IC RCVR UHF ASK 433MHZ 20SOIC

ATA5744N-TGSY

Manufacturer Part NumberATA5744N-TGSY
DescriptionIC RCVR UHF ASK 433MHZ 20SOIC
ManufacturerAtmel
ATA5744N-TGSY datasheet
 

Specifications of ATA5744N-TGSY

Frequency300MHz ~ 450MHzSensitivity-112dBm
Data Rate - Maximum10 kBaudModulation Or ProtocolASK, FSK
ApplicationsRKE, Telemetering, Security TechnologyCurrent - Receiving7.1mA
Data InterfacePCB, Surface MountAntenna ConnectorPCB, Surface Mount
FeaturesRSSI EquippedVoltage - Supply4.5 V ~ 5.5 V
Operating Temperature-40°C ~ 105°CPackage / Case20-SOIC (0.300", 7.50mm Width)
Operating Frequency (max)450000kHzOperating Temperature (min)-40C
Operating Temperature (max)105COperating Temperature ClassificationIndustrial
Operating Supply Voltage (min)4.5VOperating Supply Voltage (typ)5V
Operating Supply Voltage (max)5.5VLead Free Status / RoHS StatusLead free / RoHS Compliant
Memory Size-  
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Figure 3-3.
Input Matching Network without SAW Filter
f
= 433.92 MHz
RF
C3
25n
15p
RF
IN
3.3p
100p
TOKO LL2012
22n
F22NJ
Please note that for all coupling conditions (see
wire inductivity of the LNA ground is compensated. C3 forms a series resonance circuit together
with the bond wire. L = 25 nH is a feed inductor to establish a DC path. Its value is not critical but
must be large enough not to detune the series resonance circuit. For cost reduction, this induc-
tor can be easily printed on the PCB. This configuration improves the sensitivity of the receiver
by about 1 dB to 2 dB.
4. Analog Signal Processing
4.1
IF Amplifier
The signals coming from the RF front end are filtered by the fully integrated 4th-order IF filter.
T h e I F c e n t e r f r e q u e n c y i s f
f
= 433.92 MHz is used. For other RF input frequencies, refer to
RF
mine the center frequency.
The receiver ATA5744 employs an IF bandwidth of B
the U2741B in ASK mode.
4.2
RSSI Amplifier
The subsequent RSSI amplifier enhances the output signal of the IF amplifier before it is fed into
the demodulator. The dynamic range of this amplifier is DRRSSI = 60 dB. If the RSSI amplifier is
operated within its linear range, the best S/N ratio is maintained. If the dynamic range is
exceeded by the transmitter signal, the S/N ratio is defined by the ratio of the maximum RSSI
output voltage and the RSSI output voltage due to a disturber. The dynamic range of the RSSI
amplifier is exceeded if the RF input signal is about 60 dB higher compared to the RF input sig-
nal at full sensitivity.
ATA5744
6
ATA5744
f
= 315 MHz
RF
8
LNAGND
9
LNA_IN
C3
33p
RF
IN
Figure 3-2 on page 5
= 1 M H z f o r a p p l i c a t i o n s w h e r e f
I F
ATA5744
8
LNAGND
9
LNA_IN
25n
3.3p
100p
TOKO LL2012
39n
F39NJ
and
Figure
3-3), the bond
= 3 1 5 M H z o r
R F
Table 3-1 on page 5
to deter-
= 600 kHz and can be used together with
IF
4893A–RKE–11/05