RCT-433-AS

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RCT-433-AS - RCT-433-AS

RCT-433-AS
Embedding wireless future.
Low-Cost SAW-stabilized surface mount transmitter
Remote Keyless Entry (RKE) Remote Lighting Controls On-Site Paging Asset Tracking Wireless Alarm Security Systems Long Range RFID Automated Resource Management
Features
315/418/433.92 versions Cost 1.5-12V operation current consumption Small size. 0dBm output power 4800 baud operation
Description
RCT-433-AS ideal remote control applications where cost longer range required. transmitter operates from 1.5-12V supply, making ideal battery-powered applications. transmitter employs SAWstabilized oscillator, ensuring accurate frequency control best range performance. Output power harmonic emissions easy control, making ETSI compliance easy. manufacturing-friendly style package lowcost make RCT-433-AS suitable high volume applications. RCT-433-ASB suitable reflow ovens soldering.
RCT-433-AS
RCT-433-ASB
Ordering Information
Frequency 433.92 433.92 Part Number RCT-433-AS RCT-433-ASB
Domestic international orders:
Mouser Electronics 1-800-346-6873 (http://www.mouser.com) Future Electronics
Radiotronix Representative your area please visit www.radiotronix.com visit corporate information page.
Document Control
Created Engineering Review Marketing Review Approved Engineering Approved Marketing Steve Montgomery Marks Bryan Montgomery Marks Bryan Montgomery 05/21/02 8/21/03 8/21/03 8/21/03 8/21/03
Revision History
Revision 1.1.0 1.2.0 1.3.0 1.4.0 Author Date 05/21/02 07/30/03 8/21/03 6/7/05 Description Document Created Revision Revision. Added troubleshooting design tips. Added RCT-433-ASB specification datasheet.
RCT-433-AS
Low-Cost SAW-stabilized surface mount transmitter
2001,2002,2003 Rights Reserved
Diagram
Description
Name Description
DATA
antenna output. antenna port impedance affects output power harmonic emissions. low-pass filter needed sufficiently filter harmonic emissions. Transmitter ground. Connect ground plane. Digital data input. This input CMOS compatible should driven with CMOS level inputs. provides operating voltage transmitter. should bypassed with .01uF ceramic capacitor filtered with 4.7uF tantalum capacitor. Noise power supply will degrade transmitter noise performance.
Mechanical Drawing
0.30"
Figure Mechanical Drawing RCT-433-AS Figure Suggested Layout
Figure Mechanical Drawing RCT-433-ASB
Figure Suggested Layout
6/7/2005
RCT-433-AS
Low-Cost SAW-stabilized surface mount transmitter
2001,2002,2003 Rights Reserved
RCT-433-ASB Reflow Details
RCT-433-ASB suitable reflow ovens heat guns. prevent damage module through excess heat, reflow oven temperature profiling very important. suggested oven profile detailed figure below.
Figure RCT-433-ASB Reflow Oven Temperature Profile
Absolute Maximum Ratings
Parameter Power Supply Input Pins Storage Temperature Soldering Temperature (10sec)1 -0.3 Units
NOTES RCT-433-AS hand solder only. Transmitter suitable reflow soldering. RCT-433-ASB suitable reflow soldering.
6/7/2005
RCT-433-AS
Low-Cost SAW-stabilized surface mount transmitter
2001,2002,2003 Rights Reserved
Detailed Electrical Specifications
Parameter (General) Operating Voltage Operating Current DATA=VCC Operating Current DATA=GND Frequency Accuracy Center Frequency Symbol
Typ. 315.0 418.0 433.92
-+75
Units Volts
Notes
RCT-315-AS RCT-418-AS RCT-433-AS
TOLfc
Output Power Baud Rate
-4800
Theory Operation
Modulation
modulation binary form amplitude modulation. When logical (data line low) being sent, transmitter off, fully suppressing carrier. this state, transmitter current very low, less than 1mA. When logical being sent, carrier fully this state, module current consumption highest, about 4.5mA with power supply. modulation method choice remote control applications where power consumption cost primary factors. Because transmitters draw power when they transmit they exhibit significantly better power consumption than transmitters. data rate limited start-up time oscillator. High-Q oscillators which have very stable center frequencies take longer start-up than low-Q oscillators. start-up time oscillator determines maximum data rate that transmitter send. DESIGN HINT "Using RCT-433-AS with microcontroller UART": Data should inverted when using transmitter with UART. normal marking state UART logic which will cause constant transmission. inverting data, transmitter will marking state spacing state (logical ensuring that transmitter only when data being sent. output receiver would also need inverted properly recover data.
