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RX2G-434-64

型号：

RX2G-434-64

品牌：

RADIOMETRIX[ RADIOMETRIX LTD ]

页数：

7 页

PDF大小：

242 K

下载PDF手册
Radiometrix  
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England  
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233  
Issue 1, 20 May 2009  
TX2S/TX3S  
UHF FM Data Transmitter Module  
The TX2S module is a miniature  
PCB mounting UHF radio  
transmitter which enable the simple  
implementation of a data link at up  
to 40 kbps at distances up to 75  
metres in-building and 300 metres  
open ground.  
Figure 1: TX2S-433-40-3V-SM  
Features  
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Conforms to ETSI EN 300 220-3 (radio) and EN 301 489-3 (EMC) standards  
Data rates up to 40 kbps  
Usable range up to 300 m  
Versions available on 433.92MHz, 434.42MHz and 869.85 (TX3S)  
Small size: 20x10x2mm (without can), 20x10x2.6mm(with can)  
Available for operation at 433.92MHz, 434.42MHz and 869.85MHz in Europe including the UK, both  
modules combine full internal filtering to ensure EMC compliance by minimising spurious radiations and  
susceptibilities. The TX2S/TX3S module will suit one-to-one and multi-node wireless links in applications  
including car and building security, EPOS and inventory tracking, remote industrial process monitoring  
and computer networking. Because of it’s small size and low power requirements, it is ideal for use in  
portable, battery-powered wireless devices such as remote control key fob.  
Technical Summary  
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Crystal-locked PLL, FM modulated at up to 40kbps  
Operation from 2.2V to 4V  
Up to +4dBm (+10dBm variant on 433.92MHz)  
Improved frequency and deviation accuracy  
Harmonics @ <1GHz, -54dBm  
Applications  
•
•
•
•
•
•
•
Remote control key fobs  
EPOS and inventory tracking  
Industrial telemetry and telecommand  
Data loggers  
In-building environmental monitoring and control  
Car and building security and fire alarms  
Vehicle data up/download  
Evaluation Platform: Universal Evaluation kit +TX2S carrier  
Matching Receiver: RX2G-xxx-15 or RX2G-xxx-64  
Radiometrix Ltd, TX2S/TX3S Data Sheet  
page 1  
Functional description  
The TX2S transmitter module is a crystal based PLL controlled FM transmitter operating between 2.2V  
and 4V and is available on European licence exempt UHF frequencies. The TX2S module is type approved  
to EN 300 220-3 for European use and delivers nominally +0dBm at 7mA. The module measures 20 x 10 x  
2 mm.  
5
VCC 2.2 -- 4V  
433.92 MHz  
band pass  
filter  
ref  
osc  
35kHz  
LPF  
buffer  
32  
÷
φ
1
V C O  
4
RF out  
TXD  
Loop  
Filter  
2
RF gnd  
3
0V  
Fig. 2: TX2S block diagram  
Fig. 3: TX2S pinout  
Fig 4: physical dimensions  
Radiometrix Ltd, TX2S/TX3S Data Sheet  
page 2  
Pin description:  
RF GROUND (pins 2)  
RF ground, internally connected to the module screen and pin 3 (0V). These pins should be directly  
connected to the RF return path - e.g. coax braid, main PCB ground plane etc.  
RF OUT  
(pin 1)  
50Ω RF output to the antenna. Internally DC-isolated. See antenna section of apps notes for details of  
suitable antennas.  
VCC  
(pin 5)  
+2.2V to +4V DC supply. Max ripple content 0.1VP-P  
.
GROUND  
(pin 3)  
DC supply ground. Internally connected to pins 2 & 3.  
DATA (pin 4)  
DC-coupled modulation input. Accepts serial digital data at 0V to 4V levels.  
Absolute maximum ratings  
Survival Maximums:  
Exceeding the values given below may cause permanent damage to the module.  
Operating temperature-  
Storage temperature  
-20°C to +70°C  
-40°C to +100°C  
TX2S, all variants  
Vcc (pin 5)  
-0.3V to +4.0V  
Data input (pin 4)  
-0.3V to +4.0V  
RF out (pin 1)  
±50V DC 10dBm RF  
Performance Specifications: TX2S transmitter.  
(Temperature = 20C unless stated)  
pin min.  
typ.  
max. units  
notes  
DC LEVELS  
supply voltage  
5
2.2  
3.0  
4.0  
V
CURRENT & RF POWER  
TX2S-433-40-3V  
Supply current @ Vcc = 3V  
5
1
6
0
7
+2  
10  
+4  
mA  
dBm  
RF power  
@ Vcc = 3V  
1
RF  
harmonics @ < 1GHz  
harmonics @ > 1GHz  
initial frequency accuracy  
overall frequency accuracy  
1
1
