ATA8204P3-TKQY Atmel, ATA8204P3-TKQY Datasheet - Page 9

• Manufacturer Part Number: ATA8204P3-TKQY
• Description: IC RCVR ASK/FSK UHF 433MHZ 20SSO
• Manufacturer: Atmel

Specifications of ATA8204P3-TKQY

• Frequency: 433MHz
• Sensitivity: -115dBm
• Data Rate - Maximum: 10 kbps
• Modulation Or Protocol: ASK, FSK
• Applications: General Purpose
• Current - Receiving: 8.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Features: RSSI Equipped
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (0.200", 5.30mm Width)
• Pin Count: 20
• Screening Level: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant

5. Receiving Characteristics
9121B–INDCO–04/09
The RF receiver ATA8203/ATA8204/ATA8205 can be operated with and without a SAW
front-end filter. In a typical automotive application, a SAW filter is used to achieve better selectiv-
ity and large signal capability. The receiving frequency response without a SAW front-end filter is
illustrated in
relates to ASK mode. FSK mode exhibits a similar behavior. The plots are printed relatively to
the maximum sensitivity. If a SAW filter is used, an insertion loss of about 3 dB must be consid-
ered, but the overall selectivity is much better.
When designing the system in terms of receiving bandwidth, the LO deviation must be consid-
ered as it also determines the IF center frequency. The total LO deviation is calculated, to be the
sum of the deviation of the crystal and the XTO deviation of the ATA8203/ATA8204/ATA8205.
Low-cost crystals are specified to be within ±90 ppm over tolerance, temperature, and aging.
The XTO deviation of the ATA8203/ATA8204/ATA8205 is an additional deviation due to the
XTO circuit. This deviation is specified to be ±10 ppm worst case for a crystal with CM = 7 fF. If
a crystal of ±90 ppm is used, the total deviation is ±100 ppm in that case. Note that the receiving
bandwidth and the IF-filter bandwidth are equivalent in ASK mode but not in FSK mode.
Figure 5-1.
Figure 5-1
-10
-20
-30
-40
-50
-60
-70
10
0
Narrow Band Receiving Frequency Response ATA8204
430
431
“Narrow Band Receiving Frequency Response ATA8204”. This example
Image Rejection versus RF Frequency
432
433
(MHz)
ATA8203/ATA8204/ATA8205
434
435
436
437
438
4.5V -40
5V -40
5.5V -40
4.5V 25
5V 25
5.5V 25
˚
˚
C
C
˚
˚
˚
˚
C
C
C
C
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