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R43305
433.920MHz ASK Radio Data Receiver
Features
• Receivers digital data
• Baud rates 300 - 4800bps
• Low cost, small size, low current consumption
Applications
• Telecommand Systems
• Security Systems
• Alarms
• Radio Data Communications
• Commercial / Industrial Telemetry |
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 Download Datasheet
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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 to 5.5 Volts DC. 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) |
| Occupied Band Width |
25KHz at -20dB. |
| 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 |
Available Frequencies
SF2 |
433.664 MHz |
SF3 |
433.408 MHz |
SF4 |
433.152 MHz |
SF5 |
434.688 MHz |
SF6 |
434.432 MHz |
SF7 |
434.176 MHz |
SF8 |
433.792 MHz |
SF9 |
434.304 MHz |
Please quote Correct SF number when ordering transmitters on special frequencies.
Connection Diagram
* For R43305 without label, the red dot represents +5V supply.
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 :
*Only 50/50 duty cycle data is suitable for the T433 transmitter and R43305 receiver.
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