Overview
The LMX2581SQE/NOPB is a low noise wideband frequency synthesizer produced by Texas Instruments. This device integrates a delta-sigma fractional N PLL, multiple core VCO, programmable output divider, and two differential output buffers. It is designed to provide high performance and flexibility in frequency synthesis, making it suitable for a variety of applications requiring precise and stable frequency generation.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 32-pin WQFN (RTV) |
| Operating Temperature Range | -40°C to 85°C |
| Output Frequency Range | 50 MHz to 3760 MHz |
| Input Clock Frequency | Up to 900 MHz |
| Phase Detector Frequency | Up to 200 MHz |
| VCO Frequency Range | 1880 MHz to 3760 MHz |
| Output Power | 3 dBm to +12 dBm at 2700 MHz |
| Normalized PLL Phase Noise | -229 dBc/Hz |
| Normalized PLL 1/f Noise | -120.8 dBc/Hz |
| VCO Phase Noise @ 1 MHz offset for a 2.5 GHz Carrier | -137 dBc/Hz |
| RMS Jitter in Integer Mode | 100 fs |
| Supply Voltage | 3.15 V to 3.45 V |
| Logic Levels | Down to 1.6 V |
Key Features
- Supports fractional and integer modes
- Programmable fractional modulator order and denominator
- Programmable output power and 32-level charge pump current
- Option to use an external VCO
- Digital lock detect and 3-wire serial interface with readback
- Integrated low noise LDOs for superior noise immunity
- Features such as power down, Fastlock, auto mute, and lock detection
Applications
The LMX2581SQE/NOPB is suitable for various applications requiring high-performance frequency synthesis, including but not limited to:
- Wireless communication systems (e.g., 5G, LTE, Wi-Fi)
- RF and microwave systems
- Test and measurement equipment
- Medical imaging and diagnostic equipment
- Aerospace and defense systems
Q & A
- What is the output frequency range of the LMX2581SQE/NOPB? The output frequency range is from 50 MHz to 3760 MHz.
- What is the maximum input clock frequency? The maximum input clock frequency is up to 900 MHz.
- What is the phase noise performance of the LMX2581SQE/NOPB? The normalized PLL phase noise is -229 dBc/Hz.
- Can the LMX2581SQE/NOPB operate in both fractional and integer modes? Yes, it supports both fractional and integer modes.
- What is the supply voltage range for the LMX2581SQE/NOPB? The supply voltage range is from 3.15 V to 3.45 V.
- Does the LMX2581SQE/NOPB support external VCO usage? Yes, it has an option to use an external VCO.
- What is the package type and pin count of the LMX2581SQE/NOPB? It comes in a 32-pin WQFN (RTV) package.
- What are some of the convenient features included in the LMX2581SQE/NOPB? Features include power down, Fastlock, auto mute, and lock detection.
- How is the device programmed? All registers can be programmed through a simple 3-wire interface with a readback feature.
- What is the operating temperature range of the LMX2581SQE/NOPB? The operating temperature range is from -40°C to 85°C.
