RX2-433 데이터 시트보기 (PDF) - Radiometrix Ltd

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RX2-433

UHF FM Data Transmitter and Receiver Modules

Radiometrix Ltd 

RX2 receiver:

418 MHz SAW-

controlled

1st Local oscillator

2nd local

oscillator

15.82 MHz

Vcc (5)

2µF

CD (3)

RF in (1) 433 MHz band

pass filter

pre -

amplifier

SAW band

pass filter

1st mixer

RF gnd (2)

2nd mixer

IF amlpifier

AF 91 kHz

demodulator

buffer

AF (6)

adaptive data slicer

+

Data out (7)

-

0 VOLT (4)

Pin description

Fig. 3: RX2 block diagram

RF in

(pin 1)

50Ω RF input from the antenna, it is

DC isolate internally. (see antenna

section for suggested antenna/feeds).

RF GND

(pin 2)

RF ground pin, internally connected to

the module screen and pin 4 (0V). This

pin should be connected to the RF

return path (e.g. coax braid, main

PCB ground plane etc.)

CD

(pin 3)

Fig. 4: physical dimensions

The Carrier Detect may be used to drive an external PNP transistor to obtain a logic level carrier detect

signal, see test circuit. If not required it should be connected to pin 5 (Vcc).

0 Volt

(pin 4)

Supply ground connection, connected to pin 1 and screen.

Vcc

(pin 5)

+ve supply pin. +3.0V to +6.0V @ <17mA . The supply must be clean < 2mVP-P ripple. A 10µF de-

coupling capacitor and 10Ω series resistor is recommended if a clean supply is not available.

AF

(pin 6)

This is a buffered and filtered analogue output from the FM demodulator. It has a standing DC bias of

1.2V and 400mV P-P base band signal. It is useful as a test point or to drive linear decoders. Load

impedance should be > 2kΩ and < 100pF.

RXD

(pin 7)

This digital output from the internal data slicer is a squared version of the signal on pin 6 (AF). It may

be used to drive external decoders. The data is true data, i.e. as fed to the transmitter. Load impedance

should be > 1kΩ and < 1nF

Radiometrix Ltd., TX2 & RX2 Data Sheet

page 3

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