Overview
The LMX2541SQ3740E/NOPB is an ultra-low noise PLLatinum frequency synthesizer produced by Texas Instruments. This device integrates a high-performance Phase-Locked Loop (PLL) with a fully integrated Voltage-Controlled Oscillator (VCO), a partially integrated loop filter, a VCO divider, and a programmable output buffer. It is designed to offer low noise and high frequency stability, making it suitable for a variety of applications requiring precise frequency synthesis.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Frequency Range | 55.2 MHz to 571.4 MHz | Continuous coverage |
| Package Type | 36-pin WQFN (NJK) | |
| Operating Temperature | -40°C to 85°C | |
| Supply Voltage | 3.15 V to 3.45 V | Typical at 3.3 V, 25°C |
| Phase Noise | -103 dBc/Hz at 1 kHz offset | At 3700 MHz output frequency, 100 MHz phase detector frequency |
| VCO Divider Range | 2 to 63, and bypass mode | In full chip mode |
| Output Power | Programmable using VCOGAIN, OUTTERM, and DIVGAIN |
Key Features
- Ultra-Low Noise: The LMX2541 features ultra-low phase noise performance, making it ideal for applications requiring high frequency stability and low noise.
- Integrated VCO: The device includes a fully integrated VCO, reducing the need for external components and simplifying the design process.
- Programmable Output Buffer: The output power at the RFout pin can be programmed to various levels, and the output buffer can be disabled while keeping the PLL in lock.
- Multiple Operating Modes: The device can be configured in Full Chip Mode, External VCO Mode, and Divider Only Mode, offering flexibility in different application scenarios.
- Fastlock Feature: The Fastlock feature improves lock times, and the Ftest/LD pin can be configured to output a signal indicating the PLL lock status.
- Power Management: The device supports powerdown modes, retaining programming and VCO calibration information when powered down.
Applications
- Wireless Communication Systems: Suitable for use in cellular base stations, wireless local area networks (WLAN), and other wireless communication systems.
- Test and Measurement Equipment: Ideal for use in signal generators, spectrum analyzers, and other test equipment requiring precise frequency synthesis.
- Radar Systems: Used in radar systems for frequency generation and synthesis.
- Medical Imaging and Diagnostic Equipment: Can be used in medical imaging and diagnostic equipment that require stable and low-noise frequency sources.
Q & A
- What is the frequency range of the LMX2541SQ3740E?
The LMX2541SQ3740E offers continuous frequency coverage from 55.2 MHz to 571.4 MHz.
- What package type does the LMX2541SQ3740E come in?
The device comes in a 36-pin WQFN (NJK) package.
- What are the operating temperature and supply voltage ranges for the LMX2541SQ3740E?
The operating temperature range is -40°C to 85°C, and the supply voltage range is 3.15 V to 3.45 V, with typical operation at 3.3 V and 25°C.
- How is the output power of the LMX2541SQ3740E controlled?
The output power at the RFout pin can be programmed using the VCOGAIN, OUTTERM, and DIVGAIN programming words.
- What are the different operating modes of the LMX2541SQ3740E?
The device can be configured in Full Chip Mode, External VCO Mode, and Divider Only Mode.
- Does the LMX2541SQ3740E support powerdown modes?
Yes, the device supports powerdown modes, and the programming and VCO calibration information are retained when powered down.
- How does the Fastlock feature work in the LMX2541SQ3740E?
The Fastlock feature improves lock times, and the Ftest/LD pin can be configured to output a signal indicating the PLL lock status.
- What is the phase noise performance of the LMX2541SQ3740E?
The device features ultra-low phase noise, with -103 dBc/Hz at 1 kHz offset at 3700 MHz output frequency and 100 MHz phase detector frequency.
- Can the VCO divider be programmed in the LMX2541SQ3740E?
Yes, the VCO divider can be programmed to any value from 2 to 63, as well as bypass mode in full chip mode.
- How is the PLL lock status indicated in the LMX2541SQ3740E?
The PLL lock status can be indicated through either an analog or digital lock detect signal on the Ftest/LD pin.
