RX2A RADIOMETRIX [Radiometrix Ltd], RX2A Datasheet - Page 2

• Manufacturer Part Number: RX2A
• Description: UHF FM receiver module with RSSI
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

RSSI
Received signal strength indicator with 60dB range. See page 4 for typical characteristics.
0V
DC supply ground. Internally connected to pin 2 and module screen.
Vcc
+2.7V to +16.0V DC supply. Max ripple content 0.1V
AF out
Buffered and filtered analogue output from the FM demodulator. Standing DC bias 1.1V approx.
External load should be >10k // <100pF.
RXD
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, RX2A Data Sheet
Pin description
RF IN
50
isolated
RF GND
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.)
1
RF in
2
RF gnd
input from the antenna, DC
LNA 1
(pin 3)
(pin 4)
(pin 5)
(pin 6)
(pin 7)
(pin 1)
(pin 2)
XTAL OSC.
SAW BPF
433MHz
Crystal
26/28MHz
Phase
detector
LNA 2
16
(Fixed frequency PLL Osc.)
Loop filter
MIXER
Figure 2: RX2A Block diagram
VCO
(f
RF
- 10.7MHz)
10.7MHz
IF1
RX2A
1
regulated
to circuit
+2.8V
2
p-p
7 holes of 0.7 mm dia. pin spacing 2.54mm
Figure 3: Physical dimensions
. Decoupling is not generally required.
10.7MHz IF filter
30.48 mm
regulator
dropout
Low
48 mm
Audio LPF
10.7MHz
IF2/Lim
C
Radiometrix
L
C
R
T
T
3
4
buffer
slicer
data
AF
5
6
7
10k
10.7MHz
ceramic
discriminator
1 = RF IN
2 = RF GND
3 = RSSI
4 = 0V
5 = Vcc
6 = AF out
7 = RXD
PCB level
3
RSSI
4
0V
7
RXD
5
V cc
6
AF out
4.5 mm
page 2