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RX2A-433-10

型号：

RX2A-433-10

描述：

UHF FM数据发送器和接收器模块[ UHF FM Data Transmitter and Receiver Modules ]

品牌：

RADIOMETRIX[ RADIOMETRIX LTD ]

页数：

11 页

PDF大小：

270 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, 10 May 2006  
TX2A/RX2A  
UHF FM Data Transmitter and Receiver Modules  
The TX2A and RX2A data link  
modules are  
a
miniature PCB  
mounting UHF radio transmitter  
and receiver pair which enable the  
simple implementation of a data  
link at up to 64 kbps at distances up  
to 75 metres in-building and 300  
metres open ground.  
Figure 1: TX2A-433-64 & RX2A-433-64  
Features  
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CE certified by independent Notified Body  
Verified to comply with harmonised radio standard EN 300 220-3 and EMC standard EN 301 489-  
3 by accredited Test Laboratory  
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Data rates up to 64 kbps  
Usable range up to 300 m  
Versions available on 433.92MHz and 434.42MHz  
Fully screened  
Available for operation at 433.92MHz or 434.42MHz in the UK and Europe, both modules combine full  
screening with extensive internal filtering to ensure EMC compliance by minimising spurious radiations  
and susceptibilities. The TX2A and RX2A modules 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 their small size and low power requirements, both  
modules are ideal for use in portable, battery-powered applications such as hand-held terminals.  
Technical Summary  
Transmitter - TX2A  
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Crystal-locked PLL, FM modulated at up to 64 Kbps  
Operation from 2.2V to 16V (Dependent on version)  
+10dBm on 433.92MHz  
High efficiency, >30%, DC to RF  
Improved frequency and deviation accuracy  
2nd harmonic, > -60dBc  
Receiver - RX2A  
ꢀ
ꢀ
ꢀ
ꢀ
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Single conversion FM superhet  
SAW front end filter gives >50dB image rejection  
Operation from 2.7V to 16V @ 12mA  
Built-in regulator for improved stability and supply noise rejection  
-101dBm sensitivity @ 1ppm BER, 64kb/s version  
-108dBm sensitivity @ 1ppm BER, 10kb/s version  
RSSI output with 60dB range  
Extremely low LO leakage, <-100dBm  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 1  
Functional description  
The TX2A transmitter module is a crystal based PLL controlled FM transmitter operating between 2.2V  
and 16V and is available in 433.92MHz. The TX2A module is type approved to EN 300 220-3 for European  
use and delivers nominally +10dBm at 11mA. The module measures 32 x 12 x 3.8 mm.  
The RX2A module is a single conversion FM superhet receiver capable of handling data rates of up to  
64kbps. It will operate from a supply of 2.7V to 16V and draws 10mA when receiving. The RX2A features  
a fast power-up time for effective duty cycle power saving and a signal strength (RSSI) output with 60dB  
of range. Full screening and a SAW front-end filter give good immunity to interference. The SIL style  
RX2A measures 48 x 17.5 x 4.5 mm excluding the pins.  
TX2A transmitter  
supply  
5
regulator  
2.2 -- 16V  
4
En  
433.92 MHz  
band pass  
filter  
ref  
osc  
35kHz  
LPF  
buffer  
32  
÷
φ
2
V C O  
7
RF out  
TXD  
Loop  
Filter  
3
RF gnd  
6
1
0V  
Fig. 2: TX2A block diagram  
3.8 mm  
32 mm  
Pin description:  
RF GND  
(pins 1&3)  
12.0  
mm  
12.5  
mm  
RF ground, internally connected to the module  
screen and pin 6 (0V). These pins should be  
directly connected to the RF return path - e.g.  
coax braid, main PCB ground plane etc.  
Radiometrix  
TX2A  
PCB level  
RF OUT  
(pin 2)  
1 = RF GND  
2 = RF OUT  
3 = RF GND  
4 = En  
15.24 mm  
50Ω RF output to the antenna. Internally DC-  
isolated. See antenna section of apps notes for  
details of suitable antennas.  
2
3
4
5
6
7
1
5 = Vcc  
6 = 0V  
7 = TXD  
En  
(pin 4)  
7 holes, 0.7 mm dia, pin spacing 2.54 mm  
Tx enable. <0.15V shuts down module (current  
<1µA). >1.7V enables the transmitter.  
Impedance ~1MΩ. Observe slew rate  
requirements (see apps notes).  
