Overview
The LMX2531LQ1742/NOPB is a high-performance frequency synthesizer system developed by Texas Instruments. This monolithic integrated circuit is fabricated in an advanced BiCMOS process, offering superior performance and reliability. The device is designed to generate very stable, low-noise local-oscillator signals for up and down conversion in various wireless communication devices. It features a fractional-N delta-sigma modulator, fast lock and cycle slip reduction, and a partially integrated adjustable loop filter, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency Range | 1760 - 1866 | MHz |
| Supply Voltage (VCC) | 2.8 - 3.2 | V |
| Operating Current | Typically 60 mA | mA |
| Power-Down Current | Typically 1 μA | μA |
| Output Power to 50-Ω Load | 1 - 3.5 | dBm |
| Phase Noise at 10-kHz Offset | -96 | dBc/Hz |
| Phase Noise at 100-kHz Offset | -122 | dBc/Hz |
| Phase Noise at 1-MHz Offset | -142 | dBc/Hz |
| Phase Noise at 5-MHz Offset | -152 | dBc/Hz |
| Temperature Range | -40°C to 85°C | °C |
| Package Type | 36-Pin WQFN |
Key Features
- Fractional-N delta-sigma modulator for higher supply-noise immunity and consistent performance.
- FastLock and cycle slip reduction with timeout counter for quick locking.
- Partially integrated, adjustable loop filter for flexible design.
- Very low phase noise and spurs, enhancing signal quality.
- Integrated tank inductor for reduced external component count.
- Low operating current and power-down current for energy efficiency.
- Automotive, CATV, instrumentation, and RFID applications support.
- Programmable up to fourth-order delta-sigma modulator.
Applications
- Wireless communication devices for up and down conversion.
- Automotive systems requiring stable and low-noise signals.
- CATV equipment for reliable signal transmission.
- Instrumentation and test equipment where precision is crucial.
- RFID readers and other applications needing high-frequency stability.
- Data converter clocking where low jitter is essential.
Q & A
- What is the primary function of the LMX2531LQ1742/NOPB?
The primary function is to generate stable, low-noise local-oscillator signals for wireless communication devices. - What is the operating frequency range of the LMX2531LQ1742/NOPB?
The operating frequency range is 1760 - 1866 MHz. - What is the supply voltage range for this device?
The supply voltage range is 2.8 - 3.2 V. - What are the key features of the fractional-N delta-sigma modulator in this device?
The fractional-N delta-sigma modulator provides higher supply-noise immunity and more consistent performance. - How does the FastLock feature benefit the device?
The FastLock feature reduces cycle slip and includes a timeout counter, enabling quick locking of the PLL. - What types of applications is the LMX2531LQ1742/NOPB suitable for?
It is suitable for automotive, CATV, instrumentation, RFID, and data converter clocking applications. - What is the typical operating current of the LMX2531LQ1742/NOPB?
The typical operating current is around 60 mA. - What is the power-down current of the device?
The power-down current is typically 1 μA. - How does the integrated tank inductor benefit the design?
The integrated tank inductor reduces the need for external components, simplifying the design. - What are the phase noise specifications at different offsets?
The phase noise is -96 dBc/Hz at 10-kHz offset, -122 dBc/Hz at 100-kHz offset, -142 dBc/Hz at 1-MHz offset, and -152 dBc/Hz at 5-MHz offset.
