Rainbow Electronics T5744 - Manual

1
Features
• Minimal External Circuitry Requirements, no RF Components on the PC Board Except
Matching to the Receiver Antenna
• High Sensitivity, Especially at Low Data Rates
• SSO20 and SO20 package
• Fully Integrated VCO
• Supply Voltage 4.5 V to 5.5 V, Operating Temperature Range -40°C to 105°C
• Single-ended RF Input for Easy Adaptation to l/4 Antenna or Printed Antenna on PCB
• Low-cost Solution Due to High Integration Level
• Various Types of Protocols Supported (i.e., PWM, Manchester and Biphase)
• Distinguishes the Signal Strength of Several Transmitters via RSSI (Received Signal
Strength Indicator)
• ESD Protection According to MIL-STD. 883 (4KV HBM)
• High Image Frequency Suppression Due to 1 MHz IF in Conjunction with a SAW Front-
end Filter, up to 40 dB is thereby Achievable with Newer SAWs
• Power Management (Polling) is Possible by Means of a Separate Pin via the
Microcontroller
• Receiving Bandwidth BIF = 600 kHz
Description
The T5744 is a PLL receiver device for the receiving range of f
0
= 300 MHz to
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
Preliminary
Rev. 4521A–RKE–02/02