Atmel's new RF data control receiver is claimed to be easy to use and thus simplify design-ins. The receiver is transparent, which means that incoming data is directly forwarded to the output, the conventional first-time data validation and comparison is done by an external microcontroller. The T5744 is an ASK (amplitude shift keying) receiver and a fit for almost all kinds of modulations schemes including Manchester, Biphase and most PWM protocols. The device comes in SO20 and SSO20 packages.
The T5744 operates from 300 MHz to 450 MHz and is designed for the demands of low-cost RF data communication systems with data rates of 10 kHz maximum, offering high sensitivity especially at these low data rates. An on-board RSSI (received signal strength indicator) output distinguishes the signal strength of the received signals.
Atmel has targeted the T5744 at industrial and consumer applications such as data transmission and remote keyless entry systems (garage door opener or car opener, telemetering etc), also wireless entertainment devices like keyboards and mice, as well as TV, VCR, DVD and audio remote controls.
Atmel says that to create a complete RF data communication system, the receiver IC operates together with its RF PLL transmitters, the U274xB and T575x. As programming is not necessary, the circuit is easy to use in any application and design-ins can be completed quickly. The single-ended RF input allows unproblematic adaptation to a l/4 wave antenna or to a printed antenna on the board, requiring only a few external circuits and almost no RF components on the board.
The replacement of currently used RF receivers by the T5744 is very simple, says the manufacturer; only two pins, the data pin and the standby pin, have to be connected to a microcontroller. To reduce the current consumption of 7 mA to 190 µA, the device can be switched via the standby pin into sleep mode where only the crystal oscillator is still running to enable a fast start-up.
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