LMX2485QSQ/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: The LMX2485QSQ/NOPB is a high-performance frequency synthesizer designed for use in various wireless communication systems. It provides precise frequency synthesis and modulation capabilities, making it suitable for applications such as cellular base stations, satellite communications, and wireless local area networks.

Characteristics: - High-frequency accuracy and stability - Wide frequency range coverage - Low phase noise and spurious output - Flexible modulation options - Compact and durable packaging

Packaging/Quantity: The LMX2485QSQ/NOPB is available in a small outline package (SOP) with 16 pins. It is typically sold in reels containing 250 units.

Specification Parameters

The LMX2485QSQ/NOPB offers a comprehensive set of specification parameters, including:

1. Frequency Range: 10 MHz to 6 GHz
2. Frequency Resolution: 1 Hz
3. Phase Noise: -120 dBc/Hz at 1 MHz offset
4. Spurious Output: -70 dBc
5. Modulation Types: FM, PM, FSK, PSK
6. Supply Voltage: 3.3 V
7. Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LMX2485QSQ/NOPB features the following pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. RFout: RF output signal
4. VCOin: Voltage-controlled oscillator input
5. Refin: Reference input for frequency synthesis
6. Modin: Modulation input
7. CE: Chip enable control
8. LD: Lock detect output
9. CP: Charge pump output
10. Loop Filter: External loop filter connection

Functional Characteristics

The LMX2485QSQ/NOPB offers the following functional characteristics:

1. Frequency Synthesis: The IC generates precise and stable output frequencies based on the reference input and control signals.
2. Modulation Capabilities: It supports various modulation types, allowing for flexible signal generation.
3. Lock Detection: The lock detect output indicates when the synthesizer has achieved phase-locked operation.
4. Charge Pump: The charge pump output provides the necessary current for controlling the voltage-controlled oscillator.

Advantages and Disadvantages

Advantages: - High-frequency accuracy ensures reliable communication performance. - Wide frequency range coverage allows for versatile applications. - Low phase noise and spurious output result in clean and interference-free signals. - Flexible modulation options enable customization for different communication systems.

Disadvantages: - Limited operating temperature range may restrict certain extreme environment applications. - Complex pin configuration requires careful circuit design and layout considerations.

Working Principle

The LMX2485QSQ/NOPB operates based on a phase-locked loop (PLL) architecture. It uses a reference input signal and control inputs to generate a highly stable output frequency. The PLL compares the phase and frequency of the reference input with the voltage-controlled oscillator's output, adjusting the VCO's control voltage to achieve phase lock. The charge pump and loop filter help maintain the stability and accuracy of the output frequency.

Detailed Application Field Plans

The LMX2485QSQ/NOPB finds extensive application in the following fields:

1. Cellular Base Stations: It provides accurate frequency synthesis for cellular networks, ensuring reliable communication between base stations and mobile devices.
2. Satellite Communications: The IC enables precise frequency generation for satellite communication systems, facilitating data transmission and reception.
3. Wireless Local Area Networks (WLAN): It supports frequency synthesis for WLAN devices, enabling seamless wireless connectivity in homes, offices, and public spaces.

Detailed Alternative Models

1. LMX2486QSQ/NOPB: Similar to the LMX2485QSQ/NOPB, this model offers extended frequency range coverage up to 10 GHz.
2. LMX2492QSQ/NOPB: This alternative model provides additional advanced modulation capabilities, including QAM and OFDM.

Please note that the information provided above is subject to change. For the most accurate and up-to-date specifications, refer to the product datasheet or contact the manufacturer directly.

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