RF transmitter replaces SAW-based parts in remote control systems

Semtech Corp.'s SX1243 is a fully integrated, low cost FSK/OOK radio transmitter designed to replace a surface acoustic wave (SAW)-based resonator transmitters in garage door openers, remote keyless entry (RKE) and other consumer remote control systems.

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, according to Semtech. 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 suitable 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 11mA at +10dBm OOK or 15mA at +10dBm FSK making it well-suited for applications requiring coincell batteries, which only support peak currents up to 20mA. The low active and sleep currents, combined with fast wake-up times from sleep to TX, make it a good fit for applications requiring fast wake-up and long battery lifetime.

The SX1243 features Semtech's Power & Go technology that reduces cost 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.

Key highlights:

• +10 dBm or 0 dBm configurable output power
• Low current consumption

º  11mA TX current OOK mode

º  15mA TX current FSK mode

º  100nA sleep current

• Bit rates up to 100 kbps
• OOK and FSK modulation
• 1.8 to 3.7 V supply range
• Fractional-N PLL with 1.5 kHz typical step
• Frequency agility for FHSS modulation
• FCC Part 15.247 DTS mode compliant
• DFN8 package

Pricing: $0.55 each in 10,000-piece lots.

Availability: Immediately in production quantities.

Datasheet: Click here.