EW
N
Issue 1, 10 May 2006
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
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.
Features
!
!
!
!
!
Figure 1: TX2A-433-64 & RX2A-433-64
!
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
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
!
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
!
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
regulator
5
2.2 -- 16V
2
RF out
433.92 MHz
band pass
filter
buffer
VCO
÷
32
Loop
Filter
φ
4
En
ref
osc
35kHz
LPF
7
TXD
3
RF gnd
1
6
0V
Fig. 2: TX2A block diagram
Pin description:
RF GND
(pins 1&3)
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.
RF OUT
(pin 2)
50Ω RF output to the antenna. Internally DC-
isolated. See antenna section of apps notes for
details of suitable antennas.
En
(pin 4)
Tx enable. <0.15V shuts down module (current
<1µA). >1.7V enables the transmitter.
Impedance ~1MΩ. Observe slew rate
requirements (see apps notes).
12.0
mm
32 mm
3.8 mm
12.5
mm
TX2A
Radiometrix
PCB level
15.24 mm
1
2
3
4
5
6
7
1 = RF GND
2 = RF OUT
3 = RF GND
4 = En
5 = Vcc
6 = 0V
7 = TXD
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 0.1V
P-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
433MHz
SAW BPF
LNA 1
1
RF in
LNA 2
MIXER
IF1
10.7MHz
10.7MHz IF filter
IF2/Lim
10.7MHz
3
RSSI
10.7MHz
ceramic
discriminator
(f
RF
- 10.7MHz)
Audio LPF
AF
buffer
6
AF out
16
XTAL OSC.
VCO
C
L
R
T
+2.8V
regulated
to circuit
C
T
data
slicer
10kΩ
5
V
cc
7
RXD
Loop filter
Crystal
Phase
26/28MHz detector
(Fixed frequency PLL Osc.)
Low
dropout
regulator
2
RF gnd
4
0V
Figure 4: RX2A Block diagram
Pin description:
RF IN
(pin 1)
50Ω input from the antenna, DC isolated
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.)
17.5 mm
48 mm
4.5 mm
18.0 mm
RX2A
30.48 mm
Radiometrix
PCB level
1
2
3
4
5
6
7
1 = RF IN
2 = RF GND
3 = RSSI
4 = 0V
5 = Vcc
6 = AF out
7 = RXD
7 holes of 0.7 mm dia. pin spacing 2.54mm
Figure 5: Physical dimensions
RSSI
(pin 3)
Received signal strength indicator with 60dB range. See page 4 for typical characteristics.
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 0.1V
p-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:
Operating temperature-
Storage temperature
TX2A, all variants
Vcc (pin 3)
Data input (pin 5)
RF out (pin 2)
RX2A all variants
Vcc (pin 5)
RSSI, AF, RXD (pins 3,6,7)
RF IN (pin 1)
Exceeding the values given below may cause permanent damage to the module.
-20°C to +70°C
-40°C to +100°C
-0.3V to +16.0V
+/- 7V
±50V
DC 10dBm RF
-0.V to +16V
-0.1V to + 3V
±8V
DC, +10dBm RF
Performance Specifications: TX2A transmitter.
(Temperature = 20C unless stated)
pin
DC LEVELS
supply voltage
supply voltage
supply voltage
CURRENT & RF POWER
TX2A-433-64-3V
supply current @ Vcc = 3V
RF power
@ Vcc = 3V
TX2A-433-64-5V
supply current @ Vcc = 5V
RF power
@ Vcc = 5V
TX2A-433-64-STD
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
Note:
3
3
3
min.
2.2
4.0
3
typ.
3.0
5.0
-
max.
4.0
6.0
16
units
V
V
V
notes
-3V version
-5V version
STD
3
2
3
2
3
2
2
2
-
-
-
-
-
-
9
+8
9
+8
9
+8
-
-
-20
-25
20
DC
-
-
11
+10
11
+10
11
+10
-70
-60
+/-10
+/-10
27
-
5
1
13
+12
13
+12
13
+12
-54
-40
+20
+25
35
35
10
1.5
mA
dBm
mA
dBm
mA
dBm
dBc
dBc
kHz
kHz
kHz
kHz
%
ms
1
1
1
1
1
1. Measured into a 50Ω load.
Radiometrix Ltd, TX2A/RX2A Data Sheet
page 4
Performance specifications: RX2A
(Vcc = 5.0V / temperature = 20
o
C unless stated)
pin
DC supply
Supply voltage
Supply current
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
LO leakage, conducted
Baseband
Baseband bandwidth @ -3dB
Baseband bandwidth @ -3dB
AF level
DC offset on AF out
Distortion on recovered AF
Ultimate (S+N)/N
Load capacitance, AFout/RXD
DYNAMIC TIMING
5
5
1,6
1,6
1,7
1,7
1,3
-
1
1
1
6
6
6
6
6
6
6,7
min.
2.7
11
-
-
-
-
-
-
50
-
-
0
0
-
0.45
-
-
-
typ.
5.0
11.6
-115
-108
-108
-101
60
180
53
94
-120
-
-
500
1.1
1
40
-
max
16.0
13
-
-
-
-
-
-
-
-
-100
7.8
50
-
1.75
5
-
100
units
V
mA
dBm
dBm
dBm
dBm
dB
kHz
dB
dB
dBm
kHz
kHz
mV
P-P
V
%
dB
pF
notes
1
10kb/s version
64kb/s version
10kb/s version
64kb/s version
10kb/s version
64kb/s version
2
3
3
Power up with signal present
Power up to valid RSSI
Power up to stable data
Power up to stable data
Signal applied with supply on
RSSI response time (rise/fall)
Signal to stable data
Signal to stable data
Time between data transitions
Time between data transitions
Mark:space ratio
Notes:
1.
2.
3.
4.
5.
3,5
5,7
5,7
1,3
1,7
1,7
7
7
7
-
-
-
-
-
-
0.1
15.6
20
1
10
5
100
5
5
-
-
50
-
30
10
-
30
10
15
1500
80
ms
ms
ms
3, 10kb/s version
3, 64kb/s version
µs
ms
ms
ms
µs
%
3, 10kb/s version
3, 64kb/s version
4, 10kb/s version
4, 64kb/s version
5
Current increases at higher RF input levels (>-20dBm and above)
For received signal with
±40kHz
FM deviation.
Typical figures are for signal at centre frequency, max. figures are for
±50kHz
offset.
For 50:50 mark to space ratio (i.e. square wave).
Average over 30ms (10kb/s version) or 3ms (64kb/s version) at maximum data rate.
Radiometrix Ltd, TX2A/RX2A Data Sheet
page 5
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