Overview
The LMX2572LP, produced by Texas Instruments, is a low-power, high-performance wideband RF synthesizer capable of generating frequencies from 12.5 MHz to 2 GHz. This device is designed to operate with a single 3.3-V to 3.5-V power supply and integrates low-dropout regulators (LDOs), eliminating the need for external low-noise LDOs. It is particularly suited for applications requiring low power consumption and high frequency stability, such as test and measurement equipment, digital 2-way radios, and wireless communication systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3.0 | 3.3 | 3.5 | V |
| Supply Current (ICC) at 3.3V | - | 70 | - | mA |
| Phase Noise at 100-kHz Offset with 800-MHz Carrier | - | -124 | - | dBc/Hz |
| PLL Figure of Merit | - | -232 | - | dBc/Hz |
| PLL Normalized 1/f Noise | - | -123.5 | - | dBc/Hz |
| VCO Frequency Range | 3200 | - | 6400 | MHz |
| Ambient Temperature Range | -40 | - | 85 | °C |
| Junction Temperature Range | - | - | 125 | °C |
Key Features
- Output frequency range from 12.5 MHz to 2 GHz without an internal doubler.
- Low power consumption: 70 mA at 3.3-V supply.
- Support for FSK direct digital modulation with discrete 2-, 4-, or 8-level FSK and arbitrary level FSK.
- Fast VCO calibration speed: less than 20 µs.
- Synchronization of output phase across multiple devices.
- Support for ramp and chirp functions.
- Two programmable output power level differential outputs.
- Integrated LDOs from a single 3.3-V supply.
- Digital logic interface compatible with 1.8-V input.
- Programmable through a serial interface.
Applications
- Test and measurement equipment.
- Digital 2-way radios.
- Low power radio communication systems.
- Satellite communication.
- Wireless microphones.
- Proprietary wireless connectivity.
- MIMO (Multiple Input Multiple Output) systems.
- High-speed data converter clocking.
Q & A
- What is the output frequency range of the LMX2572LP?
The LMX2572LP can generate frequencies from 12.5 MHz to 2 GHz. - What is the typical supply current of the LMX2572LP at 3.3V?
The typical supply current is 70 mA. - What is the phase noise performance of the LMX2572LP at 100-kHz offset with an 800-MHz carrier?
The phase noise is –124 dBc/Hz. - Does the LMX2572LP support FSK modulation?
Yes, it supports FSK direct digital modulation with various levels. - How fast is the VCO calibration speed of the LMX2572LP?
The VCO calibration speed is less than 20 µs. - Can the LMX2572LP synchronize the output phase across multiple devices?
Yes, it supports phase synchronization across multiple devices. - What is the operating temperature range of the LMX2572LP?
The operating temperature range is –40°C to 85°C. - Does the LMX2572LP require external low-noise LDOs?
No, it integrates LDOs from a single 3.3-V supply. - How is the LMX2572LP programmed?
The device is programmed through a serial interface. - What are some common applications of the LMX2572LP?
Common applications include test and measurement equipment, digital 2-way radios, and wireless communication systems.
