ATA3742P3-TGQY Atmel, ATA3742P3-TGQY Datasheet - Page 10

• Manufacturer Part Number: ATA3742P3-TGQY
• Description: IC UHF ASK/FSK RECEIVER 20SOIC
• Manufacturer: Atmel

Specifications of ATA3742P3-TGQY

• Frequency: 310MHz ~ 440MHz
• Sensitivity: -108dBm
• Data Rate - Maximum: 10 kBaud
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, TPM, Security Systems
• Current - Receiving: 7mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Operating Frequency (max): 450000kHz
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: ATA3742P3-TGQYTR

4.5
10
Receiving Characteristics
ATA3742
Each BR_Range is also defined by a minimum and a maximum edge-to-edge time (t
These limits are defined in the electrical characteristics. They should not be exceeded to main-
tain full sensitivity of the receiver.
The RF receiver ATA3742 can be operated with and without a SAW front-end filter. In a typical
automotive application, a SAW filter is used to achieve better selectivity. The selectivity with and
without a SAW front-end filter is illustrated in
ASK mode. FSK mode exhibits similar behavior. Note that the mirror frequency is reduced by
40 dB. The plots are printed relatively to the maximum sensitivity. If a SAW filter is used, an
insertion loss of about 4 dB must be considered.
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 ATA3742. Low-cost crystals are
specified to be within ±100 ppm. The XTO deviation of the ATA3742 is an additional deviation
due to the XTO circuit. This deviation is specified to be ±30 ppm. If a crystal of ±100 ppm is
used, the total deviation is ±130 ppm. Note that the receiving bandwidth and the IF-filter band-
width are equivalent in ASK mode but not in FSK mode.
Figure 4-4.
Receiving Frequency Response
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
-6
-5
-4
-3
-2
-1
Figure 4-4 on page
df (mHz)
0
with SAW
1
2
without SAW
3
4
10. This example relates to
5
6
4900B–RKE–11/07
ee_sig
).