EW
N
Issue 1, 01 November 2007
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Preliminary data sheet
RMX2
Narrow Band Direct Interface Multi Channel Transceiver
The RMX2 is an ETSI EN 300 220-3
compliant UHF FM narrow band
semi-duplex radio data module. It is a
high
performance
transceiver
designed for use in industrial
applications requiring long range,
high performance and reliability.
The operating frequencies are
available in the 433.05-434.79MHz
European ISM band and 458.5-
459.1MHz UK SRD band allocations.
Figure 1: RMX2-433-10
Features
!
+10dBm (10mW) RF power, 3.0V @ 35mA operation
!
Programmable RF channel
!
Fast TX/RX switching time (5ms)
!
Receiver sensitivity -119dBm
!
Class one receiver performance
!
ETSI EN 300 220-3, EN 301 489-3 compliant
RMX2 is a narrowband multichannel module with 25 kHz channel steps, but still
achieves sub-10mS TX/RX switching speed, making it an ideal RF unit for inclusion
in feedback systems.
The narrow band technique used in RMX2 enables high interference rejection and
concurrent operation with multiple modules.
Applications
Telemetry
!
Water level monitor for rivers, dams, etc.
!
Monitoring systems for environmental data such as temperature, humidity, etc.
!
Transmission of measurement data (pressure, revolution, current, etc) to PC
!
Security alarm monitoring
Telecontrol
!
Industrial remote control systems
!
Remote control systems for factory automation machines
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 1/12
Figure 2: RMX2 block diagram
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 2/12
12
3
50
9
2.5
5.1
1
2.5
RXM2-433-10
UHF Multi Channel
Narrow Band Transceiver
CLK
DATA
LE
LD
RSSI
D0
D1
22.5
0.7
18
2.5
22.5
18
7.13
12.7
9.67
2.54
2.54
Reference hole position for PCB mounting (bottom view)
recommended PCB hole size: 1.2 mm
pin pitch: 2.54 mm
module footprint size: 30 x 50 mm
Figure 3: Pinouts and dimensions
Radiometrix Ltd
RMX2-433-10 Data sheet
30
15.24
7.13
Page 3/12
CONDENSED SPECIFICATIONS
All ratings at 25°C unless otherwise noted
Parameter
General characteristics
Operating frequency range
Channel step
Frequency stability
Data rate
PLL reference frequency
Operating voltage range
Supply Current
Operating temperature range
Dimensions
Transmitter section
RF output power
Deviation (Digital In)
Deviation frequency
characteristics
TX S/N
Spurious emission
Adjacent channel leakage power
Total distortion and noise
Switching time RX to TX
Lock time
Rating
433.05 - 434.775 MHz
458.5-459.1MHz
Programmable (PLL IC:
Fujitsu MB15E03SL)
±3ppm
9600 bps max
21.25 MHz
3 – 15 V
35mA (TX)
24mA (RX)
- 20 to + 70 °C
30 x 50 x 9 mm
Conditions
European ISM band (RMX2-433-10)
UK SRD allocation (RMX2-458-10)
-20 to +70 °C
Input data pulse width: Min 104µs, Max 5ms
10mW
±1dB
2.4kHz
±0.3kHz
±
3dB
-30dB
<-54dBm
<-40dBm
-37dBm
30dB
5 - 10ms
30 – 40ms
10 – 20ms
At 434.0MHz / 458.7MHz, Antenna impedance 50Ω
PN9, 9600 bps, LPF 20 kHz
DC to 4800Hz
1kHz, Deviation =
±2.4kHz
CCITT filter
<1GHz, non-harmonic spurii
2nd and 3rd harmonics
CH 25kHz, BW = 16kHz, PN9, 9600 bps
1kHz, Deviation =
±2.4kHz,
CCITT filter
RX
#
TX
* 1
Free Run
#
TX
* 2
25kHz channel shift
* 3
Receiver section
Receiver Sensitivity
Receiver S/N
Distortion
-119dBm (AF OUT)
35dB
5%
All spurious responses
Intermodulation
Adjacent channel selectivity
Blocking
Switching time TX to RX
Lock Time
Better than
60dB
Better than 50dB
65dB
>84dBm
5 - 10 ms
30 - 40 ms
10 - 20 ms
1kHz, Deviation
±2.4kHz,
CCITT filter
1kHz, Deviation
±2.4
kHz, CCITT filter,
RF level = -30dBm
1kHz, Deviation
±2.4kHz,
CCITT filter, RF level=-
30dBm
2 signal method, Jamming signal = FM
2 signal method
2 signal method, ± 25kHz
Jamming signal = FM
± 1, 2, 5, 10 MHz
TX
#
RX
* 1
Free Run
#
RX
* 2
25kHz channel shift
* 3
NOTES:
1.
