RXM-315-LR

TXM-315-LR TXM-418-LR TXM-433-LR WIRELESS MADE SIMPLE ® LR SERIES TRANSMITTER MODULE DATA GUIDE DESCRIPTION The LR Series transmitter is ideal for the costeffective wireless transfer of serial data, control, or command information in the favorable 260-470MHz band. When paired with a compatible Linx receiver, a reliable wireless link is formed, capable of transferring data at rates of up to 10,000bps at 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. The transmitter’s synthesized architecture delivers outstanding stability and frequency accuracy and minimizes the affects of antenna pulling. Housed in a tiny reflow-compatible SMD package, the transmitter requires no external components (except an antenna), which greatly simplifies integration and lowers assembly costs. 0.360" RF MODULE TXM-418-LR LOT 2000 0.500" 0.130" Typ. Figure 1: Package Dimensions FEATURES Long range Low cost PLL-synthesized architecture Direct serial interface Data rates to 10,000bps No external RF components needed Low power consumption Low voltage (2.1 to 3.6VDC) Compact surface mount package Wide temperature range Power-down function No production tuning APPLICATIONS INCLUDE Remote Control Keyless Entry Garage / Gate Openers Lighting Control Medical Monitoring / Call Systems Remote Industrial Monitoring Periodic Data Transfer Home / Industrial Automation Fire / Security Alarms Remote Status / Position Sensing Long-Range RFID Wire Elimination ORDERING INFORMATION PART # DESCRIPTION TXM-315-LR Transmitter 315MHz TXM-418-LR Transmitter 418MHz TXM-433-LR Transmitter 433MHz RXM-315-LR Receiver 315MHz RXM-418-LR Receiver 418MHz RXM-433-LR Receiver 433MHz EVAL-***-LR Basic Evaluation Kit *** = Frequency Transmitters are supplied in tubes of 50 pcs. Revised 1/28/08 ELECTRICAL SPECIFICATIONS Parameter POWER SUPPLY Operating Voltage Supply Current: Logic High Logic Low Power-Down Current TRANSMITTER SECTION Transmit Frequency Range: TXM-315-LR TXM-418-LR TXM-433-LR Center Frequency Accuracy Output Power Output Power Control Range Harmonic Emissions Data Rate Data Input: Logic Low Logic High Power Down Input: Logic Low Logic High ANTENNA PORT RF Output Impedance TIMING Transmitter Turn-On Time: Via VCC or PDN Modulation Delay ENVIRONMENTAL Operating Temperature Range – -40 – +85 – – – – 1.0 – – 30.0 mSec nS 4 4 4 ROUT – 50 – Ω 4 VIL VIH – VCC-0.25 – – 0.25 – VDC VDC – – VIL VIH – VCC-0.25 – – 0.25 – VDC VDC – – – PO – PH – FC – – – -50 -4 -80 -36 DC 315 418 433.92 – 0.0 – – – – – – +50 +4 +10 – 10,000 MHz MHz MHz kHz dBm dB dBc bps – – – – 2 3 – – IPDN VCC ICC 2.1 – – – – 3.0 3.4 5.1 1.8 5.0 3.6 – – – – VDC mA mA mA nA – 1,2 2 – – Designation Min. Typical Max. Units Notes PERFORMANCE DATA These performance parameters are based on module operation at 25°C from a 3.0VDC supply unless otherwise noted. Figure 2 illustrates the connections necessary for testing and operation. It is recommended all ground pins be connected to the ground plane. VCC GND DATA VCC PDN VCC GND GND 750 LADJ/VCC ANT Figure 2: Test / Basic Application Circuit TYPICAL PERFORMANCE GRAPHS 1. 500mV/div 2. 2.00V/div ASK RF Output 1 TX Data 2 100nS/div Figure 3: Modulation Delay 12 10 LADJ Resistance (kΩ) 8 6 4 °C 2 Table 1: LR Series Transmitter Electrical Specifications Notes 1. 2. 3. 4. With a 50% duty cycle. With a 750Ω resistor on LADJ. See graph on Page 3. Characterized, but not tested. 4.5 0 9.00 6.00 3.00 0.00 -3.00 -6.00 -9.00 Output Power (dBm) -12.00 -15.00 -18.00 -21.00 Figure 4: Output Power vs. LADJ Resistance Current Consumption (mA) ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC Any Input or Output Pin Operating Temperature Storage Temperature Soldering Temperature -0.3 -0.3 -40 -40 +225°C to +3.6 to VCC + 0.3 to +85 to +90 for 10 seconds VDC VDC °C °C 4 3.5 3 2.5 *NOTE* Exceeding any of the limits of this section may lead to permanent damage to the device. Furthermore, extended operation at these maximum ratings may reduce the life of this device. Page 2 2 6.00 3.00 0.00 -3.00 -9.00 -6.00 Output Power (dBm) -12.00 -15.00 -18.00 -21.00 Figure 5: Current Consumption vs. Output Power (50% Duty Cycle) Page 3 PIN ASSIGNMENTS MODULE DESCRIPTION 1 2 3 4 GND PDN DATA VCC GND GND LADJ/VCC ANT 8 7 6 5 Figure 5: LR Series Transmitter Pinout (Top View) PIN DESCRIPTIONS Pin # 1 2 3 The LR transmitter is a low-cost, high-performance synthesized ASK / OOK transmitter, capable of sending serial data at up to 10,000bps. Because the transmitter is completely self-contained, requiring an antenna as the only additional RF component, application is extremely straightforward and assembly and testing costs are