RXM-315-LR_1

RXM-315-LR RXM-418-LR RXM-433-LR WIRELESS MADE SIMPLE ® LR SERIES RECEIVER MODULE DATA GUIDE DESCRIPTION The LR Receiver is ideal for the wireless transfer of 0.812" serial data, control, or command information in the favorable 260-470MHz band. The receiver’s advanced synthesized architecture achieves an outstanding typical sensitivity of -112dBm, which 0.630" RF MODULE RXM-418-LR-S provides a 5 to 10 times improvement in range over LOT 10000 previous solutions. When paired with a compatible Linx transmitter, 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. 0.125" Applications operating over shorter distances or at lower data rates will also benefit from increased link reliability and superior noise immunity. Housed in a Figure 1: Package Dimensions tiny reflow-compatible SMD package, the LR Receiver module is footprint-compatible with the popular LC-S Receiver, allowing existing users an instant path to improved range and lower cost. No external components are required (except an antenna), allowing for easy integration, even for engineers without previous RF experience. FEATURES Long range Low cost PLL-synthesized architecture Direct serial interface Data rates to 10,000bps Qualified data output No external components needed Low power consumption Wide supply range (2.7 to 5.2VDC) Compact surface-mount package Wide temperature range RSSI and Power-down functions 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 Receivers are supplied in tubes of 25 pcs. Revised 1/25/08 ELECTRICAL SPECIFICATIONS Parameter POWER SUPPLY Operating Voltage With Dropping Resistor Supply Current Power-Down Current RECEIVER SECTION Receive Frequency Range: RXM-315-LR RXM-418-LR RXM-433-LR Center Frequency Accuracy LO Feedthrough IF Frequency Noise Bandwidth Data Rate Data Output: Logic Low Logic High Power-Down Input: Logic Low Logic High Receiver Sensitivity RSSI / Analog: Dynamic Range Analog Bandwidth Gain Voltage With No Carrier ANTENNA PORT RF Input Impedance TIMING Receiver Turn-On Time: Via VCC Via PDN Max. Time Between Transitions ENVIRONMENTAL Operating Temperature Range Designation VCC ICC IPDN FC – – – -50 – – – 100 – – – VCC-0.4 -106 – 50 – – – 315 418 433.92 – -80 10.7 280 – 0.0 3.0 – – -112 80 – 16 1.5 50 – – – +50 – – – 10,000 – – 0.4 – -118 – 5,000 – – – MHz MHz MHz kHz dBm MHz kHz bps VDC VDC VDC VDC dBm dB Hz mV / dB V Ω – – – – 2,5 5 – – 3 3 – – 4 5 5 5 5 5 Min. 2.7 4.3 4.0 20.0 Typical 3.0 5.0 5.2 28.0 Max. 3.6 5.2 7.0 35.0 Units VDC VDC mA µA Notes – 1,5 – 5 ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC Supply Voltage VCC, Using Resistor Any Input or Output Pin RF Input Operating Temperature Storage Temperature Soldering Temperature -0.3 -0.3 -0.3 to +3.6 to +5.2 to +3.6 0 -40 to +70 -45 to +85 +225°C for 10 seconds VDC VDC VDC dBm °C °C *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. – – FIF N3DB – VOL VOH VIL VIH – – – – – RIN 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. The pins marked NC have no electrical connection. 5VDC 330Ω External Resistor 3VDC 1 2 3 4 5 6 7 8 NC NC NC GND VCC PDN RSSI DATA ANT GND NC NC NC NC NC NC 16 15 14 13 12 11 10 9 Figure 2: Test / Basic Application Circuit TYPICAL PERFORMANCE GRAPHS Supply RX Data PDN RX DATA – – – – 3.0 0.04 – -40 7.0 0.25 10.0 – 10.0 0.50 – +70 mSec mSec mSec 5,6 5,6 5 5 °C Table 1: LR Series Receiver Specifications Notes 1. The LR can utilize a 4.3 to 5.2VDC supply provided a 330-ohm resistor is placed in series with VCC. 2. Into a 50-ohm load. 3. When operating from a 5V source, it is important to consider that the output will swing to well less than 5 volts as a result of the required dropping resistor. Please verify that the minimum voltage will meet the high threshold requirement of the device to which data is being sent. 4. For BER of 10-5 at 1,200bps. 5. Characterized, but not tested. 6. Time to valid data output. Figure 3: Turn-On Time from VCC 5.40 Figure 4: Turn-On Time from PDN 5.35 RFIN >-35dBm NO RFIN Supply Current (mA) 5.30 5.25 With Dropping Resistor 5.20 *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 2 5.15 5.10 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 Supply Voltage (VDC) Figure 5: Consumption vs. Supply Figure 6: RSSI Response Time Page 3 PIN ASSIGNMENTS 1 2 3 4 5 6 7 8 NC NC NC GND VCC PDN RSSI DATA ANT GND NC NC NC NC NC NC 16 15 14 13 12 11 10 9 MODULE DESCRIPTION The LR receiver is a low-cost, high-performance synthesized AM / OOK receiver, capable of receiving serial data at up to 10,000bps. Its exceptional sensitivity results in outstanding range performance. The LR’s compact surface-mount package is friendly to automated or hand production. LR Series modules are capable of meeting the regulatory requirements of many domestic and international applications. 