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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 delivers
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.

LT SERIES TRANSCEIVER MODULE DATA GUIDE

WIRELESS MADE SIMPLE

®

Revised 3/23/10

Figure 1: Package Dimensions

0.125"

0.6

3

0"

0.619"

LOT 10000

TRM-433-LT

RF MODULE

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

APPLICATIONS INCLUDE

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

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

FEATURES

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.

ORDERING INFORMATION

TRM-

3

15-LT

TRM-418-LT
TRM-4

33

-LT

Содержание TRM-315-LT

Страница 1: ...fies integration and lowers assembly costs LT SERIES TRANSCEIVER MODULE DATA GUIDE WIRELESS MADE SIMPLE Revised 3 23 10 Figure 1 Package Dimensions 0 125 0 630 0 619 LOT 10000 TRM 433 LT RF MODULE 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 Fi...

Страница 2: ...112 118 dBm 7 RSSI Analog Dynamic Range 80 dB 9 Analog Bandwidth 20 5 000 Hz 9 Gain 15 mV dB 9 Voltage with No Carrier 430 mV 9 TRANSMITTER SECTION Output Power PO 9 2 11 dBm 1 6 With a 750Ω resistor on LADJ PO 4 0 0 4 dBm 2 6 Output Power Control Range 30 MAX dB 9 Harmonic Emissions PH 36 dBc 6 ANTENNA PORT RF Input Impedance RIN 50 Ω 9 TIMING Receiver Turn On Time Via VCC 2 2 mSec 8 9 Via PDN 0 ...

Страница 3: ... Turn On Time from VCC Figure 10 RX Turn On Time from PDN Figure 6 Current Consumption vs Supply TYPICAL PERFORMANCE GRAPHS 0 0 2 0 4 0 6 0 8 1 1 2 1 4 1 6 115 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 RF IN dBm VRSSI V Figure 5 RSSI Curve 1 1 00V div 2 2 00V div 500µS div 1 2 PDN DATA 1 1 00V div 2 2 00V div 2 00mS div 1 2 DATA VCC 1 1 00V div 2 2 00V div 200µS div 1 2 Carrier T R SEL...

Страница 4: ...gnal Strength Indicator This line will supply an analog voltage proportional to the received signal strength 5 A REF Analog RMS Average Voltage Reference 6 ANALOG Recovered Analog Output 7 DATA Digital Data Line This line will output the received data when in Receive Mode and is the data input when in Transmit Mode 8 T R SEL Transmit Receive Select Pull this line low to place the transceiver into ...

Страница 5: ... be used to save system power by waking up external circuitry when a transmission is received or crosses a certain threshold The RSSI output feature adds tremendous versatility for the creative designer 10Ω 10μF Vcc IN Vcc TO MODULE Figure 19 Supply Filter THEORY OF OPERATION The LT Series transceiver sends and recovers data by AM or Carrier Present Carrier Absent CPCA modulation also referred to ...

Страница 6: ...e averaged over a 100mS time frame Because OOK modulation activates the carrier for a 1 and deactivates the carrier for a 0 a data stream that sends more 0 s will have a lower average output power over 100mS This allows the instantaneous output power to be increased thus extending range USING THE DATA LINE The CMOS compatible DATA line is used for both the transmitter data and the recovered receiv...

Страница 7: ...nal content in any manner The received signal will be affected by such factors as noise edge jitter and interference but it is not purposefully manipulated or altered by the modules This gives the designer tremendous flexibility for protocol design and interface Despite this transparency and ease of use it must be recognized that there are distinct differences between a wired and a wireless enviro...

Страница 8: ...aced close to the module s VCC line In some instances a designer may wish to encapsulate or pot the product Many Linx customers have done this successfully however there are a wide variety of potting compounds with varying dielectric properties Since such compounds can considerably impact RF performance it is the responsibility of the designer to carefully evaluate and qualify the impact and suita...

Страница 9: ...echniques however due to their hybrid nature certain aspects of the assembly process are far more critical than for other component types Following are brief discussions of the three primary areas where caution must be observed Reflow Temperature Profile The single most critical stage in the automated assembly process is the reflow stage The reflow profile below should not be exceeded since excess...

Страница 10: ...ergonomic reasons thus an alternative antenna style such as a helical loop or patch may be utilized and the corresponding sacrifice in performance accepted 3 If an internal antenna is to be used keep it away from other metal components particularly large items like transformers batteries PCB tracks and ground planes In many cases the space around the antenna is as important as the antenna itself O...

Страница 11: ...ause consistency issues during production In addition printed styles are difficult to engineer requiring the use of expensive equipment including a network analyzer An improperly designed loop will have a high SWR at the desired frequency which can cause instability in the RF stage Linx offers low cost planar and chip antennas that mount directly to a product s PCB These tiny antennas do not requi...

Страница 12: ... profitability added to a product by RF makes the effort more than worthwhile NOTE Linx RF modules are designed as component devices that require external components to function The modules are intended to allow for full Part 15 compliance however they are not approved by the FCC or any other agency worldwide The purchaser understands that approvals may be required prior to the sale or operation o...

Страница 13: ...he limitations on Linx Technologies liability are applicable to any and all claims or theories of recovery asserted by Customer including without limitation breach of contract breach of warranty strict liability or negligence Customer assumes all liability including without limitation liability for injury to person or property economic loss or business interruption for all claims including claims ...

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