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RX2G

型号：

RX2G

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：

10 页

PDF大小：

207 K

下载PDF手册
Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England  
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com  
Issue 3, 13 November 2012  
TX2A/RX2G  
UHF FM Data Transmitter and Receiver Modules  
The TX2A and RX2G data radio modules  
are PLL synthesiser based miniature  
PCB mounting UHF radio transmitter  
and receiver pair which enable the  
simple implementation of a wireless  
data link at up to 64 kbps at distances  
up to 75 metres in-building and 300  
metres open ground.  
Features  
. Designed for compliance with EN 300  
220-3 (radio) and EN 301 489-3 (EMC) standards  
. Data rates up to 128kbps  
Figure 1: RX2G-433-15 & TX2A-433-64  
. Usable range up to 300m  
. Versions available on 433.92MHz, 434.42MHz and 434.525MHz  
. 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 RX2G 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  
. 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 - RX2G  
. Single conversion FM superhet  
. SAW front end filter gives >50dB image rejection  
. Supply: +5V (± 10%) or 5.1 – 16V (regulator version)  
. Current consumption: 10mA (typ.)  
. -102dBm sensitivity @ 1ppm BER, 64kbps version  
. -108dBm sensitivity @ 1ppm BER, 15kbps version  
. RSSI output with 50dB range  
. Extremely low LO leakage, -125dBm typical  
Evaluation platforms: Universal Evaluation Kit, NBEK + SIL carrier  
Radiometrix Ltd, TX2A/RX2G 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 RX2G module is a single conversion FM superhet receiver capable of handling data rates of up to 64kbps.  
RX2G needs a regulated 5V supply and draws 10mA when receiving. The RX2G features a fast power-up time  
for effective duty cycle power saving and a signal strength (RSSI) output with 50dB of range. Full screening and  
a SAW front-end filter give good immunity to interference. The SIL style RX2G 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  
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  
50RF output to the antenna. Internally DC-  
isolated. See antenna section of apps notes for  
details of suitable antennas.  
15.24 mm  
2
3
4
5
6
7
1
5 = Vcc  
6 = 0V  
7 = TXD  
En  
(pin 4)  
Tx enable. <0.15V shuts down module (current  
<1A). >1.7V enables the transmitter.  
Impedance ~1M. Observe slew rate  
requirements (see apps notes).  
7 holes, 0.7 mm dia, pin spacing 2.54 mm  
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 (>100k).  
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/RX2G Data Sheet  
page 2  
RX2G receiver  
Pin description  
RF IN  
(pin 1)  
50 input from the antenna, DC isolated.  
RF GND  
(pin 2)  
RF ground pins, internally connected to  
the module screen and pin 6 (0V). This  
pin should be connected to the RF return  
path (coax braid, main PCB ground plane  
etc.)  
RF GND  
(pin 3)  
Not fitted on non-regulator 5V variant  
Fig 4: physical dimensions & pin outs  
En (Regulator version)(pin 4)  
Rx enable. <0.15V shuts down module (current <1uA). >1.7V enables the receiver. Impedance ~1Mohm.  
Observe slew rate requirements (see apps notes).  
Not fitted on non-regulator 5V variant.  
RSSI  
(pin 5)  
Received signal strength indicator with 60dB range. See page 4 for typical characteristics.  
GND  
(pin 6)  
DC supply ground. Internally connected to pin 2 & 3 and module screen.  
Vcc  
(pin 7)  
5V regulated DC supply. Max ripple content 0.1Vp-p.  
Vcc (for regulator version)  
(pin 7)  
+4.5V to +16.0V DC supply. Max ripple content 0.1Vp-p. Decoupling is not generally required.  
AF out (pin 8)  
Buffered and filtered analogue output from the FM demodulator. Standing DC bias 2V approx. External load  
should be >10k// <100pF.  
RXD  
(pin 9)  
This digital output from the internal data slicer is a squared version of the signal on pin 8 (AF). It may be used  
to drive external decoders. The data is true data, i.e. as fed to the transmitter.  
Radiometrix Ltd, TX2A/RX2G 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  
-20C to +70C  
-40C to +100C  
TX2A, all variants  
Vcc (pin 3)  
Data input (pin 5)  
-0.3V to +16.0V  
+/- 7V  
RF out (pin 2)  
50V DC 10dBm RF  
RX2G all variants  
Vcc (pin 7)  
-0.1V to +5.5V  
RSSI, AF, RXD (pins 5,8,9)  
RF IN (pin 1)  
-0.1V to +3V  
±50V DC, +10dBm RF  
Performance Specifications: TX2A  
(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 50load.  
Radiometrix Ltd, TX2A/RX2G Data Sheet  
page 4  
Performance specifications: RX2G  
(Vcc = 5.0V / temperature = 20 °C unless stated)  
pin  
min.  
typ.  
max.  
units  
notes  
DC supply  
Supply voltage  
Supply voltage (regulator ver.)  
Supply current  
5
5
5
4.5  
4.5  
9
5.0  
5.0  
15  
5.5  
16  
18  
V
V
mA  
1
RF/ IF  
RF sensitivity for 10dB (S+N/N)  
RF sensitivity for 1ppm BER  
RF sensitivity for 1ppm BER  
RSSI range  
IF bandwidth  
Image rejection  
1,2  
1,2  
1,2  
1,2  
-
1
1
1
-
-
-
-
-
-113  
-108  
-102  
50  
180  
54  
-
-
-
-
-
-
-
dBm  
dBm  
dBm  
dB  
kHz  
dB  
15kbps  
64kbps  
50  
100  
-
