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Home arrow How To arrow RF arrow RF transmitter eyes wireless security, home automation applications
RF transmitter eyes wireless security, home automation applications PDF Print E-mail
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RF transmitter eyes wireless security, home automation applications


Semtech Corp., a supplier of analog and mixed-signal semiconductors for communications, portable devices, computers, and industrial equipment, has developed a single-chip, ultra-high frequency transmitter for wireless security and home automation applications. Supporting three frequencies and eight power output levels, the highly integrated SX1223 is optimized for design reuse with programmable channel, bit rate, frequency deviation and output power. It is well suited for both cost-reducing legacy products and next-generation designs. The device operates on the 434 MHz, 869 MHz or 915 MHz license-free ISM (industry, scientific and medical) frequency bands. It supports data rates of between 1.2 kbps and 153.6 kbps. At the lowest data rate, the device is suited for home appliance control applications such as garage door opener or home environmental remote controls. At higher speeds it can be used where more data need to be transmitted such as in a wireless security camera that sends a video frame to a base station.

The device features an eight-step programmable power amplifier with a signal power range of �11 dBm to 10 dBm, allowing product developers to maximize battery life by customizing the power output for short-range indoor use or long-range outdoor applications.

The device comes in a 4 mm x 4 mm TQFN24 package and is highly integrated, which reduces the need for external components and results in a lower total system cost. ETSI and FCC regulations are satisfied without any need for a SAW filter.

The high-efficiency SX1223 typically consumes only 25.8 mA at 10 dBm in transmitter mode and has a quiescent power draw of 300 nA. The device has four operation modes (sleep, standby, synthesizer running and transmit) to further prolong battery life. A fast start-up mode wakes the device from sleep mode in less than 150 us, further saving battery life by shortening the time between being enabled and transmitting data.

The SX1223 is the first transmitter-only product to join Semtech's wireless product line and is fully compatible with the company's XE1203F and XE1205 transceivers. These devices are two of the industry's most sensitive ISM-band transceivers and, when combined with the SX1223, provide a reliable and cost-effective solution for unidirectional wireless systems.

The SX1223 is available immediately in production quantities and is priced at $1.45 each in 10,000-piece lots.


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