RXM-869-ES

TXM-869-ES TXM-916-ES WIRELESS MADE SIMPLE ® ES SERIES TRANSMITTER DATA GUIDE DESCRIPTION Housed in a tiny SMD package, the ES Series offers 0.510" an unmatched combination of features, performance, and cost-effectiveness. The ES utilizes an advanced FM / FSK-based synthesized architecture to provide superior performance and noise immunity when compared to AM / OOK solutions. An outstanding 0.630" RF MODULE TXM-916-ES 56kbps maximum data rate and wide-range analog LOT 1000 capability make the ES Series equally at home with digital data or analog sources. A host of useful features including PDN, LADJ, low voltage detect, and a clock source are provided. The ES operates in the 0.125" 900MHz band, which in North America allows an unlimited variety of applications, including data links, audio links, home and industrial automation, security, Figure 1: Package Dimensions remote control / command, and monitoring. Like all Linx modules, the ES Series requires no tuning or external RF components (except an antenna). FEATURES Ultra-compact SMD package FM / FSK modulation Wide bandwidth (20Hz to 28kHz) Very low current consumption Data rates to 56,000bps User power-down input Low-voltage detect output Microprocessor clock output No production tuning No external RF components needed Precision-frequency synthesized architecture Direct interface to analog and digital sources Excellent cost / performance ratio APPLICATIONS INCLUDE Wireless Data Transfer Wireless Analog / Audio Home / Industrial Automation Keyless Entry Remote Control Fire / Security Alarms Wireless Networks Remote Status Sensing / Telemetry Long-Range RFID RS-232 / 485 Data Links Voice / Music Links / Intercom ORDERING INFORMATION PART # DESCRIPTION TXM-869-ES ES Series Transmitter 869MHz TXM-916-ES ES Series Transmitter 916MHz RXM-869-ES ES Series Receiver 869MHz RXM-916-ES ES Series Receiver 916MHz EVAL-***-ES Basic Evaluation Kit MDEV-***-ES Master Development System *** = Frequency Receivers are supplied in tubes of 40 pcs. Revised 1/28/08 ELECTRICAL SPECIFICATIONS Parameter POWER SUPPLY Operating Voltage Supply Current Power-Down Current TRANSMIT SECTION Transmit Frequency: TXM-916-ES TXM-869-ES Center Frequency Accuracy Output Power Output Power Control Range Harmonic Emissions Frequency Deviation TXM-916-ES TXM-869-ES Data Rate Analog/Audio Bandwidth Data Input: Logic Low Logic High Power-Down Input: Logic Low Logic High Analog Input ANTENNA PORT RF Output Impedance TIMING Transmitter Turn-On Time Max. Time Between Transitions ENVIRONMENTAL Operating Temperature Range – 0 – +70 – – 0.1 – 0.5 – 1.5 5.0 mSec mSec 7,10 7,11 7 ROUT – 50 – Ω 7 – – – 0.0 1.5 0.0 – – – 0.7 VCC 5.0 VDC VDC VP-P – – 9 VIL VIH 0.0 3.0 – – 0.4 5.2 VDC VDC 8 8 – – – – 90 – 200 20 110 75 – – 130 130 56,000 28,000 kHz kHz bps Hz 5 5 7 6,7 – PO – PH FC – – -60 -4 – – 916.48 869.85 – 0 65 -55 – – +60 +4 – -47 MHz MHz kHz dBm dB dBc 4 4 1 2,3 2,3,7 2 VCC ICC IPDN 2.1 5.5 – 3.0 7.0 90.0 4.0 8.5 – VDC mA µA – – 7 Designation Min. Typical Max. Units Notes ABSOLUTE MAXIMUM RATINGS Supply voltage VCC Any Input or Output Pin Operating Temperature Storage Temperature Soldering Temperature -0.3 -0.5 0 -40 +216°C to +4.0 to VCC + 0.5 to +70 to +90 for 15 seconds VDC VDC °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. 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. 1 2 3 4 5 PDN ANT GND LADJ VCC LO_V_D GND /CLK SE DATA /CLK 10 9 8 7 6 Figure 2: Test / Basic Application Circuit TYPICAL PERFORMANCE GRAPHS 40 LADJ to GND (kΩ) 35 30 1 IN 25 20 15 -10 -8.0 -6.0 -4.0 -2.0 -1.0 RF Output Attenuation (dB) -0.4 -0.2 2 CH1 1.66V CH2 100mV 250uS OUT °C Table 1: ES Series Transmitter Specifications Notes 1. Center frequency measured while modulated with a 0-5V square wave. 2. Into a 50-ohm load. 3. LADJ open. 4. Maximum power when LADJ open, minimum power when LADJ grounded. 5. DATA pin modulated with a 0-5V square wave. 6. The audio bandwidth is wide to accommodate the needs of the data slicer. 7. Characterized, but not tested. 8. The ES is optimized for both 0-5V and 0-3V modulation when sending digital data. 9. Analog signals, including audio, should be AC-coupled. 