2 and Table 3 show the output power and the supply current versus temperature
and supply voltage.
Table 2. Output Power and Supply Current versus Temperature and Supply
Table 3. Output Power and Supply Current versus Temperature and Supply
T
T
Temperature
Temperature
T
T
T
T
T
T
amb
amb
amb
amb
amb
amb
amb
amb
Ambient
Ambient
= +125°C
= +125°C
= +25°C
= +85°C
= +25°C
= +85°C
= -40°C
Voltage for the ATA5756 with Z
Voltage for the ATA5757 with Z
= -40°C
ANT1
ANT2
~
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
Z
(dBm/mA)
V
(dBm/mA)
V
Lopt
S
S
= 2.0 V
= 2.0 V
C
C
L
V
2
1
1
S
= 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 Ω
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
(dBm/mA)
6.0 ±2 / 8.1
V
(dBm/mA)
V
S
S
= 3.0 V
= 3.0 V
Power
meter
50 Ω
R
in
7.1 +2/-3 / 8.4
6.8 +2/-3 / 8.8
6.6 +2/-3 / 8.9
7.1 +2/-3 / 7.9
7.2 +2/-3 / 8.5
6.5 +2/-3 / 8.5
7.5 ±2 / 8.8
7.4 ±2 / 8.3
(dBm/mA)
V
(dBm/mA)
V
S
S
4702H–RKE–09/04
= 3.6 V
= 3.6 V