High Performance ASK Transceiver
TRA150D-050-5
Features
•
151.625 MHz (Other frequencies available 148MHz
to 152 MHz)
•
•
•
•
•
•
Data rates to 19.2 kbps
-105 dBm receiver sensitivity
RSSI output
Carrier Detect Output
CRYSTAL stabilised
Fast TX and RX settling and switching times
Applications
•
EPOS TERMINALS
•
REMOTE TELEMETRY & TELECOMMAND
•
•
•
REMOTE METER READING
DOMESTIC AND COMERCIAL SECURITY
GPS AND INVENTORY MANAGEMENT
General Description
The TRA150D radio transceiver module was designed to provide reliable wireless operation
at moderate data rates for use throughout the world.
The TRA150D is a low power ASK transceiver that has been designed to interface directly to
a micro controller.
The module has been optimised for fast turn on and exhibits a power down mode for low
current operation.
In conjunction with a high performance antenna, the unit has a typical range up to several km.
The module is compatible with our WDXX range of controllers for evaluation, development
and turnkey solutions.
The receiver section uses a single conversion super-het design,
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High Performance ASK Transceiver
TRA150D-050-5
Absolute Maximum Ratings: Transceiver
Operating temperature:
Storage temperature:
Supply Voltage
Data input
RF Input
-20°C to +80°C
-40°C to +100°C
6V
Vcc + 0.3v
0dBm
Electrical Characteristics:
Performance data measured at 20 C and +5 volt supply and RF = 151.625 MHz. version
o
pin
DC LEVELS
Supply voltage
Supply current (receiver enabled)
Supply current (transmitter enabled)
Supply current (Power down mode)
Data input/output high
Data input/output low
RF
Receiver sensitivity (12 dB SINAD)
Image rejection
RF power out (transmitter)
ASK depth
Overall frequency accuracy
RF input compression level
E.M.C.
Spurious responses upto 1GHz
LO leakage, conducted
LO leakage, radiated
DYNAMIC TIMING
RX enable to valid RSSI / CD
RX enable to stable receiver data out
TX enable to full RF out
Allowable data pulse widths
Data Bit rate
Notes
7
7
7
2,4
2,4
min.
4.75
typ.
5
35
85
250
Max.
5.25
units
V
mA
mA
uA
V
V
notes
0.7xVcc
0
Vcc
0.0xVcc
2
-105
50
50
25
+/-20
-30
-110
dBm
dB
mW
dB
KHz
dBm
35
<-30
<50
<50
dB
dBm
dBm
100
100
80
1
50
100
65,000
uS
uS
uS
uS
bps
1
1) The data slicer is optimised for a 50:50 duty cycle hence for reliable communications data
should be encoded using a suitable scheme such as Manchester Encoding, although pulse
width modulation up to 70:30/30:70 can also be used.
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High Performance ASK Transceiver
TRA150D-050-5
Pin No.
Pin Name
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D1
+5V
D2
A1
D3
A2
D4
A3
D5
A4
D6
GND
D7
GND
D8
GND
Digital IO (RC1)
VCC, DC Power source (200mA max)
Digital IO (RC2)
Digital IO (RB7)
Digital IO (RC3)
Digital IO (RB6)
Digital IO (RC4)
Digital IO (RB5)
Digital IO (RC5)
Digital IO (RB4)
Digital IO (RB5)
Common, 0V
Digital IO (RB6)
Common, 0V
Digital IO (RB7)
Common, 0V
RF in Vs RSSI - TRA150D-050-5
1.2
1
0.8
RF in(dBm)
0.6
Series1
0.4
0.2
0
-120 -115 -110 -105 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30
RSSI(V)
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High Performance ASK Transceiver
TRA150D-050-5
MECHANICAL DETAILS
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High Performance ASK Transceiver
TRA150D-050-5
Application Information
Antenna Design
The design and positioning of the antenna is as crucial as the module performance
itself in achieving a good wireless system range. The following will assist the
designer in maximising system performance.
The antenna should be kept as far away from sources of electrical interference as
physically possible. If necessary, additional power line decoupling capacitors should
be placed close to the module.
The antenna ‘hot end’ should be kept clear of any objects, especially any metal as this
can severely restrict the efficiency of the antenna to receive power. Any earth planes
restricting the radiation path to the antenna will also have the same effect.
Best range is achieve with a ground independent, 3dB or better gain, ground-
independent antenna.
Good range can be achieved with either a straight piece of wire, rod or PCB track @
¼ wavelength (500mm). Further range may be achieved if the ¼ wave antenna is
placed perpendicular in the middle of a solid earth plane measuring at least 500mm
radius. In this case, the antenna should be connected to the module via some 50 Ohm
characteristic impedance coax
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