10. Time to transmitter readiness from the application of power to VCC or PDN going high. 11. Maximum time without a data transition. Figure 3: Level Adjust Attenuation Figure 4: Square-Wave Modulation Linearity Tx VCC/PDN Tx VCC/PDN 1 1 *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 RX Data Rx Demodulated Analog Data 2 2 CH1 2.00V CH2 2.00V 1mS CH1 2.00V CH2 500mV 100uS Figure 5: Tx Powerup to Valid Rx Analog Figure 6: Tx Powerup to Valid Rx Data Page 3 PIN ASSIGNMENTS MODULE DESCRIPTION The TXM-***-ES module is a single-channel transmitter designed for the wireless transfer of digital or analog information over distances of up to 1,000 feet outdoors and up to 500 feet indoors. It is based on a high-performance synthesized architecture. FM / FSK modulation is utilized to provide superior performance and noise immunity over AM-based solutions. The ES Series is incredibly compact and cost-effective when compared with other FM / FSK devices. Best of all, it is packed with many useful features and capabilities that offer a great deal of application flexibility to the designer. Some of these features, which will be discussed in depth in this data guide, are: /CLK Output (use for an external micro-controller) LO_V_DET (low-voltage detection) LADJ (adjust the RF output power) The ES Series is offered in the 902-928MHz band, which is free from the legal restrictions of the lower 260-470MHz band. This gives the designer much more freedom in the types of applications that can be designed. The 869.85MHz version allows for the same freedom of design in European applications. RF Amplifier Precision Crystal Data In PLL Frequency Synthesizer LC Filter Antenna Port 1 2 3 4 5 PDN ANT LADJ GND VCC LO_V_D GND /CLK SE DATA /CLK 10 9 8 7 6 Figure 7: ES Series Transmitter Pinout (Top View) PIN DESCRIPTIONS Pin # 1 Name PDN Description 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. 2 LADJ 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 GND will lower the output level (see Figure 4 on Page 3). Supply Voltage Analog Ground Analog or Digital Data Input Divided Clock Output Clock Frequency Selection. Logic low selects divide by 256, logic high selects divide by 1,024. Low Voltage Detect. This line goes low when VCC is less than 2.15V. Analog Ground 50-ohm RF Output /CLK SEL Frequency Divider 256 / 1,024 /CLK Output 3 4 5 6 7 VCC GND DATA /CLK /CLK SEL Figure 8: ES Series Transmitter Block Diagram THEORY OF OPERATION The ES Series FM / FSK transmitter is capable of generating 1mW of output power into a 50-ohm load while suppressing harmonics and spurious emissions to within legal limits. The transmitter is comprised of a VCO and a crystalcontrolled frequency synthesizer. The frequency synthesizer, referenced to a precision crystal, locks the VCO to achieve a high-Q, low phase-noise oscillator. The transmitter operates by directly modulating the crystal with the baseband signal present on the DATA line. Pulling the crystal in this manner achieves the desired deviation and linearity. If the transmitter’s VCO were modulated, the frequency synthesizer would track out much of the deviation within the bandwidth of the loop filter (this is a common limitation of most synthesized FM transmitters). The carrier is then amplified and filtered before being output on the 50-ohm ANT line. The frequency of the Divided Clock output is determined by the state of the Clock Frequeny Selection line. A low on the Select line will generate a signal on the clock output that is the center frequency divided by 256, a high will be the center frequency divided by 1,024. 8 9 10 LO_V_D GND ANT Page 4 Page 5 USING THE DIVIDED CLOCK OUTPUT (/CLK) When the ES is used with a microcontroller, the divided clock output (/CLK) saves cost and space by eliminating the need for a crystal or other frequency reference for the microprocessor. This line is an open collector output, so an external pull-up resistor (RL) should be connected between this line and the positive supply voltage. The value of RL is calculated using two factors: 1) Determine the clock frequency (fCLKOUT). If /CLK SE is open, the /CLK output will be the Tx center frequency (in MHz) divided by 1,024; if /CLK SEL is grounded, it will be /256. 2) Determine the load capacitance of the PCB plus the microcontroller’s input capacitance (CLD in pF). Using these two factors, the value of RL can be easily calculated: “/256” RL = 1000/(fCLKOUT*8*CLD) Example: “/1024” RL = 1000/(fCLKOUT*8*CLD) Example: USING THE PDN PIN The Power Down (PDN) line can be used to power down the transmitter 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 transmitter will enter into a lowcurrent (