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TXM-418-LC Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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TXM-418-LC Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 11 page Page 5 Page 4 PIN ASSIGNMENTS GND DATA GND GND ANT LADJ/GND GND VCC 1 2 3 4 5 6 7 8 Figure 8: LC Series Transmitter Pinout (Top View) Pin # Name Description 1 GND Analog Ground 2 DATA Digital Data Input 3 GND Analog Ground 4 LADJ/GND Level Adjust. This line can be used to adjust the output power level of the transmitter. Connecting to ground will give the highest output, while placing a resistor to ground will lower the output level (see Figure 7 on Page 3). 5 ANT 50-ohm RF Output 6 GND Analog Ground 7 VCC Supply Voltage 6 GND Analog Ground PIN DESCRIPTIONS MODULE DESCRIPTION The LC Series transmitter is a low-cost, high-performance Surface Acoustic Wave (SAW) based Carrier-Present Carrier-Absent (CPCA) transmitter capable of sending serial data at up to 5,000bps. The LC’s compact surface-mount package integrates easily into existing designs and is equally friendly to prototype and volume production. The LC’s ultra-low power consumption makes it ideally suited for battery-powered products. When combined with a Linx LC or LR Series receiver, a reliable RF link is formed, capable of transferring data over line-of-sight distances in excess of 300 feet (with the LC Series receiver) or up to 3,000 feet (with the LR Series receiver). THEORY OF OPERATION The LC Series transmitter transmits data using Carrier-Present Carrier-Absent (CPCA) modulation. This type of AM modulation is often referred to by other designations, including Continuous Wave (CW) and On-Off Key (OOK). This type of modulation represents a logic low ‘0’ by the absence of a carrier and a logic high ‘1’ by the presence of a carrier. This method affords numerous benefits. Three of the most important are: 1) Cost-effectiveness due to design simplicity. 2) No minimum data rate or mark / space ratio requirement. 3) Higher output power and thus greater range in countries (such as the U.S.) where output power measurements are averaged over time. (Please refer to Linx Application Note AN-00130). The LC Series transmitter is based on a simple but highly optimized architecture that achieves a high fundamental output power with low harmonic content. This ensures that approval requirements can be met without external filter components. The LC Series transmitter is exceptionally stable over time, temperature, and physical shock as a result of the precision Surface Acoustic Wave (SAW) frequency reference. Due to the accuracy of the SAW device, most of the output power is concentrated in a narrow bandwidth. This allows the receiver’s bandwidth to be quite narrow, thus increasing sensitivity and reducing susceptibility to near-band interference. The quality of components and overall architecture utilized in the LC Series is extraordinary in a low-cost RF device and is one reason the LC transmitter is able to outperform more expensive products. Output Isolation & Filter RF Amplifier Keyed Output Vcc SAW Oscillator Data In 300-5,000bps 50 Ω RF OUT (ANT) Figure 9: LC Series Transmitter Block Diagram |
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