Overview
The LMX2581SQ/NOPB is a wideband frequency synthesizer produced by Texas Instruments. It integrates a delta-sigma fractional N PLL, multiple core VCO, programmable output divider, and two differential output buffers. This device is designed for high-performance applications requiring low noise and wide frequency range capabilities. It operates on a single supply voltage from 3.15 V to 3.45 V and is packaged in a 32-pin WQFN (RTV) package, making it suitable for a variety of RF and microwave systems.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LMX2581SQ/NOPB |
| Package Type | 32-WQFN (RTV) |
| Operating Temperature Range | -40 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 |
| Normalized PLL Phase Noise | -229 dBc/Hz |
| Normalized PLL 1/f Noise | -120.8 dBc/Hz |
| VCO Phase Noise | -137 dBc/Hz @ 1 MHz offset for a 2.5 GHz Carrier |
| RMS Jitter in Integer Mode | 100 fs |
| Supply Voltage | 3.15 V to 3.45 V |
| Current Consumption | 178 mA |
Key Features
- Wideband frequency synthesizer with integrated VCO
- Supports fractional and integer modes
- Programmable fractional modulator order and denominator
- Programmable output power up to +12 dBm
- Programmable 32-level charge pump current
- Option to use an external VCO
- Digital lock detect and fastlock features
- Auto mute and power down capabilities
- 3-wire serial interface and readback feature
- Integrated low noise LDOs for superior noise immunity
Applications
The LMX2581SQ/NOPB is suitable for various high-performance RF and microwave applications, including:
- Wireless communication systems
- Radar systems
- Test and measurement equipment
- Base stations and repeaters
- Satellite communication systems
Q & A
- What is the operating temperature range of the LMX2581SQ/NOPB?
The operating temperature range is -40 to 85°C.
- What is the output frequency range of the LMX2581SQ/NOPB?
The output frequency range is from 50 MHz to 3760 MHz.
- What is the normalized PLL phase noise of the LMX2581SQ/NOPB?
The normalized PLL phase noise is -229 dBc/Hz.
- Can the LMX2581SQ/NOPB be used with an external VCO?
- What is the supply voltage range for the LMX2581SQ/NOPB?
The supply voltage range is from 3.15 V to 3.45 V.
- Does the LMX2581SQ/NOPB support fractional and integer modes?
- What is the current consumption of the LMX2581SQ/NOPB?
The current consumption is 178 mA.
- What interface does the LMX2581SQ/NOPB use for programming?
- Does the LMX2581SQ/NOPB have integrated low noise LDOs?
- What is the package type of the LMX2581SQ/NOPB?
