RFSOLUTIONS FM-RX2-XXX Fm transmitter & receiver modules. (2nd generation) Datasheet

FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
FEATURES
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MINIATURE PACKAGE
PLUG IN COMPATIBLE WITH FM-TX1 / RX1
EMC CONFORMANT TO ETS 300-683
TYPE APPROVED TO ETS 300-220
DATA RATES TO 40KBIT/S
USABLE RANGE TO 300 METRES
418 & 433.92MHZ VERSIONS.
SINGLE SUPPLY VOLTAGE 5V OR 3V
FULLY SCREENED
Receiver - RX2
Transmitter - TX2
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2 STAGE SAW CONTROLLED, FM
MODULATED AT UPTO 40KBIT/S
OPERATION FROM 2.2 TO 6 VOLTS
10mW ON 433.92MHZ (EUROPE) , 1mW ON
418MHZ (UK)
HIGH EFFICIENCY, >15% , DC --> RF
IMPROVED FREQUENCY AND DEVIATION
ACCURACY
2ND HARMONIC, < -60DBC
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DOUBLE CONVERSION FM SUPERHET
SAW FRONT END FILTER, IMAGE
REJECTION 50DB
SUPPLY 3.0 TO 6.0 VOLTS @ 13MA
40KBIT/S, -F VERSION , -100 DBM
SENSITIVITY @ 1PPM BER
14KBIT/S. -A VERSION , -107 DBm
SENSITIVITY @ 1PPM BER
LO LEAKAGE, < -60 DBM
Description
The TX2 and RX2 data link modules are a miniature PCB mounting UHF radio transmitter and receiver pair
which enable the simple implementation of a data link at upto 40 Kbit/s at distances upto 75 metres in-building
and 300 metres open ground.
Available for operation at 433.92 MHz in Europe and 418.00 MHz in the U.K., both modules combine full
screening with extensive internal filtering to ensure EMC compliance by minimising spurious radiations and
susceptibilities. The TX2 and RX2 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.
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 1
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Functional description:
The TX2 transmitter module is a two stage, SAW controlled FM transmitter operating between
2V and 6V and is available in 433.92MHz and 418.00 MHz versions. The 433.92 MHz unit is
type-approved to ETS 300-220 for European use and delivers nominally +9dBm from a 5V
supply at 12mA, while the 418.00 MHz unit has MPT 1340 type-approval for U.K. use and
delivers -3dBm from a 5V supply at 5mA. Both modules measure 12 x 32 x 3.8 mm.
The RX2 module is a double conversion FM superhet receiver capable of handling date rates of
upto 40kbit/s. The SIL style RX2 receiver measures 17.5 x 48 x 4.5 mm. It will operate from a
supply of 3-6V and draws 14mA when receiving. A fast-acting carrier detect and a power-up
enable time of less than 1ms This allows effective duty cycle power saving and a -107 dBm
sensitivity. This, combined with a SAW front-end filter results in an excellent RF performance
and EMC conformance.
TX2 transmitter:
fig. 1: TX2 block diagram
Pin description:
RF GND
(pin 1)
RF ground pin, internally connected to
the module screen and pin 4 (0V). This
pin should be connected to the RF
return path (e.g. coax braid, main PCB
ground plane etc.)
RF out
(pin 2)
50Ω RF output to the antenna, it is DC
isolated internally. (see antenna section
of TX2 applications note for suggested
antenna/feeds).
Vcc
(pin 3)
+ve supply pin. The module will generate RF when the Vcc supply is present. Max ripple
content 0.1VP-P. A 100nF de-coupling ceramic capacitor is suggested.
0V
(pin 4)
Supply ground connection, connected to pin 1 and screen.
TXD
(pin 5)
This DC coupled modulation input will accept either serial digital data ( 0V to Vcc levels) or
high level linear signals. see TX2 applications note for suggested drive methods. Input
impedance is 100kΩ.
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 2
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
RX2 receiver:
fig. 3: RX2 block diagram
Pin description
RF in
(pin 1)
50Ω RF input from the antenna,
it is DC isolate internally. (see
antenna section of RX2
applications note for suggested
antenna/feeds).
