ATA5744 Datasheet, PDF (1/20 Pages) ATMEL Corporation – UHF ASK Receiver

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
UHF ASK
Receiver
ATA5744
1. Description
The ATA5744 is a PLL receiver device for the receiving range of f₀ = 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, 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
1 Li cell
Encoder
Keys ^ATARx9x
UHF ASK/FSK
Remote control transmitter
UHF ASK
Remote control receiver
U2741B
ATA5744
Demod.
Data
interface
PLL
XTO
VCO
Antenna Antenna
IF Amp
PLL
XTO
1...3 Micro-
controller
Power
amp.
LNA
VCO
Rev. 4893A–RKE–11/05