IC RCVR UHF ASK 433MHZ 20SSOP

ATA5744N-TKSY

Manufacturer Part NumberATA5744N-TKSY
DescriptionIC RCVR UHF ASK 433MHZ 20SSOP
ManufacturerAtmel
ATA5744N-TKSY datasheet
 

Specifications of ATA5744N-TKSY

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 (0.200", 5.30mm Width)
Lead Free Status / RoHS StatusLead free / RoHS CompliantMemory Size-
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Figure 2-2.
Block Diagram
CDEM
RSSI
AVCC
AGND
DGND
MIXVCC
LNAGND
LNA_IN
3. RF Front End
The RF front end of the receiver is a heterodyne configuration that converts the input signal into
a 1-MHz IF signal. According to
fier), LO (Local Oscillator), a mixer and RF amplifier.
The LO generates the carrier frequency for the mixer via a PLL synthesizer. The XTO (crystal
oscillator) generates the reference frequency f
erates the drive voltage frequency f
is divided by factor 64. The divided frequency is compared to f
tor. The current output of the phase frequency detector is connected to a passive loop filter and
thereby generates the control voltage VLF for the VCO. By means of that configuration, VLF is
controlled in a way that f
the following formula:
f
= f
XTO
LO
The XTO is a one-pin oscillator that operates at the series resonance of the quartz crystal.
According to
of that capacitor is recommended by the crystal supplier. The value of CL should be optimized
for the individual board layout to achieve the exact value of f
ing the system in terms of receiving bandwidth, the accuracy of the crystal and the XTO must be
considered.
4893A–RKE–11/05
BR_0
BR_1
ASK-
Dem_out
Demodulator
and data filter
RSSI
RSSI IF Amp
4. Order
LPF
3 MHz
IF Amp
VCO
LPF
3 MHz
f
LNA
64
Figure
2-2, the front end consists of an LNA (Low-Noise Ampli-
for the mixer. f
LO
/64 is equal to f
LO
XTO
/64
Figure
3-1, the crystal should be connected to GND via a capacitor CL. The value
ATA5744
DATA
Data interface
TEST
Test
MODE
DVCC
ENABLE
LFGND
Standby logic
LFVCC
XTO
XTO
LF
. The VCO (Voltage-Controlled Oscillator) gen-
XTO
is dependent on the voltage at pin LF. f
LO
by the phase frequency detec-
XTO
. If f
is determined, f
can be calculated using
LO
XTO
and hereby of f
. When design-
XTO
LO
LO
3