NTR2 RADIOMETRIX [Radiometrix Ltd], NTR2 Datasheet - Page 2

• Manufacturer Part Number: NTR2
• Description: UHF Narrow Band FM Transceiver
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

Functional description
The transmit section of the NTR2 consists of a frequency modulated Voltage Controlled Crystal Oscillator
(VCXO) feeding a frequency multiplier with two stage amplifier and RF filter. Final Power Amplifier stage is
factory pre-set to appropriate band power level. Operation can be controlled by the TXE line. The transmitter
achieves full RF output typically within 5ms of this line being pulled low. The RF output is filtered to ensure
compliance with the appropriate radio regulations and fed to the 50Ω antenna pin. The RF output is filtered
to ensure compliance with the appropriate radio regulations and fed via a fast Tx/Rx changeover switch to
the 50Ω antenna pin.
The receive section is a double conversion NBFM superhet with IF at 21.4MHz and 455kHz fed by a Low
Noise Amplifier (LNA) on the RF front-end. Quadrature detector output is available as Audio Frequency
(AF) output and transmitted digital data is regenerated from AF using adaptive data slicer. A Received Signal
Strength Indicator (RSSI) output with some 60dB of range is provided.
User interface
Figure 2: NTR2 pin-out and dimension
Notes: 1. TXE has 47kΩ internal pullup to 2.8V
Radiometrix Ltd.,
24.1mm
NTR2 pin
1
2
3
4
5
6
7
8
9
2. Compatible with NiM2, NRX2 and NTX2.
3. Pinout resembles an NRX2 receiver with 2 added pins ( N_TXE and TXD)
4. There is no complete unit enable pin: the user must switch the Vcc.
5. There are two versions of the interface pinning:
1
Name
RF in/out
RF gnd
RSSI
0V
Vcc
AF
RXD
TXE
TXD
Batten & Allen 'edge leadframe' for vertical SIL mounting
Conventional 0.1" pitch square pin headers for minimum height horizontal mount.
2
7 holes of 0.7mm dia pin spacing 2.54mm (0.1")
30.48mm (1.2")
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
Logic 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 10kΩ pull-up to Vcc (pin 5).
Suitable for bi-phase codes
Low = TX enable (3V CMOS logic)
DC coupled input (3V CMOS logic). R
pk-pk
57.7mm
audio. DC coupled, approx 0.8V bias
NTR2 transceiver data sheet
3
4
5 6
7
8
9
in
= 100kΩ
1 = RF in
2 = RF gnd
3 = RSSI
4 = 0V
5 = Vcc
6 = AF
7 = RXD
8 =
9 = TXD
8mm
TXE
Page 2