High Integrity FM Transceiver RS-MK-X2010
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Features
• Operation on 434.075, 868.40 and 914.5 MHz
• X2011 version includes integrated pcb loop
antenna (434 & 868 MHz versions)
• Double RF filtering = High Reliability RF Link
• Data rates to 20 kbps (Wide-band 64 kbps
version available to order)
• -112 dBm receiver sensitivity (434 version)
• CD and RSSI outputs
• Crystal stabilised accurate RF
• Hence narrower BW filter utilised
• Results in over 300m range
• EN 300 220-1, 300 683 & FCC compliant
• Immune to Tetra and High power Radio Amateur
Repeater Stations
Applications
• EPOS TERMINALS
• REMOTE TELEMETRY & TELECOMMAND
• REMOTE METER READING
• DOMESTIC AND COMERCIAL SECURITY
General Description
The WP-MK-X2010 radio transceiver module was
designed to provide reliable wireless operation at
moderate data rates for use throughout the world. Its
unique features of narrower RF channel bandwidths
and hence high interference rejection capability at
SAW module prices make the X2010 the ideal choice
for next generation applications.
Available for operation at the major frequency
allocations world-wide in the same package, these
modules have been designed to provide a reliable
wire free link for the next century, accounting for the
increased traffic from other legal users of the radio
spectrum.
The transmitter section uses a PLL design that
utilises a highly stable and accurate reference
crystal oscillator. This results in a RF transmission
tightly controlled in its frequency spread and over
its operating temperature range. This is exploited in
the receiver design.
The receiver section uses a single conversion
super-het design, again using PLL technology.
Hence narrower bandwidth RF filters are utilised
which result in superior rejection of interference as
well as providing good receiver sensitivity and
hence range.
High Integrity FM Transceiver RS-MK-X2010
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Absolute Maximum Ratings: Receiver
Operating temperature: -20°C to +55°C
Storage temperature: -40°C to +100°C
Supply Voltage 6V
Data Input: Vcc + 0,3v
RF Input 0 dBm
Electrical Characteristics:
Performance data measured at 20°C and +5 volt supply and RF = 434,075 MHz
pin min. typ. max. units notes
DC LEVELS
Supply voltage 17 4,5 5 5,5 V
Supply current (receiver enabled) 17 7 mA
Supply current (transmitter enabled) 17 8 mA
Leakege current with Vcc connected 1 uA
Data input/output high 12,14 0,7xVcc Vcc V
Data input/output low 12,14 0 0,0xVcc V
RF
Receiver sensitivity (12 dB SINAD on AF
output) 13 -112 dBm
Image rejection 50 dB
RF power out (transmitter) 1 mW
FM Deviation +/-10 KHz
Initial frequency accuracy ±100 Hz
Overall frequency accuracy +/-2 KHz
Max RF input to receiver 0 dBm
E.M.C.
Spurious responses upto 1GHz <-36 dB
LO leakage, conducted <60 dBm
LO leakage, radiated <60 dBm
DYNAMIC TIMING
RX enable to valid RSSI / CD mS
RX enable to stable receiver data out 5 mS
TX enable to full RF out 5 mS
Minimum data pulse width 50 uS
Data Bit rate 50 20000 bps 2
Notes
1) Over full operating temperature range
2) 1 Hz = 2 bps
High Integrity FM Transceiver RS-MK-X2010
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Mechanical description
5.0
0.8
2.0 8.5
1.3
30.4
33.0
22.0
Pin 1 18
17
16
15
14
13
12
11
10
1
2
3
4
5
6
7
8
9
Notes
• Recommended PCB hole diameter to accommodate the connecting pins = 1.2mm
• All dimensions are in mm
• Distance between each connecting pin = 2.54mm
• Pins 4,5,6 and 7 are internally floating not connected to anything
High Integrity FM Transceiver RS-MK-X2010
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Mechanical description
18
17
16
15
14
13
12
11
10
1
7
8
9
Loop Antenna
3
23
48
33
Notes
• All dimensions are in mm
• Recommended PCB hole diameter to accommodate the connecting pins = 1.2mm
• Distance between each connecting pin = 2.54mm
High Integrity FM Transceiver RS-MK-X2010
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Pin Functional description WP-MK-X2010 & WP-MK-X2011
Pin No. Description Details
1 & 3 RF Ground For best results, these pins should be connected to the ground plane
against which the antenna radiates
2 Antenna Nominal 50 ohm input/output impedance capacitively isolated from
internal circuit. See application notes for antenna examples
9, 10, 18 Ground Supply ground points
4, 5, 6 & 7 NC Not connected internally
7 (WP-MK-X2011) Gnd RF gnd only on X2011
8 RSSI Receiver signal strength indicator
DC voltage proportional to RF signal strength being received
11 CD Digital Carrier Detect Output – Active Low
12 RxD Receiver digital data output (CMOS logic out) representing true data as
supplied to the transmitter
13 AF Audio Frequency Output
14 TxD Data input to the transmitter can be directly interfaced to CMOS logic
drive operating on the same supply voltage as the transceiver
15 Tx Enable Active Low
Applying Vcc disables the transmitter
16 Rx Enable Active Low
Applying Vcc places the receiver in sleep mode
17 Vcc Supply voltage range from 4.5 to 5.5volts. Note that module is not
reverse polarity protected
State Table
Tx (Pin 15) Rx (Pin 16) Mode
1 1 Power down mode. Supply current < 1uA
1 0 Receiver only enabled. Data, AF, CD and RSSI outputs valid
0 1 Transmitter only enabled. Tx data input valid
0 0 Tx and Rx on. Avoid this mode as it will eventually destroy the module
High Integrity FM Transceiver RS-MK-X2010
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RSSI Values
The RSSI output provides a dc voltage that is
proportional to the RF signal strength picked up on the
antenna (pin 2) port of the module.
The table below gives typical values of RSSI for varying
degrees of RF signal strength applied.
RF Input (dBm) RSSI (V)
-105 0,82
-100 0,88
-90 1,12
-80 1,43
-70 1,75
-60 2,06
-50 2,36
-40 2,57
-30 2,6
-20 2,6
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 achieved with either a straight piece of
wire, rod or PCB track @ ¼ wavelength (15.5cm @
433.92MHz). Further range may be achieved if the ¼
wave antenna is placed perpendicular in the middle
of a solid earth plane measuring at least 16cm radius.
In this case, the antenna should be connected to the
module via some 50 ohm characteristic impedance
coax.
RF
RF
Helical Antenna
Whip Antenna
34mm @ 433MHz
17 turns equally spaced
∅
= 5mm (inside)
15.5cm @ 433MHz
Figure 2: Antenna Configurations To Be Used
With The WP-MK-X2010
High Integrity FM Transceiver RS-MK-X2010
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Ordering Information
Standard Product;
Part No Description
WP-MK-X2010-434 434,075 MHz Transceiver
WP-MK-X2010-868 868,40 MHz Transceiver
WP-MK-X2010-914 914,5 MHz Transceiver
WP-MK-X2011-434 Integrated Antenna 434,075 MHz Transceiver
WP-MK-X2011-868 Integrated Antenna 868,40 MHz Transceiver
Note: 868 and 914 versions available November 2001.
Round Solutions Ltd.
Niederlassung Deutschland
Zaunweg 4
D-63303 Dreieich
Tel. 06103 960510
Fax. 06103 960509
www.roundsolutions.com
info@roundsolutions.com
