EW
N
Issue B, 17 March 2005
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
NTX2/NRX2
UHF Narrow Band FM TX & RX
The NTX2 transmitter and NRX2
receiver offer a low power, reliable
data link in a Radiometrix SIL
standard pin out and foot print. This
makes the NTX2/NRX2 pair ideally
suited to those low power applications
where
existing
single
frequency
wideband
UHF
modules
have
insufficient range.
Figure 1: NRX2-434.650-10
NTX2-434.650-10
Features
•
•
•
•
•
•
•
Conforms to ETSI EN 300 220-3 (radio) and EN 301 489-3 (EMC)
Standard frequencies: 434.075MHz, 434.650MHz and 458.700MHz
Custom frequencies available in 433MHz (EU) and 458MHz (UK) band
Data rates up to 10kbps
Usable range over 500m
25kHz Channel spacing
Longer range compared to Wide Band FM modules
Available for licence-exempt operation in the 433MHz (EU) and 458MHz (UK) bands, the NTX2 &
NRX2 modules combine effective screening with internal filtering to minimise spurious radiation and
susceptibility thereby ensuring EMC compliance. They can be used in existing low data rate (<10kbps)
applications where the operating range of the system using TX2 transmitter and RX2 receiver need to
be extended. They are particularly suitable for point-to-point and point-to-multipoint wireless links
where longer ranges are required at low data rates. Applications include sensor nodes, EPOS and
inventory tracking, remote industrial process monitoring, telemetry, telecommand and telecontrol.
Because of their small size and low power consumption, both modules are ideal for use in battery-
powered portable applications such as handheld terminals.
Transmitter – NTX2
•
•
•
•
3 stage crystal controlled VCXO
Supply 2.9V - 15V @ 18mA (internal 2.8V voltage regulator)
Data bit rate: 10kbps max.
Transmit power: +10dBm (10mW)
Receiver – NRX2
•
•
•
•
•
•
•
•
•
•
Double conversion FM superhet
SAW band pass filter, image rejection: 50dB
Intermediate Frequencies (IF): 21.4MHz, 455kHz
Supply range: 2.9V - 15V @ 14mA (internal 2.8V voltage regulator)
Data bit rate: 10kbps max.
Receiver sensitivity: -118dBm (for 12dB SINAD)
Receiver sensitivity: -112dBm (for 1ppm BER)
Local Oscillator (LO) re-radiation: <-60dBm
Adjacent Channel: -70dBm
Blocking: -84dB
NTX2/NRX2 data sheet
Page 1
Radiometrix Ltd.,
Functional description
The NTX2 transmitter consists of a Frequency Modulated (FM) Voltage Controlled Crystal Oscillator
(VCXO) feeding a frequency multiplier with two stage amplifier and RF filter. Operation can be
controlled by the EN (Enable) line, the transmitter achieving full RF output typically within 5ms of this
line being pulled high. The RF output is filtered to ensure compliance with the appropriate radio
regulations and fed to the 50Ω antenna pin.
The NRX2 module is a double conversion NBFM superhet receiver capable of handling data rates of up
to 10kbps. It will operate from a supply of 2.9V to 15V and draws 14mA when receiving. A signal
strength (RSSI) output with greater than 60dB of range is provided. The SIL style NRX2 measures 47 x
17 x 8 mm excluding the pins.
NTX2 Transmitter
Figure 2: NTX2 block diagram
43mm
32mm
8mm
15mm
NTX2
15.24mm (0.6")
1
2
3
4
5
6
7
23.5mm
7 holes of 0.7mm dia.
pin spacing 2.54mm (0.1")
1 = RF gnd
2 = RF out
3 = RF gnd
4 = En
5 = Vcc
6 = 0V
7 = TXD
Figure 3: NTX2 pin-out and dimension
User interface
NTX2 pin
1, 3
2
4
5
6
7
Notes:
1.
2.
3.
EN pin should not be left floating
Pinout footprint is as TX1H.
Compatible with RX2M, RLC2 and NRX2
Name
RF gnd
RF out
EN
Vcc
0V
TXD
Function
RF ground is 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.
50Ω RF output to the antenna
Pull high to enable Transmitter (3V CMOS logic)
2.9 – 15V DC power supply
Ground
DC coupled input for 3V CMOS logic. R
in
= 100kΩ
Radiometrix Ltd.,
NTX2/NRX2 data sheet
Page 2
NRX2 receiver
Figure 4: NRX2 block diagram
47mm
8mm
17mm
NRX2
Radiometrix
30.48mm (1.2")
1
2
3
4
5
6
7
7 holes of 0.7mm dia pin spacing 2.54mm (0.1")
1 = RF in
2 = RF gnd
3 = RSSI
4 = 0V
5 = Vcc
6 = AF
7 = RXD
Figure 5: NRX2 pin-out and dimension
User interface – NRX2
NRX2 pin
1
2
3
4
5
6
7
Name
RF in
RF gnd
RSSI
0V
Vcc
AF
RXD
Function
50Ω RF input from the antenna
RF Ground is internally connected to the module screen and pin
4 (0V). These pins should be directly connected to the RF return
path - e.g. coax braid, main PCB ground plane etc.
