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Summary of Contents for Linx Technologies TRM-418-LT
- Page 1 LT Series Transceiver Module Data Guide...
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Page 2: Table Of Contents
Table of Contents Warning: Some customers may want Linx radio frequency (“RF”) products to control machinery or devices remotely, including machinery or devices that can cause death, bodily injuries, and/or property Description damage if improperly or inadvertently triggered, particularly in industrial Features settings or other applications implicating life-safety concerns (“Life and Property Safety Situations”). -
Page 3: Description
General Antenna Rules Common Antenna Styles LT Series Transceiver Module Regulatory Considerations Data Guide Description 0.619" The LT Series transceiver is ideal for the bidirectional wireless transfer of serial data, control or command 0.630" information in the favorable 260–470MHz band. The TRM-433-LT LOT TX4xxx transceiver is capable of generating +10dBm into a... -
Page 4: Ordering Information
Typ. Max. Units Notes Part Number Description Power Supply TRM-315-LT 315MHz Transceiver Operating Voltage TRM-418-LT 418MHz Transceiver Supply Current TRM-433-LT 433MHz Transceiver TX Mode Logic High EVAL-***-LT Basic Evaluation Kit TX Mode Logic High *** = 315, 418 (Standard), 433MHz Transceivers are supplied in tubes of 18 pcs. -
Page 5: Typical Performance Graphs
Typical Performance Graphs LT Series Transceiver Specifications Continued Parameter Symbol Min. Typ. Max. Units Notes Transmitter Section Output Power +9.2 With a 750Ω resistor –4 on LADJ Output Power Control –30 Range Harmonic Emissions –36 Antenna Port RF Input Impedance Ω... - Page 6 18.00 1. 1.00V/div 2. 2.00V/div 16.00 14.00 12.00 10.00 TX Icc 8.00 RX Icc 6.00 4.00 DATA 2.00 0.00 3.60 3.50 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 2.50 2.40 2.30 2.20 2.10 500µS/div Supply Voltage (V) [LADJ = 0] Figure 8: Current Consumption vs.
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Page 7: Pin Assignments
Pin Assignments 1. 200mV/div 2. 2.00V/div LADJ RSSI Carrier A REF T/R SEL ANALOG DATA 200µS/div Figure 14: TX Turn-On Time from PDN Figure 17: LT Series Transceiver Pinout (Top View) Pin Descriptions 1. 200mV/div 2. 2.00V/div Pin Descriptions Pin Number Name I/O Description Ω... -
Page 8: Module Description
Module Description filtered and then amplified by an NMOS cascode Low Noise Amplifier (LNA). The signal is then down-converted to a 10.7MHz Intermediate The LT Series transceiver is a low-cost, high-performance synthesized Frequency (IF) by mixing it with a low-side Local Oscillator (LO). The LO AM OOK transceiver capable of transmitting and receiving serial data at frequency is generated by a Voltage Controlled Oscillator (VCO) which is up to 10,000bps over line-of-site distances of up to 3,000 feet (1000m). -
Page 9: Using Ladj
Using LADJ Using the PDN Line The Level Adjust (LADJ) line allows the transceiver’s output power to be The Power Down (PDN) line can be used to power down the transceiver easily adjusted for range control, lower power consumption, or to meet without the need for an external switch. -
Page 10: Using The Data Line
Using the Data Line -102 The CMOS-compatible DATA line is used for both the transmitter data and -104 Lower Sensitivity, Less Hash the recovered receiver data. Its function is controlled by the state of the -106 T/R_ SEL line, so it is an input when in transmit mode and an output when in receive mode. -
Page 11: Transferring Data
Transferring Data Typical Applications Once a reliable RF link has been established, the challenge becomes how The LT Series transceiver does not perform any encoding or decoding of to effectively transfer data across it. While a properly designed RF link the data, so the designer has a great deal of flexibility in the design of a provides reliable data transfer under most conditions, there are still distinct protocol for the system. -
Page 12: Antenna Considerations
Antenna Considerations Helpful Application Notes from Linx The choice of antennas is a It is not the intention of this manual to address in depth many of the issues critical and often overlooked that should be considered to ensure that the modules function correctly design consideration. -
Page 13: Interference Considerations
Interference Considerations Pad Layout The RF spectrum is crowded and the potential for conflict with unwanted The pad layout diagram in Figure 26 is designed to facilitate both hand and sources of RF is very real. While all RF products are at risk from automated assembly. -
Page 14: Microstrip Details
Microstrip Details Make sure internal wiring is routed away from the module and antenna and is secured to prevent displacement. A transmission line is a medium whereby RF energy is transferred from one place to another with minimal loss. This is a critical factor, especially Do not route PCB traces directly under the module. -
Page 15: Production Guidelines
Production Guidelines Reflow Temperature Profile The single most critical stage in the automated assembly process is the The module is housed in a hybrid SMD package that supports hand and reflow stage. The reflow profile in Figure 31 should not be exceeded automated assembly techniques. - Page 16 General Antenna Rules plane as possible in proximity to the base of the antenna. In cases where the antenna is remotely located or the antenna is not in close The following general rules should help in maximizing antenna performance. proximity to a circuit board, ground plane or grounded metal case, a metal plate may be used to maximize the antenna’s performance.
- Page 17 Common Antenna Styles Loop Style A loop or trace style antenna is normally printed There are hundreds of antenna styles and variations that can be employed directly on a product’s PCB (Figure 38). This with Linx RF modules. Following is a brief discussion of the styles most makes it the most cost-effective of antenna commonly utilized.
- Page 18 Excerpts of applicable sections are included While some extra cost and design effort are required to address these with Linx evaluation kits or may be obtained from the Linx Technologies issues, the additional usefulness and profitability added to a product by RF website, www.linxtechnologies.com.
- Page 19 Under no circumstances shall any user be conveyed any license or right to the use or ownership of such items. ©2015 Linx Technologies. All rights reserved. The stylized Linx logo, Wireless Made Simple, WiSE, CipherLinx and the stylized CL logo are trademarks of Linx Technologies.
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