6/7/2005
RCT-433-AS
Low-Cost SAW-stabilized surface mount transmitter
2001,2002,2003 Rights Reserved
stabilized oscillator
transmitter basically negative resistance oscillator whose center frequency tightly controlled resonator. (Surface Acoustic Wave) resonators fundamental frequency devices that resonate frequencies much higher than crystals. output oscillator derived directly from collector oscillator transistor. therefore, very sensitive VSWR. module designed work with load, which exhibits VSWR designer must ensure that antenna exhibits more than VSWR guarantee operation. This particularly true trace antennas. module does appear have output antenna port, likely that antenna does meet this requirement. TROUBLESHOOTING HINT: module appears have output antenna port, following: disconnect antenna 1000pF series with resistor ground. This will ensure that transmitter properly loaded. Then look output with scope should oscillator working. working, antenna properly tuned that reason that module working properly. not, then check power supply data input proper voltage levels.
Data Rate
oscillator start-up time order 40uSec, which limits maximum data rate kbit/sec. TROUBLESHOOTING HINT: module appears have good output, your data rate corrupted, that could sign that start-up time oscillator long. load antenna affects oscillator startup time. determine start-up time oscillator, channel digital storage oscilloscope. Attach channel data input channel antenna output (don't worry, won't affect antenna VSWR). Trigger scope rising edge channel Now, toggle data from high capture resulting waveform. should square edge channel oscillator ring-up channel Measure time between rising edge channel when oscillator waveform full voltage swing, have start-up time. determine antenna problem, remove place 1000pF series with 51-ohm resistor ground repeat test. start-up time correct with test load, problem antenna.
Power Supply
RCT-433-AS designed operate from -12V power supply. crucial that this power supply very quiet. power supply should bypassed using 0.01uF low-ESR ceramic capacitor 4.7uF ceramic capacitor. These capacitors should placed close power pins possible.
6/7/2005
RCT-433-AS
Low-Cost SAW-stabilized surface mount transmitter
2001,2002,2003 Rights Reserved
Antenna Output
antenna output. will support most antenna types, including printed antennas integrated directly onto PCB. performance different antennas varies. There many good application notes available that describe external trace antennas. maintain list technical support section website. DESIGN HINT "Antenna traces": time trace longer than 1/8th wavelength frequency carrying, should micro strip. This ensures that proper match maintained between transmitter output antenna. DESIGN HINT "Harmonic Filter": impedance antenna power affects VSWR, power output, harmonic output transmitter. most cases, output transmitter need low-pass filter reduce harmonic emissions. good calculator available line Calculate filter cut-off module's center frequency plus 10%. example, cut-off 433.92 module would about MHz. DESIGN HINT "T-Pad": RCT-433-AS transmitter sensitive unbalanced unmatched loads could fail operate operate intermittently this condition. match your antenna load close ohms possible. T-pad necessary give transmitter close match before your antenna. T-pad will also attenuator. figure below, T-pad match/attenuator circuit.
Figure T-pad Example.
Resistor values this T-pad example are: ohms. ohms.
6/7/2005
RCT-433-AS
Low-Cost SAW-stabilized surface mount transmitter
2001,2002,2003 Rights Reserved
Contact Information
Address: Phone: Fax: www: sales: Industrial Blvd Moore, Oklahoma 73160 405-794-7730 405-794-7477 www.radiotronix.com sales@radiotronix.com
Technical Support Policy
Radiotronix built solid technical support infrastructure that answers your questions when need them. primary technical support tools support forum knowledge base found website. continuously updating these tools. find latest information about these technical support tools, please visit technical support engineers available Mon-Fri between 9:30 4:30 central standard time. best reach technical support engineer send email visiting Support page E-mail support requests given priority because handle them more efficiently that phone support requests. customers that would prefer talk directly support engineer, offer phone support free charge. support requests placed queue returned order that they received.
6/7/2005

RCT-433-AS

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