Overview
The LMX2486SQ/NOPB is a high-performance, low-power delta-sigma fractional-N PLL (Phase-Locked Loop) frequency synthesizer produced by Texas Instruments. This device is designed for a wide range of applications requiring precise frequency synthesis, particularly in the frequency range of 1 GHz to 4.5 GHz.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency Range (RF PLL) | 1.0 GHz to 4.5 GHz | GHz |
| Operating Frequency Range (IF PLL) | Up to 1.5 GHz | GHz |
| Power Supply Voltage | 2.5 V to 3.6 V | V |
| Current Consumption (Typical) | 8.5 mA | mA |
| Package Type | 24-lead WQFN (Exposed Pad) | - |
| Package Size | 4.0 mm × 4.0 mm × 0.8 mm | mm |
| ESD Rating (Human-body model) | ±2000 V | V |
| Junction-to-ambient Thermal Resistance | 47.2 °C/W | °C/W |
Key Features
- Advanced delta-sigma fractional compensation with up to 4th order programmable delta-sigma modulator.
- Quadruple modulus prescaler for lower divisors.
- Integrated time-out counter and fastlock/cycle slip reduction requiring only a single-word write.
- Digital lock detect output and hardware/software power-down control.
- On-chip crystal reference frequency doubler.
- RF phase detector frequency up to 50 MHz.
- Three-line, high-speed (20-MHz) MICROWIRE interface for programming.
- Low spurs and fast programming speed with single-word write capability.
Applications
- Cellular phones and base stations.
- Satellite and cable TV tuners.
- WLAN standards and other wireless communication systems.
- Direct digital modulation applications.
Q & A
- What is the operating frequency range of the LMX2486SQ/NOPB RF PLL?
The operating frequency range of the LMX2486SQ/NOPB RF PLL is from 1.0 GHz to 4.5 GHz.
- What is the power supply voltage range for the LMX2486SQ/NOPB?
The power supply voltage range is from 2.5 V to 3.6 V.
- What type of package does the LMX2486SQ/NOPB come in?
The LMX2486SQ/NOPB comes in a 24-lead WQFN (Exposed Pad) package.
- What is the typical current consumption of the LMX2486SQ/NOPB?
The typical current consumption is 8.5 mA.
- What is the purpose of the delta-sigma modulator in the LMX2486SQ/NOPB?
The delta-sigma modulator is used to push fractional spurs to higher frequencies outside the loop bandwidth, improving phase noise and spur performance.
- How is the LMX2486SQ/NOPB programmed?
The LMX2486SQ/NOPB is programmed through a three-line, high-speed (20-MHz) MICROWIRE interface.
- What are some of the key applications of the LMX2486SQ/NOPB?
Key applications include cellular phones and base stations, satellite and cable TV tuners, WLAN standards, and direct digital modulation applications.
- What is the ESD rating of the LMX2486SQ/NOPB?
The ESD rating is ±2000 V according to the human-body model.
- What is the junction-to-ambient thermal resistance of the LMX2486SQ/NOPB?
The junction-to-ambient thermal resistance is 47.2 °C/W.
- Is the LMX2486SQ/NOPB recommended for new designs?
No, the LMX2486SQ/NOPB is not recommended for new designs as it has been announced for discontinuation and is in the lifetime-buy period.
