ELSEMA 433.920MHz ASK Radio Data Receiver , R43305 R43305 433.920 MHz ASK RADIO DATA RECEIVER Features • Receives digital data • Baud rates 300 - 4800bps • Low cost, small size, low current consumption Application • Telecommand Systems • Security Systems • Alarms • Radio Data Communications • Commercial / Industrial Telemetry Description The R43305 is a radio data receiver to receive digital data. Baud rates of 300 to 4800 bps can be received. The low cost, small size, low current consumption makes it ideal for various applications. Technical Data Supply Voltage 4.5 - 5.5 VDC Absolute maximum 6.5VDC. Current Consumption 2.5mA Receiver Type Single Conversion Superheterodyne Receiving Freq 433.920MHz (Other frequencies available on request. Refer to the table below ) Oscillation System VCO with 10ppm Crystal Controlled reference Oscillator Operating Temperature Range -5 to 50°C IF Freq 320KHz Selectivity -3dB at ±20kHz Sensitivity Better than -107dBm or 1µV Type of Demodulation Amplitude Shift Keying. (ASK) Baud Rate 300 to 4800 bps with 50% duty cycle Data Output Level 0-5V Frequency Response 150 to 2400 Hz with 50% duty cycle (Other duty cycles will degrade sensitivity) Dimension 39 x 25 x 12mm Weight 15 grams Usable Transmitter T433 Data Transmitter Antenna 50 ohms, 433MHz Antenna ELSEMA 433.920MHz ASK Radio Data Receiver , R43305 Available Frequencies SF2 SF3 SF4 SF5 SF6 SF7 SF8 SF9 433.664 MHz 433.408 MHz 433.152 MHz 434.688MHz 434.432 MHz 434.176MHz 433.792 MHz 434.304 MHz Please quote Correct SF number when ordering transmitters on special frequencies. Connections R43305 Data Format It is important to input the correct data format otherwise the receiver will have a lower sensitivity which will result in a reduced transmission range. The R43305 receiver data slicer is set for 50/50-duty cycle, therefore the “data in” should have a 50/50-duty cycle. The 50/50-duty cycle data can be pulse-width modulated to transmit resets, 0's or 1's. See diagram below : A 50/50-duty cycle will have an average DC signal resulting in a constant reference for the data slicer. Users should use pulse-width modulation to transmit data with logic 1's or 0's. If a different duty cycle is used, for example 66/33 ( Manchester format) the data slicer in the receiver will try to adjust itself to the average DC signal. Since this average DC signal is changing with different data bits this will result in a constantly changing reference for the data slicer, resulting in lower sensitivity. See diagram below : ELSEMA 433.920MHz ASK Radio Data Receiver , R43305 *Only 50/50 duty cycle data is suitable for the T433 transmitter and R43305 receiver. Manufactured by Elsema Pty Ltd 3/10 Hume Rd, Smithfield NSW 2164 Ph: 02 9609 4668 Fax: 02 9725 2663 Website: http://www.elsema.com