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 4.5V to 5.5V, 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
Bi-phase)
•
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
1. Description
The ATA5744 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, Bi-phase and most PWM protocols. Its main applications are in the areas
of telemetering, security technology and keyless-entry systems.
Figure 1-1.
System Block Diagram
UHF ASK/FSK
Remote control transmitter
1 Li cell
U2741B
Encoder
PLL
ATARx9x
Keys
XTO
VCO
Power
amp.
UHF ASK
Remote control receiver
ATA5744
Data
Demod.
interface
IF Amp
Antenna Antenna
PLL
XTO
LNA
VCO
UHF ASK
Receiver
ATA5744
= 300 MHz to
0
1...3
Micro-
controller
Rev. 4893A–RKE–11/05