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 (e.g. coax braid, main PCB
ground plane etc.)
fig. 4: physical dimensions
CD
(pin 3)
The Carrier Detect may be used to drive an external PNP transistor to obtain a logic
level carrier detect signal, see test circuit / applications note. If not required it should
be connected to pin 5 (Vcc).
0volt
(pin 4)
Supply ground connection, connected to pin 1 and screen.
Vcc
(pin 5)
+ve supply pin. +3.0V to +6.0V @ <17mA . The supply must be clean < 2mVP-P ripple. A
10µF de-coupling capacitor and 10Ω series resistor is recommended if a clean supply is
not available.
AF
(pin 6)
This is a buffered and filtered analogue output from the FM demodulator. It has a
standing DC bias of 1.2V and 400mV P-P base band signal. It is useful as a test point or
to drive linear decoders. Load impedance should be > 2kΩ and < 100pF.
RXD
(pin 7)
This digital output from the internal data slicer is a squared version of the signal on
pin 6 (AF). It may be used to drive external decoders. The data is true data, i.e. as fed
to the transmitter. Load impedance should be > 1kΩ and < 1nF
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 3
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Absolute Maximums:
Operating temperature:
-10°C to +55°C
Storage temperature
:
-40°C to +100°C
TX2, all variants
Vcc (pin 3)
Data input (pin 5)
RF out (pin 2)
-0.1V to +10.0V
-0.1V to +10.0V
±50V @ < 10MHz , +20dBm @ > 10MHz
RX2, all variants
Vcc (pin 5)
Data , CD & AF (pin 7,3,6)
RF input (pin 1)
-0.1V to +10.0V
-0.1V to + Vcc V
±50V @ < 10MHz , +13dBm @ > 10MHz
note:
Operation of the TX2 above 6V may cause the module to exceed the licensed
power level.
Electrical Performance: TX2 transmitter
pin
min.
typ.
max.
units
notes
3
3
2.2
4.0
3.0
5.0
4.0
6.0
V
V
-3V version
-5V version
TX2-418-3V
supply current @ Vcc = 3V
RF power
@ Vcc = 3V
3
2
4
-7
6
-3
10
+3
mA
dBm
1
TX2-418-5V
supply current @ Vcc = 5V
RF power
@ Vcc = 5V
3
2
4
-7
6
-3
10
+3
mA
dBm
1
TX2-433-3V
supply current @ Vcc = 3V
RF power
@ Vcc = 3V
3
2
4
0
6
+4
10
+6
mA
dBm
1
TX2-433-5V
supply current @ Vcc = 5V
RF power
@ Vcc = 5V
3
2
7
+6
10
+9
14
+12
mA
dBm
1
RF
2nd harmonic
Harmonics @ > 1GHz
initial frequency accuracy
overall frequency accuracy
2
2
-
-30
-70
-65
-50
0
-
-54
-40
+30
+70
dBc
dBc
kHz
kHz
FM deviation (+/-)
Modulation bandwidth @ -3dB
Modulation distortion (THD)
power up time to full RF
-
20
DC
-
25
5
-
30
20
10
100
kHz
kHz
%
µs
DC LEVELS
supply voltage
supply voltage
CURRENT & RF POWER
note:
DS000022
Rev D
1
1
1. Measured into a 50Ω load.
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 4
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Electrical Performance: RX2 Receiver
Figures apply to 5V versions unless noted otherwise Vcc = 5.0V, temperature 20°C unless noted otherwise
pin
min.
typ.
Max.
units
notes
DC LEVELS
supply voltage, Vcc standard
supply voltage, Vcc, 3V version
supply current
supply ripple
data output high, 100µA source
data output low, 100µA sink
load capacitance on AF / Data
5
5
5
5
7
7
6,7
4.0
3.0
11
-
5.0
3.5
13
Vcc-0.6
0.4
-
6.0
4.0
17
2
100
V
V
mA
mVP-P
V
V
pF
1
RF
RF sensitivity for 10dB (S+N)/N
RF sensitivity for 10dB (S+N)/N
RF sensitivity for 1ppm BER
RF sensitivity for 1ppm BER
CD threshold
CD threshold
IF band width
initial frequency accuracy
1,6
1,6
1,6
1,6
1,3
1,3
1
-30
-113
-107
-107
-100
-107
100
250
0
-107
-100
-100
-93
-97
-90
+30
dBm
dBm
dBm
dBm
dBm
dBm
kHz
kHz
-A version
-F version
-A version
-F version
-A version
-F version
E.M.C.
