Dual-band PLL with bypass for RF and IF synthesis
The Texas Instruments LMX2331UTM is a PLLatinum PLL frequency synthesizer with a bypass mode, delivering two independent frequency synthesis paths: one reaching 2 GHz and the other 600 MHz. This dual-band architecture suits RF front-end designs where a single IC generates both the main local oscillator and the intermediate frequency reference.
Supply, temperature, and interface flexibility
Input logic accepts both CMOS and TTL levels, while the output is CMOS, so it interfaces directly with standard baseband processors or FPGAs without external level translation. The 3:1 input-to-output ratio and differential input with single-ended output give the system architect flexibility in reference routing and noise rejection.
Package and board-fit for RF layouts
Housed in a 20-TSSOP with a 0.173-inch (4.40 mm) body width, the LMX2331UTM fits tight RF sections where trace length to the VCO and loop filter must be minimised. The surface-mount package suits standard reflow assembly, though note the RoHS non-compliant status — the tin-lead finish is intentional for high-reliability solder joints in aerospace or defence assemblies where lead-free whisker risk is unacceptable.