Features

Matching to the Receiver Antenna

Strength Indicator)

end Filter, up to 40 dB is thereby Achievable with Newer SAWs

Microcontroller

Description

The T5744 is a PLL receiver device for the receiving range of f

450 MHz. It is developed for the demands of RF low-cost data communication sys-

tems with low data rates and fits for most types of modulation schemes including

Manchester, Biphase and most PWM protocols. Its main applications are in the areas

of telemetering, security technology and keyless-entry systems.

Figure 1. System Block Diagram

Demod.

IF Amp

LNA

VCO

PLL

XTO

Data

interface

T5744

1...3

µC

Power

amp.

XTO

VCO

PLL

U2741B

Antenna Antenna

UHF ASK/FSK

Remote control transmitter

UHF ASK

Remote control receiver

Encoder

M44Cx9x

1 Li cell

Keys

UHF ASK

Receiver

T5744

Rev. 4521B–RKE–01/03