Gehäuseinformationen
| Gehäuse | Pins WQFN (NJK) | 36 |
| Betriebstemperaturbereich (°C) -40 to 85 |
| Gehäusemenge | Träger 250 | SMALL T&R |
Merkmale von LMX2541
- Multiple Frequency Options Available
(See Device Comparison Table) - Frequencies from 31.6 MHz to 4000 MHz
- Very Low RMS Noise and Spurs
- –225 dBc/Hz Normalized PLL Phase Noise
- Integrated RMS Noise (100 Hz – 20 MHz)
- 2 mRad (100 Hz – 20 MHz) at 2.1 GHz
- 3.5 mRad (100 Hz - 20 MHz) at 3.5 GHz
- Ultra Low-Noise Integrated VCO
- External VCO Option (Internal VCO Bypassed)
- VCO Frequency Divider 1 to 63 (all values)
- Programmable Output Power
- Up to 104-MHz Phase Detector Frequency
- Integrated Low-Noise LDOs
- Programmable Charge Pump Output
- Partially Integrated Loop Filter
- Digital Frequency Shift Keying (FSK) Modulation Pin
- Integrated Reference Crystal Oscillator Circuit
- Hardware and Software Power Down
- FastLock Mode and VCO-Based Cycle Slip Reduction
- Analog and Digital Lock Detect
- 1.6-V Logic Compatibility
Beschreibung von LMX2541
The LMX2541 is an ultra low-noise frequency synthesizer which integrates a high performance delta-sigma fractional N PLL, a VCO with fully integrated tank circuit, and an optional frequency divider. The PLL offers an unprecedented normalized noise floor of -225 dBc/Hz and can be operated with up to 104 MHz of phase-detector rate (comparison frequency) in both integer and fractional modes. The PLL can also be configured to work with an external VCO.
The LMX2541 integrates several low-noise, high precision LDOs and output driver matching network to provide higher supply noise immunity and more consistent performance, while reducing the number of external components. When combined with a high quality reference oscillator, the LMX2541 generates a very stable, ultra low-noise signal.
The LMX2541 is offered in a family of 6 devices with varying VCO frequency range from 1990 MHz up to 4 GHz. Using a flexible divider, the LMX2541 can generate frequencies as low as 31.6 MHz.
The LMX2541 is a monolithic integrated circuit, fabricated in a proprietary BiCMOS process. Device programming is facilitated using a three-wire MICROWIRE interface that can operate down to 1.6 volts. Supply voltage ranges from 3.15 V to 3.45 V. The LMX2541 is available in a 36-pin 6-mm × 6-mm × 0.8-mm WQFN Package.