Received Signal Strength Indicator with >60dB range.
DC level between 0.5V and 2V
Ground
2.9 – 15V DC power supply
500mV
pk-pk
audio. DC coupled, approx 0.8V bias
Received Data output from the internal data slicer. The data is
squared version of the Audio signal on pin 6 and is true data, i.e.
as fed to the transmitter. Output is "open-collector" format with
internal 10kΩpull-up to Vcc (pin 5). Suitable for bi-phase codes
Notes:
1.
Pinout is as our wideband RX2A receiver
Radiometrix Ltd.,
NTX2/NRX2 data sheet
Page 3
Absolute maximum ratings
Exceeding the values given below may cause permanent damage to the module.
Operating temperature
Storage temperature
NTX2
Vcc, TXD (pins 5,7)
En (pin 4)
RF out (pin 2)
NRX2
Vcc, RXD (pins 7,9)
En, RSSI, AF (pins 4,5,8)
RF in (pin 1)
-10°C to +60°C
-30°C to +70°C
-0.3V to +16.0V
-0.3V to +Vcc V
±50V
@ <10MHz, +20dBm @ >10MHz
-0.3V to +16.0V
-0.3V to +Vcc V
±50V
@ <10MHz, +13dBm @ >10MHz
Performance specifications: NTX2 transmitter
(Vcc = 3V / temperature = 20
°
C unless stated)
General
DC supply
Supply voltage
TX Supply current
Antenna pin impedance
RF
RF centre frequency
NTX2-434.650-10
NTX2-434.075-10
NTX2-458.700-10
Channel spacing
Number of channels
RF power output
Spurious emissions
Adjacent channel TX power
Frequency accuracy
FM deviation (peak)
Baseband
Modulation type
Modulation bandwidth @ -3dB
TXD input level (logic low)
TXD input level (logic high)
Distortion
Dynamic timing
TX Enable to full RF
pin
5
5
2
min.
2.9
-
-
434.650
434.075
458.700
25
1
10
-
-37
-
±3.0
FSK
-
0
3.0
TBA
-
typ.
3.0
18
50
max.
15
-
-
-
units
V
mA
Ω
MHz
1
notes
2
2
-
-
9
-
-
-
±2.5
-
0
-
-
-
-
11
-40
-
±2.5
±3.5
-
5
-
-
kHz
dBm
dBm
dBm
kHz
kHz
2
3
4
F3D
kHz
V
V
%
ms
5
5
6
7
7
-
5
Notes:
1.
2.
3.
4.
5.
6.
Available in 25kHz channel steps on other custom frequencies in 433MHz/458MHz band
Measured into 50Ω resistive load.
Total over full supply and temperature range.
With 0V – 3.0V modulation input.
To achieve specified FM deviation.
For 1V
pk-pk
signal biased at 1.4V
Radiometrix Ltd.,
NTX2/NRX2 data sheet
Page 4
Performance specifications: NRX2 receiver
(Vcc = 3V / temperature = 20
°
C unless stated)
pin
DC supply
Supply voltage
Supply current
RF/IF
RF centre frequency
NRX2-434.650-10
NRX2-434.075-10
NRX2-458.700-10
RF sensitivity @ 12dB SINAD
RF sensitivity @ 1ppm BER
RSSI threshold
RSSI range
IF bandwidth
Blocking
Image rejection
Adjacent channel rejection
Spurious response rejection
LO re-radiation
Baseband
Baseband bandwidth @ -3dB
AF level
DC offset on AF out
Distortion on recovered AF
Dynamic timing
Power up with signal present
Power up to valid RSSI
Power up to valid AF
Power up to stable data
Signal applied with supply on
Signal to valid RSSI
Signal to valid AF
Signal to stable data
Time between data transitions
7
7
1,6
434.650
434.075
458.700
-118
-112
-125
55
TBA
84
55
70
55
-
-
500
0.8
TBA
min.
2.9
-
typ.
3.0
14
max.
15
-
units
V
mA
MHz
notes
1, 6
1, 7
1, 3
1, 4
1
1
1
1
1
6
6
6
6
-
-
-
-
-
-
-
-
-
-
0
-
-
-
-
-
-
-
-
-
-
-
-
-60
5
-
-
-
dBm
dBm
dBm
dB
kHz
dB
dB
dB
dB
dBm
kHz
mV
P-P
V
%
1
1
2
1
3
5, 3
5,6
5, 7
1, 3
1,6
1, 7
7
-
-
-
-
0.1
3
2
TBA
2
1
TBA
-
-
10
-
5
TBA
ms
ms
ms
ms
ms
ms
ms
4
Notes:
1.
2.
3.
4.
See applications information for further details.
Exceeds EN/EMC requirements at all frequencies.
For received signal with
±3kHz
FM deviation. AF output is inverted with respect to TXD input.
For 50:50 mark to space ratio (i.e. squarewave).
Radiometrix Ltd.,
NTX2/NRX2 data sheet
Page 5
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