AM RF T
RANSMITTER
M
ODULE
.
FEATURES
AM-TX1-XXX
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MINIATURE MODULE (7.5 x 11.5 X 4.5mm)
SAW CONTROLLED FREQUENCY STABILITY
NO ADJUSTABLE COMPONENTS.
TRANSMITTING RANGE UP TO 30 METRES.
CMOS/TTL COMPATIBLE INPUT.
CURRENT CONSUMPTION 2.5mA (typ).
SINGLE SUPPLY VOLTAGE 2.5 -12V.
COMPATIBLE WITH R.F. SOLUTIONS AM RECEIVER.
MPT1340 LICENCE EXEMPT.
AVAILABLE AS EITHER 418MHz OR 433MHz.
APPLICATIONS
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CAR ALARM KEYFOBS
REMOTE TRANSMITTER ENCODERS
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GARAGE DOOR OPENERS
REMOTE GATE SYSTEMS
DESCRIPTION
The R.F. Solutions AM Transmitter module offers a miniature hybrid modular RF transmitter providing on-off
keyed modulation, which can be used to transmit data from any standard CMOS/TTL source up to 1200
baud.
The module is very simple to operate, requiring only two connections (see application circuit below). The
module is also very efficient, using only 2.3mA (
typ) which means that it may be driven directly from an
encoder I/C or microcontroller. The output impedance has been designed to give optimum performance when
coupled with a small antenna such as a tuned loop or short whip.
The modules are compatible with the AM Receiver modules (AM -HRRn-XXX or AM-RRS2-XXX).
The transmitter module is type approved to MPT1340 for use in general telemetry and telecommunications
products, when used with the antenna as listed overleaf.
APPLICATION CIRCUIT
Driving TX1 from Current Source
Signal
from
Encoder
circuit
Driving TX1 from - Current Sink
Rd
drive
current
drive
Voltage
220pF
+
TX1
Module
-
RF GND
RF GND
drive
Voltage
220pF
TX1
Module
Signal
from
Encoder
circuit
Rd
drive
current
DS012_1
Oct 00
©2000
REG No 277 4001, ENGLAND.
Page 1
RFSOLUTIONS [ RFSOLUTIONS.LTD ]
