LMX2485QSQX/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: The LMX2485QSQX/NOPB is a high-performance frequency synthesizer designed for use in various communication systems, including wireless base stations, satellite communications, and radar systems.

Characteristics: - High-frequency accuracy and stability - Wide frequency range - Low phase noise - Fast frequency hopping capability - Low power consumption

Package: The LMX2485QSQX/NOPB is available in a small outline 16-pin WQFN package.

Essence: This IC is essential for generating stable and accurate frequencies required in communication systems.

Packaging/Quantity: The LMX2485QSQX/NOPB is typically sold in reels of 2500 units.

Specifications

• Frequency Range: 10 MHz to 6 GHz
• Frequency Resolution: 1 Hz
• Phase Noise: -120 dBc/Hz at 1 MHz offset
• Supply Voltage: 3.3 V
• Current Consumption: 100 mA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LMX2485QSQX/NOPB features the following pin configuration:

1. VCO Output
2. RF Output
3. GND
4. Charge Pump Output
5. Loop Filter Input
6. Loop Filter Output
7. Reference Input
8. Digital Ground
9. Serial Data Input
10. Serial Clock Input
11. Lock Detect Output
12. Power Down Control
13. VCO Bias
14. Analog Ground
15. VCC
16. VCO Input

Functional Features

• Fractional-N PLL architecture
• Programmable dual-modulus prescaler
• On-chip voltage-controlled oscillator (VCO)
• Programmable charge pump
• Integrated loop filter
• Serial interface for control and configuration

Advantages and Disadvantages

Advantages: - High-frequency accuracy and stability ensure reliable communication performance. - Wide frequency range allows for versatile applications. - Low phase noise enables clear signal transmission. - Fast frequency hopping capability supports agile communication systems. - Low power consumption helps reduce energy usage.

Disadvantages: - Limited availability in small quantities may pose challenges for prototyping or low-volume projects. - Complex pin configuration requires careful attention during circuit design.

Working Principles

The LMX2485QSQX/NOPB utilizes a fractional-N PLL architecture to generate precise frequencies. It incorporates a voltage-controlled oscillator (VCO) that can be tuned over a wide frequency range. The PLL compares the VCO output with a reference input and adjusts the division ratio using a dual-modulus prescaler and programmable charge pump. The integrated loop filter ensures stable operation by filtering out unwanted noise and spurious signals.

Detailed Application Field Plans

The LMX2485QSQX/NOPB finds applications in various communication systems, including: 1. Wireless Base Stations: Provides accurate frequency synthesis for cellular networks, enabling reliable wireless communication. 2. Satellite Communications: Supports satellite transceivers by generating stable frequencies required for uplink and downlink operations. 3. Radar Systems: Enables precise frequency generation for radar systems used in military, aerospace, and weather monitoring applications.

Detailed and Complete Alternative Models

1. LMX2492QSQX/NOPB: Similar to LMX2485QSQX/NOPB but offers higher frequency resolution and lower phase noise.
2. LMX2594QSQX/NOPB: A high-performance frequency synthesizer with an extended frequency range and advanced features for demanding applications.
3. LMX2830QSQX/NOPB: Designed for low-power applications, this synthesizer offers reduced current consumption while maintaining good performance.

These alternative models provide options with varying specifications to suit different requirements in frequency synthesis.

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