TX2A RADIOMETRIX [Radiometrix Ltd], TX2A Datasheet - Page 2
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TX2A
Manufacturer Part Number
TX2A
Description
UHF FM Data Transmitter and Receiver Modules
Manufacturer
RADIOMETRIX [Radiometrix Ltd]
Datasheet
1.TX2A.pdf
(10 pages)
Pin description:
RF GND
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
50 RF output to the antenna. Internally DC-
isolated. See antenna section of apps notes for
details of suitable antennas.
En
Tx enable. <0.15V shuts down module (current
<1A). >1.7V enables the transmitter.
Impedance ~1M. Observe slew rate
requirements (see apps notes).
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 RX2G module is a single conversion FM superhet receiver capable of handling data rates of up to 64kbps.
RX2G needs a regulated 5V supply and draws 10mA when receiving. The RX2G features a fast power-up time
for effective duty cycle power saving and a signal strength (RSSI) output with 50dB of range. Full screening and
a SAW front-end filter give good immunity to interference. The SIL style RX2G measures 48 x 17.5 x 4.5 mm
excluding the pins.
TX2A transmitter
Fig. 2: TX2A block diagram
Vcc
+2.2V to +16V DC supply. Max ripple content 0.1V
0V
DC supply ground. Internally connected to pins 1 & 3 and module screen.
TXD
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 (>100k).
Notes: 1. The 3V and 5V supply variant TX2As intended for direct replacement to our SAW based TX2
Radiometrix Ltd, TX2A/RX2G Data Sheet
RF out
3
RF gnd
1
2
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
433.92 MHz
band pass
filter
(pins 1&3)
(pin 2)
(pin 4)
(pin 5)
(pin 6)
(pin 7)
buffer
V C O
P-P
Filter
Loop
12.0
mm
. Decoupling is not generally required.
32
TX2A
1 2
7 holes, 0.7 mm dia, pin spacing 2.54 mm
3
Fig 3: TX2A physical dimensions
15.24 mm
32 mm
Radiometrix
regulator
supply
osc
ref
4
5
6
7
35kHz
12.5
mm
LPF
PCB level
7 = TXD
1 = RF GND
2 = RF OUT
3 = RF GND
4 = En
5 = Vcc
6 = 0V
2.2 -- 16V
TXD
En
3.8 mm
5
0V
4
7
6
page 2