Semiconductor Solutions for a wide range of Applications, from Networking & Communications and Consumer Electronics like Smartphones, Digital Camera, HDTV and Devices like Netbooks and Set Top Box. They also manufacture High Rel Discrete Semiconductors.
Semtech Corporation - Analog and Mixed Signal
The Communication Chips are used in Wireless LAN Modems, Satellite Communication, Cellular Infrastructure, Optical Transport and Datacenters.
The SX1243 is an ultra-low-cost, fully integrated FSK or OOK transmitter suitable for operation between 310 and 450 MHz, 860 and 870 MHz, as well as 902 and 928 MHz.
It contains a frequency synthesizer which is a fractional-N sigma-delta PLL. For frequency modulation (FSK), the modulation is made inside the PLL bandwidth. For amplitude modulation (OOK), the modulation is performed by turning on and off the output PA.
The frequency reference used by the PLL is generated by a 22, 24 or 26 MHz crystal oscillator, depending on the frequency band of interest.
The Power Amplifier (PA), connected to the RFOUT pin, can deliver 0 dBm or +10 dBm in a 50 Ω load. Each of these two output powers need a specific matching network when efficiency needs to be optimized.
Semtech SX1243 - Low cost, low current +10dBm RF Transmitter, 310-928MHz
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