Overview
The LMX2571NJKT from Texas Instruments is a low-power, high-performance, wideband PLLatinum™ RF synthesizer. This device integrates a delta-sigma fractional N PLL, multiple core voltage-controlled oscillators (VCOs), programmable output dividers, and two output buffers. It supports continuous output frequencies ranging from 10 MHz to 1344 MHz, making it versatile for various RF applications. The synthesizer can operate in both synthesizer mode and PLL mode, allowing the use of either the internal VCO or an external VCO. It features advanced functionalities such as FastLock technique for rapid frequency switching and integrated SPDT switch for transmit/receive applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC Power Supply Voltage | 3.15 | 3.45 | 3.45 | V |
| VIO IO Supply Voltage | VCC | VCC | VCC | V |
| VCP Charge Pump Supply Voltage (PLL mode) | 5 | 5 | 5 | V |
| Ambient Temperature | -40 | - | 85 | °C |
| Junction Temperature | - | - | 125 | °C |
| VCO Frequency Range | 10 MHz | - | 1344 MHz | MHz |
| Prescaler Value | 2 | - | 4 | - |
| Package Type | - | - | WQFN (36-pin) | - |
| Package Size | - | - | 6.00 mm × 6.00 mm | mm |
Key Features
- Low-power, high-performance RF synthesizer with integrated delta-sigma fractional N PLL.
- Multiple core VCOs with frequencies up to 5.376 GHz.
- Programmable output dividers and two output buffers.
- Supports both synthesizer mode and PLL mode with internal or external VCO.
- FastLock technique for rapid frequency switching (< 1.5 ms).
- Integrated SPDT switch for transmit/receive applications.
- Direct digital FSK modulation with discrete 2-, 4-, and 8-level FSK, and arbitrary-level FSK.
- Pulse shaping FSK and analog FM modulation capabilities.
- Single 3.3-V power supply with 1.8-V input compatible digital logic interface.
- Integrated LDOs for analog blocks, eliminating the need for external high-performance LDOs.
- Programming through MICROWIRE interface.
Applications
- Low Power Radio Communication Systems
- Satcom Modem
- Wireless Microphone
- Proprietary Wireless Connectivity
- Handheld Test and Measurement Equipment
- FDD (Frequency Division Duplex) radio applications
Q & A
- What is the LMX2571NJKT?
The LMX2571NJKT is a low-power, high-performance RF synthesizer from Texas Instruments, integrating a delta-sigma fractional N PLL and multiple core VCOs.
- What is the frequency range of the LMX2571NJKT?
The device can produce frequencies ranging from 10 MHz to 1344 MHz.
- What are the operating modes of the LMX2571NJKT?
The device operates in both synthesizer mode and PLL mode, allowing the use of either the internal VCO or an external VCO.
- What is the FastLock technique in the LMX2571NJKT?
The FastLock technique allows for rapid frequency switching in less than 1.5 ms, even with a narrow loop bandwidth.
- Does the LMX2571NJKT support FSK modulation?
Yes, it supports direct digital FSK modulation, including discrete 2-, 4-, and 8-level FSK, and arbitrary-level FSK.
- What is the power supply requirement for the LMX2571NJKT?
The device requires a single 3.3-V power supply, with the digital logic interface being 1.8-V input compatible.
- How is the device programmed?
The device is programmed through the MICROWIRE interface.
- What is the package type and size of the LMX2571NJKT?
The device comes in a 36-pin WQFN package, measuring 6.00 mm × 6.00 mm.
- What are some typical applications of the LMX2571NJKT?
Typical applications include low power radio communication systems, satcom modems, wireless microphones, and handheld test and measurement equipment.
- Does the LMX2571NJKT have integrated LDOs?
Yes, the device has integrated LDOs for the analog blocks, eliminating the need for external high-performance LDOs.
