Overview
The LMX2491RTWR is a 6.4-GHz low-noise RF Phase-Locked Loop (PLL) with ramp and chirp generation, manufactured by Texas Instruments. This device is designed for high-frequency applications and features a delta-sigma fractional N PLL architecture. It supports a wide frequency range of 500 MHz to 6.4 GHz and is capable of operating with a single 3.3-V supply, although the charge pump supply can range from 3.15 V to 5.25 V. The LMX2491RTWR is housed in a 24-pin WQFN package and is suitable for various high-frequency applications due to its low noise and versatile modulation capabilities.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency Range | 500 MHz to 6.4 GHz | Hz |
| Supply Voltage (Nominal) | 3.3 | V |
| Supply Voltage (Charge Pump) | 3.15 to 5.25 | V |
| Phase Detector Frequency (Maximum) | 200 MHz | Hz |
| PLL Noise | -227 dBc/Hz (Normalized) | dBc/Hz |
| Package Type | WQFN-24 | |
| Operating Temperature Range | -40 to 85 | °C |
| Moisture Sensitivity Level | 3 |
Key Features
- Low noise performance with -227 dBc/Hz normalized PLL noise
- Wideband PLL operation from 500 MHz to 6.4 GHz
- Versatile ramp and chirp generation capabilities
- Support for FSK, PSK, and configurable piecewise linear FM modulation profiles up to 8 segments
- Digital lock detect and fast lock capability
- Single 3.3-V supply operation with optional charge pump supply up to 5.25 V
- Programmable charge pump and high frequency input for external VCO
- Input/Output multiplexed pins for ramp triggers, FSK/PSK modulation, FastLock, and diagnostics
Applications
- FMCW Radars
- Military Radars
- Microwave Backhaul
- Test and Measurement
- Satellite Communications
- Wireless Infrastructure
- Sampling Clock for High-Speed ADC/DAC
Q & A
- What is the operating frequency range of the LMX2491RTWR?
The LMX2491RTWR operates in a frequency range of 500 MHz to 6.4 GHz.
- What is the nominal supply voltage for the LMX2491RTWR?
The nominal supply voltage is 3.3 V, although the charge pump supply can range from 3.15 V to 5.25 V.
- What is the maximum phase detector frequency of the LMX2491RTWR?
The maximum phase detector frequency is 200 MHz.
- What type of modulation does the LMX2491RTWR support?
The device supports FSK, PSK, and configurable piecewise linear FM modulation profiles up to 8 segments.
- What is the package type of the LMX2491RTWR?
The LMX2491RTWR is housed in a 24-pin WQFN package.
- What is the operating temperature range of the LMX2491RTWR?
The operating temperature range is -40 to 85°C.
- Does the LMX2491RTWR support digital lock detect?
Yes, the device supports digital lock detect and fast lock capability.
- Can the LMX2491RTWR operate with a single supply voltage?
Yes, the device can operate with a single 3.3-V supply.
- What are some common applications of the LMX2491RTWR?
Common applications include FMCW Radars, Military Radars, Microwave Backhaul, Test and Measurement, Satellite Communications, Wireless Infrastructure, and as a sampling clock for high-speed ADC/DAC.
- Is the LMX2491RTWR RoHS compliant?
Yes, the LMX2491RTWR is RoHS compliant.