50Ω RF IN (Antenna) Band Select Filter LNA 90˚ 0˚ 10.7MHz IF Filter Data Slicer Limiter + RSSI/Analog Data Out ∑ VCO Figure 7: LR Series Receiver Pinout (Top View) PIN DESCRIPTIONS PLL Pin # 1 2 3 4 5 Name NC NC NC GND VCC Description No Connection No Connection No Connection Analog Ground Supply Voltage Power Down. Pulling this line low will place the receiver into a low-current state. The module will not be able to receive a signal in this state. Received Signal Strength Indicator. This line will supply an analog voltage that is proportional to the strength of the received signal. Digital Data Output. This line will output the demodulated digital data. No Connection No Connection No Connection No Connection No Connection No Connection Analog Ground 50-ohm RF Input XTAL Figure 8: LR Series Receiver Block Diagram THEORY OF OPERATION The LR receiver is designed to recover data sent by an AM or Carrier-Present Carrier-Absent (CPCA) transmitter, also Data Data referred to as CW or On-Off Keying (OOK). This type of modulation Carrier represents a logic low ‘0’ by the absence of a carrier and a logic high ‘1’ by the presence of a carrier. This modulation method affords numerous benefits. The Figure 9: CPCA (AM) Modulation two most important are: 1) cost-effectiveness due to design simplicity and 2) higher allowable output power and thus greater range in countries (such as the U.S.) that average output power measurements over time. Please refer to Linx Application Note AN-00130 for a further discussion of modulation techniques. The LR receiver utilizes an advanced single-conversion superheterodyne architecture. Transmitted signals enter the module through a 50-ohm RF port intended for single-ended connection to an external antenna. RF signals entering the antenna are filtered and then amplified by an NMOS cascode Low Noise Amplifier (LNA). The filtered, amplified signal is then down-converted to a 10.7MHz Intermediate Frequency (IF) by mixing it with a low-side Local Oscillator (LO). The LO frequency is generated by a Voltage Controlled Oscillator (VCO) locked by a Phase-Locked Loop (PLL) frequency synthesizer that utilizes a precision crystal reference. The mixer stage incorporates a pair of double-balanced mixers and a unique image rejection circuit. This circuit, along with the high IF frequency and ceramic IF filters, reduces susceptibility to interference. The IF frequency is further amplified, filtered, and demodulated to recover the baseband signal originally transmitted. The baseband signal is squared by a data slicer and output to the DATA pin. The architecture and quality of the components utilized in the LR module enable it to outperform many far more expensive receiver products. Page 5 6 PDN 7 RSSI 8 9 10 11 12 13 14 15 16 Page 4 DATA NC NC NC NC NC NC GND RF IN 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 significantly affect the receiver sensitivity, therefore; providing clean power to the module should be a high priority during design. Vcc TO A 10Ω resistor in series with the supply followed by a 10µF tantalum capacitor from VCC to ground will help in cases where the quality of the supply power is poor. Operation from 4.3V to 5.2V requires an external 330Ω series resistor to prevent VCC from exceeding 3.6V. These values may need to be adjusted depending on the noise present on the supply line. MODULE 10Ω Vcc IN + THE DATA OUTPUT The CMOS-compatible data output is normally used to drive a digital decoder IC or a microprocessor that is performing the data decoding. In addition, the module can be connected to an RS-232 level converter chip, like the MAX232, to a Linx USB module for interfacing to a PC, or to a standard UART. Since a UART uses high marking to indicate the absence of data, a designer using a UART may wish to insert a logic inverter between the data output of the receiver and the UART. The receiver’s output may appear to switch randomly in the absence of a transmitter. This is a result of the receiver sensitivity being below the noise floor of the board. This noise can be handled in software by implementing a noisetolerant protocol as described in Application Note AN-00160. If a software solution is not appropriate, the squelch circuit in the figure below can be used and the designer can make a compromise between noise level and range. VCC R2 500k 10μF Figure 10: Supply Filter USING THE PDN PIN The Power Down (PDN) line can be used to power down the receiver without the need for an external switch. This line has an internal pull-up, so when it is held high or simply left floating, the module will be active. When the PDN line is pulled to ground, the receiver will enter into a low-current (