-
-
-
-60  
-40  
+/-10  
+/-10  
-54  
-30  
+20  
+25  
dBm  
dBm  
kHz  
kHz  
1
1
-20  
-25  
-
FM deviation (+/-)  
Modulation bandwidth @ -3dB  
-
-
20  
DC  
27  
-
35  
20  
kHz  
kHz  
modulation distortion (THD)  
power up time to full RF  
-
-
-
-
5
1
10  
1.5  
%
ms  
Note: 1. Measured into a 50Ω load.  
Radiometrix Ltd, TX2S/TX3S Data Sheet  
page 3  
Power supply requirement  
The ripple/noise on the supply rail should be below 10mVp-p to avoid problems. If the quality of the supply  
is in doubt, it is recommended that a 10µF low-ESR tantalum or similar capacitor be added between the  
module supply pin (Vcc) and ground, together with a 10Ω series feed resistor between the Vcc pin and the  
supply rail.  
The TX2S incorporates a low voltage shutoff circuit, which prevents any possibility of erratic operation by  
disabling the RF output if the supply voltage drops below 2.2V (±5%). This feature is self-resetting, i.e.  
restoring the supply to greater than 2.2V will immediately restore full RF output from the module.  
TX2S modulation requirements  
The module will produce the specified FM deviation with a TXD input to pin 4 of 2 to 4V amplitude, i.e. 0V  
"low", 4V "high. Where standard 2-level digital data is employed with a logic "low" level of 0V ±0.2V, the  
logic "high" level applied to TXD may be any value between +2V and +4V for correct operation.  
Module mounting considerations  
Good RF layout practice should be observed – in particular, any ground return required by the antenna or  
feed should be connected directly to the RF GND pin at the antenna end of the module, and not to the 0V  
pin which is intended as a DC ground only. All connecting tracks should be kept as short as possible to  
avoid any problems with stray RF pickup.  
If the connection between module and antenna does not form part of the antenna itself, it should be made  
using 50Ω microstrip line or coax or a combination of both. It is desirable (but not essential) to fill all  
unused PCB area around the module with ground plane.  
Warning: DO NOT wash the module. It is not hermetically sealed.  
Radiometrix Ltd, TX2S/TX3S Data Sheet  
page 4  
Antenna requirements  
Three types of integral antenna are recommended and approved for use with the module:  
0.5 mm enameled copper wire  
close wound on 3.2 mm diameter former  
RF  
433 MHz = 24 turns  
A. Helical antenna  
Feed point 15% to 25% of total loop length  
track width = 1mm  
RF-GND  
4 to 10 cm2 inside area  
C2  
C1  
RF  
C3  
C4  
B. Loop antenna  
16.4cm  
wire, rod, PCB-track or a combination  
of these three  
RF  
433 MHz = 16.4 cm total from RF pin.  
C. Whip antenna  
Fig.5: Antenna  
A
helical  
**  
**  
***  
**  
B
loop  
C
whip  
***  
***  
*
Ultimate performance  
Easy of design set-up  
Size  
Immunity proximity effects  
Range open ground to similar antenna  
(for TX2S-433-40-3V & RX2G-433-15)  
*
*
**  
***  
100m  
*
200m  
300m  
Antenna selection chart  
A) Helical  
Wire coil, connected directly to pin 2, open circuit at other end. This antenna  
is  
very  
efficient given it's small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the  
wire length or expand the coil for optimum results. The helical de-tunes badly with  
proximity to other conductive objects.  
B) Loop  
C) Whip  
A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed  
from pin 2 at a point 20% from the ground end. Loops have high immunity to proximity de-  
tuning.  
This is a wire, rod, PCB track or combination connected directly to pin 2 of the module.  
Optimum total length is 15.5cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end well  
away from metal components to prevent serious de-tuning. Whips are ground plane  
sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small  
and plastic cased  
The antenna choice and position directly controls the system range. Keep it clear of other metal in the  
system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is  
often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an  
internal antenna must be used try to keep it away from other metal components, particularly large ones  
