TX2A RADIOMETRIX [Radiometrix Ltd], TX2A Datasheet - Page 3

• Manufacturer Part Number: TX2A
• Description: UHF FM Data Transmitter and Receiver Modules
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

Pin description
RF IN
50 input from the antenna, DC isolated.
RF GND
RF ground pins, internally connected to
the module screen and pin 6 (0V). This
pin should be connected to the RF return
path (coax braid, main PCB ground plane
etc.)
RF GND
Not fitted on non-regulator 5V variant
RX2G receiver
En (Regulator version) (pin 4)
Rx enable. <0.15V shuts down module (current <1uA). >1.7V enables the receiver. Impedance ~1Mohm.
Observe slew rate requirements (see apps notes).
Not fitted on non-regulator 5V variant.
RSSI
Received signal strength indicator with 60dB range. See page 4 for typical characteristics.
GND
DC supply ground. Internally connected to pin 2 & 3 and module screen.
Vcc
5V regulated DC supply. Max ripple content 0.1V
Vcc (for regulator version)
+4.5V to +16.0V DC supply. Max ripple content 0.1Vp-p. Decoupling is not generally required.
AF out (pin 8)
Buffered and filtered analogue output from the FM demodulator. Standing DC bias 2V approx. External load
should be >10k // <100pF.
RXD
This digital output from the internal data slicer is a squared version of the signal on pin 8 (AF). It may be used
to drive external decoders. The data is true data, i.e. as fed to the transmitter.
Radiometrix Ltd, TX2A/RX2G Data Sheet
(pin 1)
(pin 2)
(pin 3)
(pin 5)
(pin 6)
(pin 7)
(pin 9)
(pin 7)
p-p
.
Fig 4: physical dimensions & pin outs
page 3