RF transmitter improves performance, reduces system cost while extending battery lifetime
The SX1243 features a fractional-N phase lock loop (PLL), which delivers higher performance and more flexibility, while minimizing the BOM cost versus traditional SAW-based resonator designs. The part covers the frequency bands from 310 MHz to 450 MHz, 860 MHz to 870 MHz, as well as 902 MHz to 928 MHz which makes it ideally suited for worldwide operation and regulatory compliance for FCC 15.231/15.247, ARIB and European products under EN 300-220.
To extend battery life, the SX1243 has very low active current consumption of 11 mA at +10 dBm OOK or 15 mA at +10 dBm FSK making it ideal for applications requiring coincell batteries, which only support peak currents up to 20 mA. The low active and sleep currents, combined with fast wake-up times from sleep to TX, make it a perfect fit for applications requiring fast wake-up and long battery lifetime.
The SX1243 features Semtech’s exclusive Power & Go technology that reduces cost dramatically by eliminating the need for a microcontroller (MCU) to configure the part. In Power & Go mode, the part will automatically wake-up for transmission once data transitions are detected on the data pin and automatically return to sleep once the transitions cease. Default configurations for Power & Go are preprogrammed and can be modified for high-volume applications. In other applications where more flexibility to configure parameters is desired, an interface for use with an external MCU is available.
While the SX1243 offers designers the benefit of board space savings, its small size and RoHS & WEEE compliance also contributes to energy conservation and hazardous waste reduction.
Availability and Pricing
The SX1243 is available immediately in production quantities and is priced at $0.55 each in 10,000-piece lots. Semtech offers comprehensive design assistance, including field- and factory-based support.
More information about the SX1243 FSK/OOK radio transmitter available at