DS012_1

Oct 00

©2000 REG No 277 4001, ENGLAND.

Page 1

AM-TX1-XXX

FEATURES

APPLICATIONS

• CAR ALARM KEYFOBS

• REMOTE TRANSMITTER ENCODERS

• 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

TX1

Module

TX1

Module

+

-

220pF

Rd

Signal

from

Encoder

circuit

drive

current

drive

Voltage

Rd

Signal

from

Encoder

circuit

drive

current

drive

Voltage

RF GND

RF GND

220pF

Driving TX1 from Current Source

Driving TX1 from - Current Sink