Overview
The LMX2694SRTCTSEP, produced by Texas Instruments, is a high-performance, wideband phase-locked loop (PLL) with an integrated voltage-controlled oscillator (VCO) and voltage regulators. This device is designed to operate over a wide frequency range of 39.3 MHz to 15.1 GHz without the need for a doubler, thus eliminating the requirement for ½ harmonic filters. It features a fractional-N PLL with a programmable delta-sigma modulator, allowing for fine frequency steps and deterministic phase control. The device is radiation hardened and suitable for aerospace and other demanding applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Output Frequency Range | 39.3 MHz | - | 15.1 GHz | - |
| VCO Frequency Range | 7550 MHz | - | 15100 MHz | - |
| Phase Noise at 100 kHz Offset (15 GHz carrier) | -110 | - | - | dBc/Hz |
| Power Supply Voltage | -0.3 V | 3.3 V | 3.6 V | V |
| Junction Temperature | -55 °C | - | 150 °C | °C |
| Storage Temperature | -65 °C | - | 150 °C | °C |
| Supply Current (Typical at 3.3 V, 25 °C) | - | -129 dBc/Hz | - | mA |
| High-Level Input Voltage | 1.4 V | - | - | V |
| Low-Level Input Voltage | 0.4 V | - | - | V |
Key Features
- Wide Frequency Range: The device can output any frequency between 39.3 MHz and 15.1 GHz without a doubler.
- Integrated VCO and Voltage Regulators: The VCO operates from 7550 to 15100 MHz, and integrated voltage regulators eliminate the need for high-performance external LDOs.
- Fractional-N PLL: Features a programmable delta-sigma modulator up to the 3rd order, allowing for fine frequency steps and deterministic phase control.
- Deterministic Phase Control: The SYNC pin allows for deterministic phase relationship between the OSCIN and RFOUTx pins, with adjustable phase in fine steps.
- JESD204B Support: The RFOUTB output can be used as a differential SYSREF output, compliant with the JESD204B standard.
- Ultra-Fast VCO Calibration: Designed for applications where the frequency must be swept or abruptly changed.
- Single 3.3-V Power Supply: Simplifies power management with integrated LDOs.
Applications
- Aerospace and Defense: Suitable for radiation-hardened applications in aerospace and defense due to its enhanced reliability and performance.
- High-Speed Data Converters: Can be used as a low-noise clock source for high-speed data converters, particularly those requiring JESD204B compliance.
- Telecommunications and Wireless Systems: Ideal for wideband frequency synthesis in telecommunications and wireless systems.
- Test and Measurement Equipment: Used in test and measurement equipment requiring high-frequency stability and low phase noise.
Q & A
- What is the output frequency range of the LMX2694SRTCTSEP?
The output frequency range is from 39.3 MHz to 15.1 GHz.
- What type of PLL does the LMX2694SRTCTSEP feature?
The device features a fractional-N PLL with a programmable delta-sigma modulator.
- What is the phase noise performance of the LMX2694SRTCTSEP at 100 kHz offset with a 15 GHz carrier?
The phase noise is –110 dBc/Hz at 100 kHz offset with a 15 GHz carrier.
- Does the LMX2694SRTCTSEP support JESD204B?
Yes, the device supports JESD204B through its differential SYSREF output.
- What is the power supply voltage requirement for the LMX2694SRTCTSEP?
The device requires a single 3.3-V power supply.
- How does the LMX2694SRTCTSEP achieve deterministic phase control?
The device achieves deterministic phase control through the SYNC pin, allowing for adjustable phase in fine steps.
- What is the junction temperature range for the LMX2694SRTCTSEP?
The junction temperature range is from –55 °C to 150 °C.
- What is the storage temperature range for the LMX2694SRTCTSEP?
The storage temperature range is from –65 °C to 150 °C.
- Does the LMX2694SRTCTSEP require external LDOs?
No, the device has integrated voltage regulators that eliminate the need for high-performance external LDOs.
- What are some typical applications of the LMX2694SRTCTSEP?
Typical applications include aerospace and defense, high-speed data converters, telecommunications, and test and measurement equipment.