like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as  
the antenna itself  
Radiometrix Ltd, TX2S/TX3S Data Sheet  
page 5  
Duty Cycle requirements  
The duty cycle is defined as the ratio, expressed as a percentage, of the maximum transmitter “on” time on  
one or more carrier frequencies, relative to a one hour period. Where an acknowledgement message is  
required, the additional transmitter “on” time shall be included.  
There is a 10% duty cycle restriction on 433.050-434.790 MHz band in most of the EU member states.  
The TX2S-433 is an RF module intended to be incorporated into a wide variety of applications and  
finished products, Radiometrix has no control over the end use of the TX2S-433.The harmonised band  
433.050 to 434.790 MHz as detailed in Annex 1 Band E of CEPT/ERC Recommendation 70-03 (which can  
be downloaded at http://www.ero.dk/scripts/docmanag98/dm.dll/QueryDoc?Cat=Recommendation)  
has list of countries where Duty Cycle restriction apply.  
Module users should, therefore, ensure that they comply with the stated Duty Cycle requirements of the  
version of CEPT/ERC Recommendation 70-03 in place at the time of incorporation of the TX2S-433 into  
their product. It should be noted that the stated Duty Cycle must not be exceeded otherwise any approval  
granted for the TX2S-433 will be invalidated.  
Variants and ordering information  
The TX2S is manufactured in several variants depending on their operating frequency:  
The standard frequency is 433.92MHz.  
TX2S-433-40-3V  
TX2S-434-40-3V  
TX3S-869-40-3V  
433.92MHz  
434.42MHz  
869.85MHz  
The standard TX2S is supplied with mounting pins but without the metal shield. A version  
without mounting pins, suitable for surface mount assembly, is also available. For other  
variants, please contact sales department.  
Matching receivers:  
RX2G-433-15  
RX2G-433-64  
RX2A-433-10  
RX2A-433-64  
433.92MHz, 15kb/s  
433.92MHz, 64kb/s  
433.92MHz, 10kb/s  
433.92MHz, 64kb/s  
RX2G-434-15  
RX2G-434-64  
RX2A-434-10  
RX2A-434-64  
434.42MHz, 15kb/s  
434.42MHz, 64kb/s  
434.42MHz, 10kb/s  
434.42MHz, 64kb/s  
RX3G-869.85-15  
RX3G-869.85-64  
RX3A-869.85-10  
RX3A-869.85-64  
869.85MHz, 15kb/s  
869.85MHz, 64kb/s  
869.85MHz, 10kb/s  
869.85MHz, 64kb/s  
Evaluation Platform: Universal Evaluation kit +TX2S carrier  
Radiometrix Ltd, TX2S/TX3S Data Sheet  
page 6  
Radiometrix Ltd  
Hartcran House  
231 Kenton Lane  
Harrow, Middlesex  
HA3 8RP  
ENGLAND  
Tel: +44 (0) 20 8909 9595  
Fax: +44 (0) 20 8909 2233  
sales@radiometrix.com  
www.radiometrix.com  
Copyright notice  
This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or  
in part must give clear acknowledgement to the copyright owner.  
Limitation of liability  
The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the  
right to make changes or improvements in the design, specification or manufacture of its subassembly products  
without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or  
circuit described herein, nor for any infringements of patents or other rights of third parties which may result from  
the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any  
particular application. These radio devices may be subject to radio interference and may not function as intended if  
interference is present. We do NOT recommend their use for life critical applications.  
The Intrastat commodity code for all our wireless radio modules is: 8542 6000  
R&TTE Directive  
After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the  
R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the  
essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment.  
Further details are available on The Office of Communications (Ofcom) web site:  
http://www.ofcom.org.uk/radiocomms/ifi/  
Information Requests  
Ofcom  
European Radiocommunications Office (ERO)  
Peblingehus  
Riverside House  
Nansensgade 19  
2a Southwark Bridge Road  
London SE1 9HA  
Tel: +44 (0)845 456 3000 or 020 7981 3040  
Fax: +44 (0)20 7783 4033  
information.requests@ofcom.org.uk  
DK 1366 Copenhagen  
Tel. +45 33896300  
Fax +45 33896330  
ero@ero.dk  
www.ero.dk  
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