LMX2531LQE2820E/NOPB

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The LMX2531LQE2820E/NOPB offers a low-phase noise, flexible, high-performance,integer-N frequency synthesizer with a wide-band, low-noise digital PLL suitable for Applications including cellular infrastructure, test and measurement, satellite communications, and software-defined radio systems. This device provides integrated, low-noise synthesizer, voltage-controlled oscillator (VCO), and loop filter components, vastly simplifying design and potentially reducing design time, board space, and cost. The device uses a high-performance, simple-to-program, integrated digital PLL core along with an integrated loop filter capable of operating from 12.5 GHz to 16.5 GHz. Only seven external components are required to complete the PLL circuit up to 16.5 GHz. Swapped-VCO architecture and advanced wideband noise cancellation technology provide low-phase noise and excellent spurious rejection.

The LMX2531LQE2820E/NOPB includes two charge pumps, two frequency dividers, a divide-by-2 programmable output prescaler, four filter clock select pins, integrated loop filter and control logic. A selectable reference frequency division block is included with optional 26, 28, and 30 division ratios, allowing four different frequency references to be used. The high-performance digital PLL core supports user-programmable up/down ratio, loop bandwidth, and carrier frequency and can lock to an external reference as low as 100 kHz (50 kHz/div) and as high as 350 MHz (175 MHz/div).

The integrated VCO operates at up to 16.5 GHz and within the temperature range of -40 to +85 °C. It exhibits an output power at Pin 5 that is between -5 and -8 dBm. The reference clock has a frequency range of 1.2 to 350 MHz while the loop filter has a range of 3.2 to 40 kHz. The device comes in a tiny 4 mm X 4 mm QFN 28, RoHS compliant package and is pre-programmed for immediate use.

The LMX2531LQE2820E/NOPB provides a combination of low-phase noise flexibility and high-performance that makes it ideal for use in applications such as cellular infrastructure, test and measurement, satellite communications, and software-defined radio systems. As an integer-N frequency synthesizer, it does not require complicated calibration and provides considerable design flexibility. The output frequency range is possible through external frequency dividers and the loop filter is optimized on-chip for maximum system performance.

In summary, the LMX2531LQE2820E/NOPB is a high-performance, low-phase noise,integer-N frequency synthesizer with a wide-band, low-noise digital PLL suitable for a variety of applications. The device features integrated loop filter and control logic, allowing it to be easily integrated into a system. It is available in a 4 mm X 4 mm QFN 28, RoHS compliant package and is pre-programmed for immediate use. It is ideal for use in applications such as cellular infrastructure, test and measurement, satellite communications, and software-defined radio systems.

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