FM T
RANSMITTER
& R
ECEIVER
M
ODULES
. (2
ND
G
ENERATION
)
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FEATURES
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
FM-TX2-XXX
FM-RX2-XXX
Transmitter - TX2
Receiver - RX2
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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 T
RANSMITTER
& R
ECEIVER
M
ODULES
. (2
ND
G
ENERATION
)
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)
50
Ω
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 0.1V
P-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 100k
Ω
.
DS000022
Rev D
July ‘99
©1999
REG No 277 4001, ENGLAND.
Page 2
FM T
RANSMITTER
& R
ECEIVER
M
ODULES
. (2
ND
G
ENERATION
)
RX2 receiver:
FM-TX2-XXX
FM-RX2-XXX
fig. 3: RX2 block diagram
Pin description
RF in
(
pin 1)
50
Ω
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 < 2mV
P-P
ripple. A
10
µ
F de-coupling capacitor and 10
Ω
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 > 2k
Ω
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 > 1k
Ω
and < 1nF
DS000022
Rev D
July ‘99
©1999
REG No 277 4001, ENGLAND.
Page 3
FM T
RANSMITTER
& R
ECEIVER
M
ODULES
. (2
ND
G
ENERATION
)
Absolute Maximums:
Operating temperature:
-10°C to +55°C
Storage temperature
:
-40°C to +100°C
FM-TX2-XXX
FM-RX2-XXX
TX2, all variants
Vcc (pin 3)
Data input (pin 5)
RF out (pin 2)
RX2, all variants
Vcc (pin 5)
Data , CD & AF (pin 7,3,6)
RF input (pin 1)
note:
-0.1V to +10.0V
-0.1V to +10.0V
±50V
@ < 10MHz , +20dBm @ > 10MHz
-0.1V to +10.0V
-0.1V to + Vcc V
±50V
@ < 10MHz , +13dBm @ > 10MHz
Operation of the TX2 above 6V may cause the module to exceed the licensed
power level.
Electrical Performance: TX2 transmitter
pin
DC LEVELS
supply voltage
supply voltage
CURRENT & RF POWER
TX2-418-3V
supply current @ Vcc = 3V
RF power
@ Vcc = 3V
TX2-418-5V
supply current @ Vcc = 5V
RF power
@ Vcc = 5V
TX2-433-3V
supply current @ Vcc = 3V
RF power
@ Vcc = 3V
TX2-433-5V
supply current @ Vcc = 5V
RF power
@ Vcc = 5V
RF
2
nd
harmonic
Harmonics @ > 1GHz
initial frequency accuracy
overall frequency accuracy
FM deviation (+/-)
Modulation bandwidth @ -3dB
Modulation distortion (THD)
power up time to full RF
3
3
min.
2.2
4.0
typ.
3.0
5.0
max.
4.0
6.0
units
V
V
notes
-3V version
-5V version
3
2
4
-7
6
-3
10
+3
mA
dBm
1
3
2
4
-7
6
-3
10
+3
mA
dBm
1
3
2
4
0
6
+4
10
+6
mA
dBm
1
3
2
7
+6
10
+9
14
+12
mA
dBm
1
2
2
-
-
-
-
-
-
-
-
-30
-70
20
DC
-
-
-65
-50
0
-
25
-
5
-
-54
-40
+30
+70
30
20
10
100
dBc
dBc
kHz
kHz
kHz
kHz
%
µs
1
1
note:
1. Measured into a 50Ω load.
DS000022
Rev D
July ‘99
©1999
REG No 277 4001, ENGLAND.
Page 4
FM T
RANSMITTER
& R
ECEIVER
M
ODULES
. (2
ND
G
ENERATION
)
Electrical Performance: RX2 Receiver
FM-TX2-XXX
FM-RX2-XXX
Figures apply to 5V versions unless noted otherwise Vcc = 5.0V, temperature 20°C unless noted otherwise
pin
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
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
E.M.C.
image rejection (2*F
IF
)
spurious responses upto 1GHz
LO leakage, conducted
LO leakage, radiated
AF BASE BAND
baseband bandwidth @ -3dB
baseband bandwidth @ -3dB
AF level
DC offset on AF
distortion on recovered AF
ultimate (S+N)/N
DYNAMIC TIMING
Power up with signal present
power up to valid CD, T
PU-CD
power up to stable data, T
PU-DAT
power up to stable data, T
PU-DAT
Signal applied with supply on
signal to valid CD, T
SIG-CD
signal to stable data, T
SIG-DAT
signal to stable data, T
SIG-DAT
5
5
5
5
7
7
6,7
min.
4.0
3.0
11
-
-
-
-
typ.
5.0
3.5
13
-
Vcc-0.6
0.4
-
Max.
6.0
4.0
17
2
-
-
100
units
V
V
mA
mV
P-P
V
V
pF
notes
1
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
1
1
1
-
-
-
-
-
-50
-70
-65
-70
-
-
-
-
dB
dB
dBm
dBm
2
2
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
mV
P-P
V
%
dB
-A version
-F version
-
-
-
-
-
-
1
20
5
-
-
-
ms
ms
ms
-A version
-F version
-
-
-
-
-
-
0.5
15
3
-
-
-
ms
ms
ms
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 F
RF
±
(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
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