Dual-band frequency synthesizer for RF downconversion
The Texas Instruments LMX2430TM/NOPB is a PLLatinum™ PLL frequency synthesizer designed for dual-band RF and IF synthesis. It delivers a maximum RF output of 3 GHz and an IF output of 800 MHz, making it a fit for satellite LNB downconverters, 5G small-cell local oscillators, and point-to-point microwave radios where a single-chip PLL replaces a discrete VCO-plus-divider chain. The device operates from a 2.25 V to 2.75 V supply rail. The 3:2 input-to-output ratio and differential input with single-ended CMOS output suit designs that need to buffer a reference clock into separate RF and IF paths without external level shifters. Rated for -40°C to 85°C operation, the LMX2430TM/NOPB is suited for outdoor telecom enclosures and factory-floor RF modules where ambient temperature swings are routine. The 20-TSSOP package keeps the board footprint small enough for multi-channel RF cards.
Supply rail and frequency planning
The 2.25 V to 2.75 V supply range is the critical BOM constraint. The dual-band architecture means one device covers both the RF local oscillator (up to 3 GHz) and the IF local oscillator (up to 800 MHz), saving a second PLL IC and its associated loop-filter components. The PLL includes a bypass mode, which lets the VCO run open-loop for test or calibration sequences. The CMOS I/O simplifies interfacing to a baseband processor or FPGA — no external translation needed for the serial control lines.
Lifecycle and sourcing posture
The LMX2430TM/NOPB carries an active lifecycle status — no last-time-buy notice, no NRND flag. It remains a valid BOM line for both new designs and production replenishment.