reduced. When combined with an LR Series receiver, a reliable serial link is formed capable of transferring data over line-of-site distances of up to 3,000 feet. The LR is housed in a compact surface-mount package that integrates easily into existing designs and is equally friendly to prototyping and volume production. The module’s low power consumption makes it ideal for battery-powered products. The transmitter is compatible with many other Linx receiver products, including the LC, LR, KH, and OEM product families. For applications where range is critical, the LR receiver is the best choice due to its outstanding sensitivity. LR Series modules are capable of meeting the regulatory requirements of domestic and international applications. THEORY OF OPERATION Description Analog Ground Digital Data Input Analog Ground DATA PDN Name GND DATA GND 4 LADJ/VCC Level Adjust. This line can be used to adjust the output power level of the transmitter. Connecting to VCC will give the highest output, while placing a resistor to VCC will lower the output level (see Figure 4 on Page 3). 50-ohm RF Output PLL VCO PA RF OUT XTAL Figure 6: LR Series Transmitter Block Diagram 5 6 7 ANT GND VCC Analog Ground Supply Voltage Power Down. Pulling this line low will place the transmitter into a low-current state. The module will not be able to transmit a signal in this state. The LR Series transmitter is designed to generate 1mW of output power into a 50-ohm single-ended antenna while suppressing harmonics and spurious emissions to within legal limits. The transmitter is comprised of a VCO locked by a frequency synthesizer that is referenced to a high precision crystal. The output of the VCO is amplified and buffered by an internal power amplifier. The amplifier is switched by the incoming data to produce a modulated carrier. The carrier is filtered to attenuate harmonics and then output to free space via the 50-ohm antenna port. The synthesized topology makes the module highly immune to the effects of antenna port loading and mismatch. This reduces or eliminates frequency pulling, bit contraction, and other negative effects common to low-cost transmitter architectures. It also allows for reliable performance over a wide operating temperature range. Like its companion LR Series receiver, the LR Series transmitter delivers a significantly higher level of performance and reliability than the LC Series or other SAW-based devices, yet remains very small and cost-effective. Page 5 8 PDN *CAUTION* This product incorporates numerous static-sensitive components. Always wear an ESD wrist strap and observe proper ESD handling procedures when working with this device. Failure to observe this precaution may result in module damage or failure. Page 4 THE DATA INPUT The CMOS-compatible data input on Pin 2 is normally supplied with a serial bit stream from a microprocessor or encoder, but it can also be used with standard UARTs. When a logic ‘1’ is present on the DATA line and the PDN line is high, then the Power Amplifier (PA) will be activated and the carrier frequency will be sent to the antenna port. When a logic ‘0’ is present on the DATA line or the PDN line is low, the PA is deactivated and the carrier is fully suppressed. The DATA line should always be driven with a voltage that is common to the supply voltage present on Pin 7 (VCC). The DATA line should never be allowed to exceed the supply voltage, as permanent damage to the module could occur. POWER SUPPLY REQUIREMENTS The module does not have an internal voltage regulator; therefore it requires a clean, well-regulated power source. While it is preferable to power the unit from a battery, it can also be operated from a power supply as long as noise is less than 20mV. Power supply noise can affect the transmitter modulation; therefore, providing a clean Vcc TO MODULE power supply for the module should be a high priority during design. 10Ω + USING THE PDN PIN The transmitter’s Power Down (PDN) line can be used to power down the transmitter without the need for an external switch. It allows easy control of the transmitter’s state from external components, such as a microcontroller. By periodically activating the transmitter, sending data, then powering down, the transmitter’s average current consumption can be greatly reduced, saving power in battery operated applications. The PDN line does not have an internal pull-up, so it will need to be pulled high or tied directly to VCC to turn on the transmitter. The pull-up should be a minimum of 30μA (10kΩ or less). When the PDN line is pulled to ground, the transmitter will enter into a low-current (