image rejection (2*FIF)
spurious responses upto 1GHz
LO leakage, conducted
LO leakage, radiated
1
1
1
-
-
-50
-70
-65
-70
-
dB
dB
dBm
dBm
2
2
AF BASE BAND
baseband bandwidth @ -3dB
baseband bandwidth @ -3dB
AF level
DC offset on AF
distortion on recovered AF
ultimate (S+N)/N
6
6
6
6
6
6
0.006
0.060
0.8
35
450
1.2
0.5
45
7
20
1.6
1
-
kHz
kHz
mVP-P
V
%
dB
-A version
-F version
DYNAMIC TIMING
Power up with signal present
power up to valid CD, TPU-CD
power up to stable data, TPU-DAT
power up to stable data, TPU-DAT
-
-
1
20
5
-
ms
ms
ms
Signal applied with supply on
signal to valid CD, TSIG-CD
signal to stable data, TSIG-DAT
signal to stable data, TSIG-DAT
-
-
0.5
15
3
-
ms
ms
ms
-A version
-F version
time between data transitions
7
15
0.07
ms
4,-A version
time between data transitions
7
1.5
0.025
ms
4,-F version
mark:space ratio
20
50
80
%
3
notes:
1. For 6dB (S+N)/N degradation on wanted -100dBm signal
2. Receiver spurious responses are at FRF ± (n×15.92MHz), n=1,2,3 etc.
3. Average over 30ms (-A), 3ms (-F) at maximum bit rate.
4. Values for 50:50 mark to space (i.e. square wave)
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 5
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Module test circuits
fig.5: TX2 test circuit
fig.6: RX2 test circuit
∗
The PNP transistor enables a CMOS compatible Carrier Detect signal to be derived from pin 3. If no CD signal required
pin 3 should be connected directly to pin 5 (Vcc)
Module mounting considerations
The modules may be mounted horizontally or vertically on an area of ground plane preferably
close to the antenna to minimise feed length. The receiver and it’s antenna should be kept away
from sources of interference (micro’s, SMPS etc.). The modules may be potted if required in a
viscous compound which can not enter the screen can..
Warning: Do NOT wash the modules. They are not hermetically sealed.
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 6
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Antenna requirements
Three types of integral antenna are recommended and approved for use with the module:
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.
Loop
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.
Whip
This is a wire, rod, PCB track or combination connected directly to pin 2
of the module. Optimum total length is 17cm (1/4 wave @ 418MHz) 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
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
Range open ground to similar antenna
helical
**
**
***
**
200m
loop
*
*
**
***
100m
whip
***
***
*
*
300m
(for TX2-433-A & RX2-433-A)
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.
Antenna selection chart
Fig.8: antenna configurations
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 7
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Type Approval in UK
The TX2-418 is type approved in the UK to MPT1340 for use in Telemetry, Telecommand and InBuilding alarm applications.
CONFORMANCE to MPT1340 REQUIRES THAT:
1. The transmitting antenna must be one of the 3 variants given in the data sheet. Antenna
structures which yield ERP gain are not permitted.
2. The module must be directly and permanently connected to the transmitting antenna without
the use of an external feeder. Increasing the RF power level by any means is not permitted.
3. The module must not be modified nor used outside it's specification limits.
4. The module may only be used to send digital or digitised data. Speech and/or music are not
permitted.
5. The equipment in which the module is used must carry an inspection mark located on the
outside of the equipment and be clearly visible. The minimum dimensions of the inspection
mark shall be 10 x 15 mm and the letter and figure height must be no less than 2mm. The
wording shall read:
RTD: xxxxxx
SRD-MPT1340-GB
6. Products intended for UK commercial application must be notified to the
Radiocommunications Agency (RA) on form RA 249 ( Cat I), obtainable from the RA's library
service, Tel 0171 211 0502 / 0505
OEM Manufacturers incorporating the TX2 as a component part of their product are authorised
by Radiometrix Ltd to quote their type-approval provided all the above conditions are complied
with.
