The LMX2531 is a low-power, high-performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and adjustable. Ultra-low noise and high-precision LDOs are integrated for the PLL and VCO, which yield higher supply-noise immunity and more consistent performance. When combined with a high-quality reference oscillator, the LMX2531 device generates very stable, low-noise local-oscillator signals for up and down conversion in wireless communication devices. The LMX2531 device is a monolithic integrated circuit, fabricated in an advanced BiCMOS process. Several different versions of this product accommodate different frequency bands.
| Output frequency (Min) (MHz) |
| Output frequency (Max) (MHz) |
| Normalized PLL phase noise (dBc/Hz) |
| 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) |
| Current consumption (mA) |
| VCC (V) |
| Integrated VCO |
| LMX2531 |
|---|
| 553 |
| 3132 |
| -212 |
| -104 |
| 34 |
| 2.8 to 3.2 |
| Yes |
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