Fig 3: TX2A physical dimensions  
Vcc  
(pin 5)  
+2.2V to +16V DC supply. Max ripple content 0.1VP-P. Decoupling is not generally required.  
0V (pin 6)  
DC supply ground. Internally connected to pins 1 & 3 and module screen.  
TXD (pin 7)  
DC-coupled modulation input. Accepts serial digital data at 0V to 2.5V levels.  
See applications notes for suggested drive methods. Input is high impedance (>100kΩ).  
Notes: 1. The 3V and 5V supply variant TX2As intended for direct replacement to our SAW based TX2  
modules and do not have internal regulator. They also have identical pin out as of TX2, hence lack  
pin 3 (GND) and pin 4 (Enable).  
2. The TXD input of 3V and 5V versions require serial digital data at 0-Vcc levels. i.e. 0-3V and 0-  
5V respectively  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 2  
RX2A receiver  
3
433MHz  
SAW BPF  
10.7MHz IF filter  
RSSI  
MIXER  
10.7MHz  
ceramic  
discriminator  
IF2/Lim  
10.7MHz  
IF1  
10.7MHz  
LNA 2  
LNA 1  
1
RF in  
Audio LPF  
(fRF - 10.7MHz)  
AF  
buffer  
6
AF out  
CL  
16  
VCO  
data  
slicer  
7
RXD  
XTAL OSC.  
RT  
CT  
10k  
Ω
+2.8V  
Low  
Loop filter  
regulated  
to circuit  
5
V
Crystal  
26/28MHz detector  
Phase  
dropout  
regulator  
cc  
(Fixed frequency PLL Osc.)  
4
0V  
2
RF gnd  
Figure 4: RX2A Block diagram  
48 mm  
4.5 mm  
Pin description:  
RF IN  
(pin 1)  
50Ω input from the antenna, DC isolated  
RX2A  
Radiometrix  
RF GND  
(pin 2)  
RF ground pin, internally connected to  
the module screen and pin 4 (0V). This  
pin should be connected to the RF return  
path (coax braid, main PCB ground plane  
etc.)  
PCB level  
30.48 mm  
1 = RF IN  
2 = RF GND  
3 = RSSI  
4 = 0V  
1
2
3
4
5
6
7
5 = Vcc  
6 = AF out  
7 = RXD  
7 holes of 0.7 mm dia. pin spacing 2.54mm  
Figure 5: Physical dimensions  
Received signal strength indicator with 60dB range. See page 4 for typical characteristics.  
RSSI  
(pin 3)  
0V  
(pin 4)  
DC supply ground. Internally connected to pin 2 and module screen.  
Vcc  
(pin 5)  
+2.7V to +16.0V DC supply. Max ripple content 0.1Vp-p. Decoupling is not generally required.  
AF out(pin 6)  
Buffered and filtered analogue output from the FM demodulator. Standing DC bias 1.1V approx. External  
load should be >10k // <100pF.  
RXD  
(pin 7)  
Digital output from the internal data slicer. The data is a squared version of the signal on pin 6 (AF) and  
is true data, i.e. as fed to the transmitter. Output is “open-collector” format with internal 10k pull-up to  
Vcc (pin 5).  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 3  
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  
TX2A, all variants  
Vcc (pin 3)  
Data input (pin 5)  
-0.3V to +16.0V  
+/- 7V  
RF out (pin 2)  
±50V DC 10dBm RF  
RX2A all variants  
Vcc (pin 5)  
-0.V to +16V  
RSSI, AF, RXD (pins 3,6,7)  
-0.1V to + 3V  
RF IN (pin 1)  
±8V DC, +10dBm RF  
Performance Specifications: TX2A transmitter.  
(Temperature = 20C unless stated)  
pin min.  
typ.  
max. units  
notes  
DC LEVELS  
supply voltage  
supply voltage  
supply voltage  
3
3
3
2.2  
4.0  
3
3.0  
5.0  
-
4.0  
6.0  
16  
V
V
V
-3V version  
-5V version  
STD  
CURRENT & RF POWER  
TX2A-433-64-3V  
supply current @ Vcc = 3V  
3
2
9
+8  
11  
+10  
13  
+12  
mA  
dBm  
RF power  
@ Vcc = 3V  
1
1
1
TX2A-433-64-5V  
supply current @ Vcc = 5V  
3
2
9
+8  
11  
+10  
13  
+12  
mA  
dBm  
RF power  
@ Vcc = 5V  
TX2A-433-64-STD  
supply current @ Vcc = 5V  
3
2
9
+8  
11  
+10  
13  
+12  
mA  
dBm  
RF power  
@ Vcc = 5V  
RF  
2nd harmonic  
harmonics @ > 1GHz  
initial frequency accuracy  
overall frequency accuracy  
2
2
-
-
-
-70  
-60  
+/-10  
+/-10  
-54  
-40  
+20  
+25  
dBc  
dBc  
kHz  
kHz  
1
1
-20  
-25  
-
FM deviation (+/-)  
Modulation bandwidth @ -3dB  
-
-
20  
DC  
27  
-
35  
35  
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, TX2A/RX2A Data Sheet  
page 4  
Performance specifications: RX2A  
(Vcc = 5.0V / temperature = 20oC unless stated)  
pin min.  
typ.  
max units  
notes  
DC supply  
Supply voltage  
Supply current  
5
5
2.7  
