Cart Industry's Lowest Phase Noise Frequency Synthesizer
TI's new LMX2581 wideband frequency synthesizer with integrated VCO outputs delivers the industry's best phase noise performance. The LMX2581's low noise PLL and industry's highest phase detector frequency outperforms the competition to achieve the flexibility of a wideband frequency synthesizer without compromising system performance.
The highly-integrated LMX2581 combines a ΔΣ fractional-N PLL, a multi-core VCO with tank circuit, optional frequency divider, two differential RF output buffers that can deliver +10 dBm single-ended on each side, and several low-noise, high-precision LDOs to enable lower cost systems in a number of applications, including wireless infrastructure, defense and aerospace, radar, test and measurement, and medical imaging.
Key Features
- Generates any frequency from 50 MHz to 3.76 GHz
- High performance PLL improves RF sensitivity
- -229 dBc/Hz normalized PLL phase noise
- -120.8 dBc/Hz normalized PLL 1/f noise
- 200 MHz phase detector frequency
- Integer and fractional PLL modes: multi-order ΔΣ with optional dithering for spur reduction
- Broadband multi-core VCO tuning range from 1880 to 3760 MHz
- Dual differential outputs, programmable from -4 to +10 dBm
- Option to bypass internal VCO to support an external VCO
Design Resources
Featured Frequency Synthesizers
| LMX2581 | LMX2541 | LMX2531 | |
|---|---|---|---|
| Frequency Range (MHz) | 50 to 3760 | 32 to 4000 | 553 to 3132 |
| Number of Outputs | 2 | 1 | 1 |
| Output Format | Differential | Single-Ended | Single-Ended |
| VCO Integration | Internal/External | Internal/External | Internal |
| In-Band Spur (dBc) | -46 | -40 | -35 |
| PLL Normalized Phase Noise (dBc/Hz) | -229 | -225.4 | -212 |
| PLL Normalized 1/f Noise (dBc/Hz) | -119 | -124.5 | -104 |
| Max Phase Detector Frequency (MHz) | 200 | 104 | 32 |
| Samples & Buy | Samples & Buy | Samples & Buy |
Wireless Infrastructure System Diagram
Videos