Transmitters enables true data-in/RF-out capability
The SX1240 and SX1242 ISM-band RF transmitters give designers a fully integrated solution, to enable true data-in/RF-out capability, with only an external crystal and antenna-impedance-matching network needed. The transmitters simplify design, reduce system size, and lower costs by integrating “power-and-go modes,” which are preset for 434 and 868 MHz (SX1240) or 345 MHz (SX1242), eliminating the need for a MCU.
The SX1240 transmitter operates in the 418-, 434-, and 868-MHz license-free ISM bands and works with FSK and OOK modulation formats up to 100 kbits/s. Features include a current consumption of 16.5 mA typ at 10-dBm output power and a sleep mode current of 500 nA typ.
In “power-and-go” mode, the transmitter can be preconfigured as either a 434-MHz OOK transmitter or an 868 MHz FSK transmitter, without the need for an MCU, by simply setting the control pin. In “advanced” mode, the SX1240 can be used with an MCU and programmed via a two-wire interface for designs requiring custom configuration of output power, modulation format, operating channel, and other communication parameters.
The SX1242 transmitter offers similar features to the SX1240, but operates in the 345-MHz ISM band and works with OOK modulation formats up to 10 kbits/s. The SX1242 also offers both “power-and-go” mode (preconfigured to operate without a microcontroller at 345 MHz) and “advanced” mode. It features a current consumption of 22 mA typ at 12-dBm output power and a sleep mode current of 500 nA typ. Both are housed in 8-pin SOIC packaging. ($0.58 ea/2,500 — available now.)
By Christina Nickolas
Semtech , Camarillo , CA
Sales 805-498-2111
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