European type approval
The TX2-433 & RX2-433 are type approved to ETS 300-220 for European use.
CONFORMANCE to ETS 300-220 REQUIRES THAT:
1. The transmitting antenna must be one of the 3 variants given in the data sheet. Antenna
structures which yield ERP gain are not permitted.
2. The module must be directly and permanently connected to the transmitting antenna without
the use of an external feeder. Increasing the RF power level by any means is not permitted.
3. The module must not be modified nor used outside it's specification limits.
4. The equipment in which the module is used must carry an inspection mark located on the
outside of the equipment and be clearly visible. The minimum dimensions of the inspection
mark shall be 10 x 15 mm and the letter and figure height must be no less than 2mm. The
wording shall read:
Radiometrix
TX2-433
CEPT-LPD-xx
respectiv ely,
Radiometrix
RX2-433
CEPT-LPD-xx
OEM Manufacturers incorporating the TX2 & RX2 as a component part of their product are
authorised by Radiometrix Ltd to quote our type-approval provided all the above conditions are
complied with.
Most EEC member countries require notification before your product may be sold. We advise
you to contact the relevant country.
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 8
FM TRANSMITTER & RECEIVER
MODULES. (2ND GENERATION)
FM-TX2-XXX
FM-RX2-XXX
Variants and Ordering information
The TX2 transmitter and RX2 receiver are manufactured in several variants
Frequencies
418.00 MHz for UK use
433.92 MHz for European use
Supply voltage 5V
3V
RX data rate:
( 4V to 6V TX2 & RX2)
( 3V to 4V for RX2, 2.2V to 4V for TX2)
-A, 7kHz baseband BW, slow data upto 14kbps
-F, 20kHz baseband BW, fast data upto 40kbps
RX data rate applies to receivers only, the TX2 will handle fast or slow data.
PART No
FM-TX2-418-5V
FM-TX2-418-3V
FM-TX2-433-5V
FM-TX2-433-3V
FM-RX2-418A-5V
FM-RX2-418F-5V
FM-RX2-433A-5V
FM-RX2-433F-5V
FM-RX2-418A-3V
FM-RX2-418F-3V
FM-RX2-433A-3V
FM-RX2-433F-3V
DESCRIPTION
Transmitter 418MHz 5 Volt Operation -6dBm
Transmitter 418MHz 3 Volt Operation -6dBm
Transmitter 433MHz 5 Volt Operation +9dBm
Transmitter 433MHz 3 Volt Operation +9dBm
Receiver, 418MHz 5 Volt Operation 14kbps
Receiver, 418MHz 5 Volt Operation. Fast Version 40kbps
Receiver, 433MHz 5 Volt Operation 14kbps
Receiver, 433MHz 5 Volt Operation. Fast Version 40kbps
Receiver, 418MHz 3 Volt Operation 14kbps
Receiver, 418MHz 3 Volt Operation. Fast Version 40kbps
Receiver, 433MHz 3 Volt Operation 14kbps
Receiver, 433MHz 3 Volt Operation. Fast Version 40kbps
Should you require further assistance, please call;
R. F. Solutions Ltd.,
Unit 21, Cliffe Industrial Estate,
South Street,
Lewes,
E Sussex, BN8 6JL. England.
Tel +44 (0)1273 898 000. Fax +44 (0)1273 480 661.
Email [email protected]
http://www.rfsolutions.co.uk
RF Solutions is a member of the Low Power Radio Association.
RF module data appears courtesy of Radiometrix Ltd, Middlesex, England.
Limitation of Liability
The information furnished by RF Solutions Ltd. is believed to be accurate and reliable. RF Solutions Ltd reserves the right to make changes or improvements in the design,
specification or manufacture of its sub-assembly products without notice. RF Solutions 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.
Radio and EMC Regulations
The Intrastat commodity code for all our modules is : 8542 4090. The purchaser of RF Solutions Ltd sub-assemblies must satisfy all relevant EMC and Radio regulations
which applies to the finished products in the country of use.
Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. with respect to the accuracy of
such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
DS000022
Rev D
July ‘99
1999 REG No 277 4001, ENGLAND.
Page 9
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