ATA5824-PLQW Atmel, ATA5824-PLQW Datasheet - Page 16

• Manufacturer Part Number: ATA5824-PLQW
• Description: IC TXRX UHF ASK/FSK 48QFN
• Manufacturer: Atmel

Specifications of ATA5824-PLQW

• Frequency: 433 ~ 435MHz; 866 ~ 870MHz
• Data Rate - Maximum: 20kbps
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, TPM, Security Systems
• Power - Output: 10dBm
• Sensitivity: -116dBm
• Voltage - Supply: 2.15 V ~ 3.6 V or 4.4 V ~ 5.25 V
• Current - Receiving: 10.5mA
• Current - Transmitting: 10.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 48-VQFN Exposed Pad, 48-HVQFN, 48-SQFN, 48-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -

16
ATA5823/ATA5824
Table 7-6
cies. Note that sometimes the blocking is measured relative to the sensitivity level
(denoted dBS) instead of the carrier
Table 7-6.
The ATA5823/ATA5824 can also receive FSK and ASK modulated signals if they are much
higher than the I1dBCP. It can typically receive useful signals at +10 dBm. This is often referred
to as the nonlinear dynamic range which is the maximum to minimum receiving signal which is
115.5 dB for 433.92 MHz/FSK/20 Kbit/s/±19.5 kHz/ Manchester. This value is useful if two
transceivers have to communicate and are very close to each other.
In a keyless entry system there is another blocking characteristic that has to be considered. A
keyless entry system has a typical service range of about 30 m with a receiver sensitivity of
about
important to know how large this blockers can be until the system doesn’t work anymore and the
user has to use its key. With a recommended sensitivity of about
just around the car.
important case with a useful signal of
Manchester.
As can be seen the system works even with blockers above the compression point. This is due
to a wide bandwidth automatic gain control that begins to work if blockers above the compres-
sion point are at the antenna input and increasing the current in the LNA/Mixer to get a better
compression point needed to handle these large blockers.
Figure 7-6.
–
Frequency Offset
106 dBm to
shows the blocking performance measured relative to
+0.75 MHz
–0.75 MHz
+1.0 MHz
–1.0 MHz
+1.5 MHz
–1.5 MHz
+10 MHz
–10 MHz
Blocking 3 dB Above Sensitivity Level with BER < 10
±2.5 MHz Blocking Characteristic for
Figure 7-6
–
109 dBm. In some cases, large blockers limit this service range, and it is
-20
-30
-40
-50
-60
-70
-80
-90
-2.5
Distance of Interfering to Receiving Signal (MHz)
-2.0
and
-1.5
Figure 7-7 on page 17
–
102.5 dBm (denoted dBC).
-1.0
Blocker Level
–47.5 dBm
–47.5 dBm
–44.5 dBm
–44.5 dBm
–42.0 dBm
–42.0 dBm
–35.5 dBm
–35.5 dBm
–
-0.5
85dBm 433.92 MHz/FSK/20 Kbit/s/±19.5 kHz/
0
–
85 dBm Useful Signal at 433.92 MHz
0.5
show the blocking performance in this
1.0
1.5
–
102.5 dBm for some frequen-
–
-3
85 dBm, the system works
2.0
55.0 dBC/58.0 dBS
55.0 dBC/58.0 dBS
58.0 dBC/61.0 dBS
58.0 dBC/61.0 dBS
60.5 dBC/63.5 dBS
60.5 dBC/63.5 dBS
67.0 dBC/70.0 dBS
67.0 dBC/70.0 dBS
2.5
Blocking
4829D–RKE–06/06
–
105.5 dBm