RMX2 Datasheet PDF - Radiometrix
| Part Number | RMX2 | |
| Description | Narrow Band Direct Interface Multi Channel Transceiver | |
| Manufacturers | Radiometrix | |
| Logo |  |
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There is a preview and RMX2 download ( pdf file ) link at the bottom of this page. Total 12 Pages | ||
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www.DataSheet.co.kr
NEW Radiometrix
Issue 1, 01 November 2007
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.
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
Figure 1: RMX2-433-10
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
Datasheet pdf - http://www.DataSheet4U.net/
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up to 1200MHz
VCO
LPF
+2.8V
Reference Oscillator
21.25MHz
Fin CLK
Xf in
Data
GND
LE
D0 PS
VCC
ZC
Vp LD/f out
OSC out
P
OSC in
R
2.2kΩ
2.2kΩ
2.2kΩ
CLK
DATA
LE
2.2kΩ
LD
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.
fVCO
=
[(M
× N)+
R
A]×
f OSC
N > M2
Equation 1
fvco : Output frequency of external Voltage Controlled Oscillator (VCO)
N: Preset divide ratio of binary 11-bit programmable counter (3 to 2,047)
A: Preset divide ratio of binary 7-bit swallow counter (0 ≤ A ≤ 127)
fosc: Output frequency of the reference frequency oscillator
R: Preset divide ratio of binary 14-bit programmable reference counter (3 to 16,383)
M: 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.
fVCO = n × f comp
Equation 3
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 5/12
Datasheet pdf - http://www.DataSheet4U.net/
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for RMX2 electronic component. |
| Information | Total 12 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ RMX2.PDF Datasheet ] | |
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