11  
5.0  
11.6  
16.0  
13  
V
mA  
1
RF/ IF  
RF sensitivity for 10dB (S+N/N)  
RF sensitivity for 10dB (S+N/N)  
RF sensitivity for 1ppm BER  
RF sensitivity for 1ppm BER  
RSSI range  
IF bandwidth  
Image rejection  
½-IF spurious rejection  
1,6  
1,6  
1,7  
1,7  
1,3  
-
-
-
-
-
-
-
50  
-
-115  
-108  
-108  
-101  
60  
180  
53  
94  
-
-
-
-
-
-
-
-
dBm  
dBm  
dBm  
dBm  
dB  
kHz  
dB  
dB  
10kb/s version  
64kb/s version  
10kb/s version  
64kb/s version  
1
1
LO leakage, conducted  
1
-
-120  
-100  
dBm  
Baseband  
Baseband bandwidth @ -3dB  
Baseband bandwidth @ -3dB  
AF level  
DC offset on AF out  
Distortion on recovered AF  
Ultimate (S+N)/N  
6
6
6
6
6
0
0
-
-
-
7.8  
50  
-
1.75  
5
kHz  
kHz  
mVP-P  
V
%
dB  
10kb/s version  
64kb/s version  
500  
1.1  
1
40  
-
2
3
3
0.45  
-
-
-
6
6,7  
-
Load capacitance, AFout/RXD  
100  
pF  
DYNAMIC TIMING  
Power up with signal present  
Power up to valid RSSI  
Power up to stable data  
Power up to stable data  
3,5  
5,7  
5,7  
-
-
-
1
10  
5
-
30  
10  
ms  
ms  
ms  
3, 10kb/s version  
3, 64kb/s version  
Signal applied with supply on  
RSSI response time (rise/fall)  
Signal to stable data  
µs  
ms  
ms  
1,3  
1,7  
1,7  
-
-
-
100  
5
5
-
30  
10  
3, 10kb/s version  
3, 64kb/s version  
Signal to stable data  
Time between data transitions  
Time between data transitions  
Mark:space ratio  
7
7
7
0.1  
15.6  
20  
-
-
50  
15  
1500  
80  
ms  
µs  
%
4, 10kb/s version  
4, 64kb/s version  
5
Notes: 1. Current increases at higher RF input levels (>-20dBm and above)  
2. For received signal with ±40kHz FM deviation.  
3. Typical figures are for signal at centre frequency, max. figures are for ±50kHz offset.  
4. For 50:50 mark to space ratio (i.e. square wave).  
5. Average over 30ms (10kb/s version) or 3ms (64kb/s version) at maximum data rate.  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 5  
Power supply requirement  
The standard TX2A and the RX2A modules incorporate a built-in regulator which delivers a constant 2.8V  
to the module circuitry when the external supply voltage is 2.85V or greater, with 40dB or more of supply  
ripple rejection. This ensures constant performance up to the maximum permitted supply rail and  
removes the need for external supply decoupling except in cases where the supply rail is extremely poor  
(ripple/noise content >0.1Vp-p).  
Note, however, that for supply voltages lower than 2.85V the regulator is effectively inoperative and  
supply ripple rejection is considerably reduced. Under these conditions 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 Enable pin allows the module to be turned on or off under logic control with a constant DC supply to  
the Vcc pin. The module current in power-down mode is less than 1µA.  
NOTE: If this facility is used, the logic control signal must have a slew rate of 40mV/ms or more. Slew  
rates less than this value may cause erratic operation of the on-board regulator and therefore the module  
itself.  
The TX2A 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.  
TX2A modulation requirements  
The module will produce the specified FM deviation with a TXD input to pin 7 of 2.5V amplitude, i.e. 0V  
"low", 2.5V "high". Reducing the amplitude of the data input from this value (usually as a result of  
reducing the supply voltage) reduces the transmitted FM deviation to typically ±25kHz at the lower  
extreme of 2.2V. The receiver will cope with this quite happily and no significant degradation of link  
performance should be observed as a result.  
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 +2.5V and +3V for correct operation. However, if using multi-  
level or analogue signalling the maximum positive excursion of the modulation applied to TXD must not  
exceed +2.5V or waveform distortion will result. If the input waveform exceeds this level a resistive  
potential divider should be used at the TXD input to reduce the waveform amplitude accordingly. This  
input is high impedance (>100kΩ) and can usually be ignored when calculating required resistor values.  
