Linx TRM-315-LT Data Manual

Lt series transceiver module

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WIRELESS MADE SIMPLE
LT SERIES TRANSCEIVER MODULE DATA GUIDE
DESCRIPTION
The LT Series transceiver is ideal for the bi-
directional wireless transfer of serial data, control, or
command information in the favorable 260-470MHz
band. The transceiver is capable of generating
+10dBm into a 50-ohm load and achieves an
outstanding typical sensitivity of -112dBm. Its
advanced
synthesized
architecture
outstanding stability and frequency accuracy, and
minimizes the effects of antenna pulling. When
paired, the transceivers form a reliable wireless link
that is capable of transferring data at rates of up to
10,000bps over distances of up to 3,000 feet.
Applications operating over shorter distances or at
lower data rates will also benefit from increased link reliability and superior noise
immunity. Housed in a tiny reflow-compatible SMD package, the transceiver requires
no external RF components (except an antenna), which greatly simplifies integration
and lowers assembly costs.
FEATURES
n Long range
n Low cost
n PLL-synthesized architecture
n Direct serial interface
n Data rates to 10,000bps
n No external RF components required
APPLICATIONS INCLUDE
n 2-Way Remote Control
n Keyless Entry
n Garage / Gate Openers
n Lighting Control
n Medical Monitoring / Call Systems
n Remote Industrial Monitoring
n Periodic Data Transfer
n Home / Industrial Automation
n Fire / Security Alarms / Access Control
n Remote Status / Position Sensing
n Long-Range RFID
n Wire Elimination
TRM-315-LT
TRM-418-LT
TRM-433-LT
®
0.619"
RF MODULE
0.630"
TRM-433-LT
delivers
LOT 10000
0.125"
Figure 1: Package Dimensions
n Low power consumption
n Compact surface-mount package
n Wide temperature range
n RSSI and power-down functions
n No production tuning
n Easy to use
ORDERING INFORMATION
PART #
DESCRIPTION
TRM-315-LT
Transceiver 315MHz
TRM-418-LT
Transceiver 418MHz
TRM-433-LT
Transceiver 433MHz
EVAL-***-LT
Basic Evaluation Kit
*** = Frequency
Transceivers are supplied in tubes of 33 pcs.
Revised 3/23/10

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  • Page 1 TRM-315-LT TRM-418-LT TRM-433-LT ® WIRELESS MADE SIMPLE LT SERIES TRANSCEIVER MODULE DATA GUIDE DESCRIPTION The LT Series transceiver is ideal for the bi- 0.619" directional wireless transfer of serial data, control, or command information in the favorable 260-470MHz band. The transceiver is capable of generating...
  • Page 2: Electrical Specifications

    – Operating Temperature °C RF SECTION Storage Temperature +150 °C Frequency Range: Soldering Temperature +260°C for 10 seconds TRM-315-LT – – – TRM-418-LT – – – *NOTE* Exceeding any of the limits of this section may lead to permanent TRM-433-LT –...
  • Page 3: Typical Performance Graphs

    TYPICAL PERFORMANCE GRAPHS TYPICAL PERFORMANCE GRAPHS 1. 1.00V/div 2. 2.00V/div DATA 12.00 9.00 6.00 3.00 0.00 -3.00 -6.00 -9.00 -12.00 -15.00 -18.00 -21.00 2.00mS/div Output Power (dBm) Output Power (dBm) Figure 9: RX Turn-On Time from V Figure 3: Output Power vs. LADJ Resistance Figure Output Power...
  • Page 4: Pin Assignments

    TYPICAL PERFORMANCE GRAPHS PIN ASSIGNMENTS 1. 200mV/div 2. 2.00V/div LADJ RSSI Carrier A REF T/R SEL ANALOG DATA 200µS/div Figure 13: TX Turn-On Time from PDN Figure 16: LT Series Transceiver Pinout (Top View) 1. 200mV/div 2. 2.00V/div PIN DESCRIPTIONS Pin # Name Description...
  • Page 5: Power Supply Requirements

    POWER SUPPLY REQUIREMENTS 50Ω RF IN (Antenna) Band Select 10.7MHz Data Slicer The module does not have an internal voltage regulator; therefore it requires a 0° Filter IF Filter RX Data ∑ clean, well-regulated power source. While it is preferable to power the unit from Limiter a battery, it can also be operated from a power supply as long as noise is less 90°...
  • Page 6: Transferring Data

    This noise can be handled in software by implementing a noise- precisely adjust the output power to the maximum level allowed by law. The tolerant protocol as described in Linx Application Note AN-00160. If a software variable resistor’s value can be noted and a fixed resistor substituted for final solution is not appropriate, then the transceiver can be squelched.
  • Page 7: Interference Considerations

    The LT Series transceiver is ideal for the wireless transfer of serial data, control, Linx RF modules do not encode or packetize the signal content in any manner. or command data. The transceiver does not perform any encoding or decoding...
  • Page 8: Board Layout Guidelines

    This is a critical factor, especially in high- Linx in designing the modules, integrating them is straightforward. Despite this frequency products like Linx RF modules, because the trace leading to the ease of application, it is still necessary to maintain respect for the RF stage and module’s antenna can effectively contribute to the length of the antenna,...
  • Page 9 Absolute Maximum Solder Times Washability The modules are wash resistant, but are not hermetically sealed. Linx Hand-Solder Temp. TX: +255°C for 10 Seconds recommends wash-free manufacturing; however, the modules can be subjected to a wash cycle provided that a drying time is allowed prior to applying electrical Hand-Solder Temp.
  • Page 10: Antenna Considerations

    FCC compliance. and the corresponding sacrifice in performance accepted. Linx transmitters are capable of achieving output power in excess of some legal 3. If an internal antenna is to be used, keep it away from other metal components, limits.
  • Page 11 There are literally hundreds of antenna styles and variations that can be ® employed with Linx RF modules. Following is a brief discussion of the styles most commonly utilized. Additional antenna information can be found in Linx Application Notes AN-00100, AN-00140, AN-00500, and AN-00501. Linx antennas and connectors offer outstanding performance at a low price.
  • Page 12: Legal Considerations

    AN-00130 Modulation Techniques for Low-Cost RF Data Links of the module to your application. All Linx modules are designed with the approval process in mind and thus much of the AN-00140 The FCC Road: Part 15 From Concept to Approval frustration that is typically experienced with a discrete design is eliminated.
  • Page 13 Disclaimer Linx Technologies is continually striving to improve the quality and function of its products. For this reason, we reserve the right to make changes to our products without notice. The information contained in this Data Guide is believed to be accurate as of the time of publication. Specifications are based on representative lot samples.

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Trm-418-ltTrm-433-lt

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