IF rejection (10.7MHz)  
LO leakage, conducted  
-
dB  
dBm  
-125  
-110  
Baseband  
Baseband bandwidth @ -3dB  
Baseband bandwidth @ -3dB  
AF level  
DC offset on AF out  
Distortion on recovered AF  
Load capacitance, AFout/RXD  
8
8
8
8
8
0
0
200  
1.5  
-
-
-
7.8  
50  
350  
2.5  
5
kHz  
kHz  
mVP-P  
V
%
pF  
15kbps version  
64kbps version  
250  
2
1
2
3
3
3,8  
-
-
100  
DYNAMIC TIMING  
Power up with signal present  
Power up to valid RSSI  
Power up to stable data  
3,5  
3,9  
3,9  
3,9  
3,9  
3,9  
-
-
0.5  
2
10  
2
10  
3
1
10  
ms  
ms  
ms  
ms  
ms  
ms  
3, 15kbps  
3, 15kbps, DS  
3, 64kbps  
3, 64kbps, DS  
3, 128kbps  
Power up to stable data  
Power up to stable data  
-
10  
Signal applied with supply on  
RSSI response time (rise/fall)  
Signal to stable data  
1,5  
1,9  
1,9  
1,9  
1,9  
1,9  
-
-
100  
0.5  
5
0.2  
1.5  
0.75  
-
1
µs  
ms  
ms  
ms  
ms  
ms  
3, 15kbps  
3, 15kbps, DS  
3, 64kbps  
3, 64kbps, DS  
128kbps  
Signal to stable data  
-
0.5  
Signal to stable data  
Time between data transitions  
Time between data transitions  
Mark:space ratio  
9
9
9
ms  
ms  
ms  
ms  
%
4, 15kbps  
4, 15kbps DS  
4, 64kbps  
4, 64kbps DS  
5
0.0667  
0.0667  
0.0156  
0.0156  
20  
1.5  
75  
0.2  
3
50  
80  
Notes:  
1. Current increases at higher RF input levels (>-20dBm and above).  
2. For received signal with ±30kHz 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. squarewave).  
5. Average over 10ms (15kbps version) or 3ms (64kbps version) at maximum data rate  
Radiometrix Ltd, TX2A/RX2G Data Sheet  
page 5  
Power supply requirement  
The standard TX2A module incorporates 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 10F low-  
ESR tantalum or similar capacitor be added between the module supply pin (Vcc) and ground, together with a  
10series 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 1A.  
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.  
The standard RX2G requires a regulated 5V supply with ripple content <100mVpk-pk.  
However, a built-in regulator version is also available. The regulator version can be operated from 5V  
(minimum) up to 16V (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).  
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 (>100k)  
and can usually be ignored when calculating required resistor values.  
Received Signal Strength Indicator (RSSI)  
The RX2G 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 5 of the module has a standing DC bias in the region of 0.5V with no signal, rising to around  
1V at maximum indication. The RSSI output source impedance is high (~100k) 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 5 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 5 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/RX2G 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):  
1100  
1000  
900  
800  
700  
600  
500  
400  
300  
200  
-130  
-120  
-110  
-100  
-90  
-80  
-70  
-60  
-50  
RF input level (dBm)  
Figure 5: 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  
50microstrip 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.  
Radiometrix Ltd, TX2A/RX2G 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.6: Antenna configuration  
Features  
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 & RX2G-433-15-5V)  
**  
200m  
***  
100m  
*
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/RX2G 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.  
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 RX2G receivers are also manufactured in several variants:  
Data rate: Slower version: 7.8kHz baseband B/W, data rate up to 15kb/s  
(suffix -15)  
Faster version: 50kHz baseband B/W, data rate up to 64kb/s  
(suffix -64)  
The following variants are standard:  
RX2G-433-15-5V-DS 433.92MHz, 15kbps, Data Slicer for Non-bit balanced data  
RX2G-433-64-5V-DS 433.92MHz, 64kbps, Data Slicer for Non-bit balanced data  
RX2G-433-15-5V  
RX2G-433-64-5V  
RX2G-433-128-5V  
433.92MHz, 15kbps, Manchester Encoded data packet with preamble  
433.92MHz, 64kbps, Manchester Encoded data packet with preamble  
433.92MHz, 128kps, Manchester Encoded data packet with preamble  
Regulator version:  
RX2G-433-15-DS  
RX2G-433-64-DS  
433.92MHz, 15kb/s  
433.92MHz, 64kb/s  
TX2A/RX2G pair is available on the following frequencies as standard  
Frequency:  
433.92MHz  
434.42MHz  
434.525MHz  
(suffix -433)  
(suffix -434)  
(suffix -434.525)  
For other frequency variants within 433.05-434.79MHz SRD band, please contact sales department  
Evaluation platforms:  
1. Universal Evaluation Kit  
2. NBEK + SIL carrier  
Radiometrix Ltd, TX2A/RX2G Data Sheet  
page 9  
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/  
Information Requests  
Ofcom  
European Communications Office (ECO)  
Peblingehus  
Riverside House  
Nansensgade 19  
2a Southwark Bridge Road  
London SE1 9HA  
Tel: +44 (0)300 123 3333 or 020 7981 3040  
Fax: +44 (0)20 7981 3333  
information.requests@ofcom.org.uk  
DK 1366 Copenhagen  
Tel. +45 33896300  
Fax +45 33896330  
ero@ero.dk  
www.ero.dk  
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