Received Signal Strength Indicator (RSSI)  
The module incorporates a wide range RSSI which measures the strength of an incoming signal over a  
range of approximately 60dB. This allows assessment of link quality and available margin and is useful  
when performing range tests.  
Please note that the actual RSSI voltage at any given RF input level varies somewhat between units. The  
RSSI facility is intended as a relative indicator only - it is not designed to be, or suitable as, an accurate  
and repeatable measure of absolute signal level or transmitter-receiver distance.  
The output on pin 3 of the module has a standing DC bias of 0.15V-0.45V (0.25V typ.) with no signal,  
rising to 0.9-1.3V (1.15V typ.) at maximum indication. The RSSI output source impedance is high (~50kΩ)  
and external loading should therefore be kept to a minimum.  
To ensure a fast response the RSSI has limited internal decoupling of 1nF to ground. This may result in a  
small amount of ripple on the DC output at pin 3 of the module. If this is a problem further decoupling  
may be added at the expense of response speed, in the form of a capacitor from pin 3 to ground. For  
example, adding 10nF here will increase RSSI response time from 100µs to around 1ms. The value of this  
capacitor may be increased without limit.  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 6  
Typical RSSI characteristic is shown below (this is for indicative purposes only and is not a guarantee of  
actual RSSI characteristics):  
1.2  
1.1  
1
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
-130 -120 -110 -100 -90 -80 -70 -60 -50  
RF level (dBm)  
Figure 6: Typical RSSI response  
Module mounting considerations  
The module may be mounted vertically or bent horizontal to the motherboard. 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 OV 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.  
The module may be potted if required in a viscous compound which cannot enter the screen can  
.
Warning: DO NOT wash the module. It is not hermetically sealed.  
optional solder joint  
for extra mechanical  
strength  
recommended horizotal mounting method  
vertical mounting method  
Figure 7: Module mounting options  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 7  
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.8: 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 TX2A-433-14-5V & RX2-433-14-5V)  
*
*
**  
***  
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, TX2A/RX2A Data Sheet  
page 8  
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 TX2A-433 is a 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 TX2A-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 TX2A-433 into  
their product. It should be noted that the stated Duty Cycle must not be exceeded otherwise any approval  
granted for the TX2A-433 will be invalidated.  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 9  
Variants and ordering information  
The TX2A is manufactured in several variants depending on their supply voltage and operating  
frequency:  
Supply voltage: 3V version: TX2A-433-64-3V  
5V version: TX2A-433-64-5V  
Direct replacement for the TX2-433-40-3V  
Direct replacement for the TX2-433-40-5V  
Different frequency replacement for TX3A  
Standard: TX2A-433-64  
The standard frequency is 433.92MHz, for other frequency variants, please contact sales  
department.  
The RX2A receiver is manufactured in several variants:  
Data rate:  
Slower version:  
(suffix -10)  
Faster version:  
(suffix -64)  
7.8kHz baseband B/W,  
50kHz baseband B/W,  
data rate up to 10kb/s  
data rate up to 64kb/s  
Frequency:  
433.92MHz (suffix -433)  
434.42MHz (suffix -434)  
The following variants are standard:  
RX2A-433-10  
RX2A-433-64  
433.92MHz, 10kbps  
433.92MHz, 64kbps  
For other variants please contact Sales department.  
Radiometrix Ltd, TX2A/RX2A Data Sheet  
page 10  
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 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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