2.
3.
Time until TX frequency or 1st Local frequency reach a steady frequency ±1.5ppm
Time until TX frequency or 1st Local frequency reach a steady frequency ±1.5ppm after PLL setting data
is set.
Time until TX frequency or 1st Local frequency reach a steady frequency ±1.5ppm after setting PLL
setting data to change the frequency for 25kHz
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 4/12
up to 1200MHz
VCO
2.2kΩ
Fin
Xf in
GND
CLK
Data
LE
PS
ZC
LD/f out
P
R
2.2kΩ
2.2kΩ
2.2kΩ
CLK
DATA
LE
LPF
+2.8V
D0
VCC
Vp
LD
Reference Oscillator
21.25MHz
OSC out
OSC in
RMX2-XXX-10
Control pin name
Figure 4: PLL IC Control
RMX2 has an internal PLL frequency synthesizer as shown in Figure 1. Channel frequency is set by
loading data directly into the registers of the controlling IC over a simple, 3 wire serial bus (interface
pins CLK, LE, DATA). Also RMX2 has a Lock Detect (LD) terminal that shows the lock status of the
frequency. These signal lines are connected directly to the PLL IC through a 2.2kΩ resistor.
The interface voltage of RMX2 is 2.8 V, so the control voltage must be the same. RMX2 comes equipped
with a Fujitsu MB15E03SL PLL IC. Please refer to the manual of the PLL IC.
http://www.fujitsu.com/downloads/MICRO/fme/pll/e421359.pdf
The following is a supplementary description related to operation with RMX2. In this description, the
same names and terminology as in the PLL IC manual are used, so please read the manual beforehand.
How to calculate the setting values for the PLL register
The PLL IC manual shows that the PLL frequency setting value is obtained with the following
equation.
f
VCO
=
f
vco
:
N:
A:
f
osc
:
R:
M:
[
(
M
×
N
)
+
A
]
×
f
OSC
R
N > M
2
Equation
1
Output frequency of external Voltage Controlled Oscillator (VCO)
Preset divide ratio of binary 11-bit programmable counter (3 to 2,047)
Preset divide ratio of binary 7-bit swallow counter (0
≤
A
≤
127)
Output frequency of the reference frequency oscillator
Preset divide ratio of binary 14-bit programmable reference counter (3 to 16,383)
Preset divide ratio of the dual modulus prescaler (64 or 128)
Because of the circuitry used in the RMX2, the frequency programmed into the PLL must be 21.7MHz
below the desired channel frequency. There is no need to re-program when switching between transmit
and receive modes.
Therefore the expected value of the frequency generated at VCO (fexpect) is as below.
fvco = fexpect = (fch – 21.7MHz)
Equation 2
The PLL generates channel frequencies as multiples of a 'comparison' frequency. This phase
comparison frequency (fcomp) is made by dividing the frequency input to the PLL from the reference
oscillator by reference counter R. The RMX2 uses a 21.25 MHz TCXO for the reference clock fosc.
fcomp can be either 12.5kHz or 25 kHz.
The above equation 1 results in the following with n = M x N + A, where “n” is the number for division.
f
VCO
=
n
×
f
comp
Equation 3
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 5/12
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