Overview
The LMX2694-EP is a high-performance, wideband phase-locked loop (PLL) synthesizer developed by Texas Instruments. This device integrates a voltage-controlled oscillator (VCO) and voltage regulators, enabling it to output frequencies ranging from 39.3 MHz to 15.1 GHz without the need for a doubler. The VCO covers an entire octave, ensuring comprehensive frequency coverage down to 39.3 MHz. The PLL features a high figure of merit of –236 dBc/Hz and a high-phase detector frequency, resulting in very low in-band noise and integrated jitter. The device supports synchronization of output phase across multiple instances, making it suitable for applications requiring deterministic phase relationships.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|
| Output Frequency | 39.3 MHz | - | 15.1 GHz | - | - |
| Phase Noise at 100 kHz Offset | - | -110 dBc/Hz | - | - | At 15 GHz carrier |
| RMS Jitter | - | 54 fs | - | - | At 8 GHz, 100 Hz to 100 MHz |
| Phase Detector Frequency | 0.125 MHz | - | 250 MHz | - | MASH_ORDER = 0 |
| Power Supply Voltage | -0.3 V | 3.3 V | 3.6 V | V | - |
| Junction Temperature | -55°C | - | 150°C | °C | - |
| Supply Current | - | 360 mA | - | mA | OUTA_PD = 0; OUTB_PD = 1; OUTA_MUX = OUTB_MUX = 1; OUTA_PWR = 31; CPG = 7; fOSC = fPD = 100 MHz; fVCO = fOUT = 14.5 GHz |
Key Features
- Wideband output frequency range from 39.3 MHz to 15.1 GHz without a doubler.
- Low phase noise: –110 dBc/Hz at 100 kHz offset with a 15 GHz carrier.
- Ultra-low RMS jitter: 54 fs at 8 GHz (100 Hz to 100 MHz).
- Programmable output power and phase detector frequency up to 250 MHz.
- Support for synchronization of output phase across multiple devices.
- (SYSREF) support with 9-ps resolution programmable delay, compliant to JESD204B standard.
- Single 3.3-V power supply operation with integrated voltage regulators.
- Operating temperature range: –55°C to 125°C.
- Fractional-N PLL with a programmable delta-sigma modulator up to the 3rd order.
- Ultra-fast VCO calibration for frequency sweeping or abrupt changes.
Applications
- Defense radio and electronic warfare systems.
- Radar and active antenna systems (AAS) for mMIMO.
- Macro remote radio units and outdoor backhaul units.
- Data acquisition and high-speed data converters.
- Wireless communications test equipment.
Q & A
- What is the output frequency range of the LMX2694-EP?
The output frequency range is from 39.3 MHz to 15.1 GHz.
- What is the phase noise performance of the LMX2694-EP?
The phase noise is –110 dBc/Hz at 100 kHz offset with a 15 GHz carrier.
- What is the RMS jitter of the LMX2694-EP at 8 GHz?
The RMS jitter is 54 fs at 8 GHz (100 Hz to 100 MHz).
- Can the LMX2694-EP synchronize output phase across multiple devices?
- What is the power supply voltage requirement for the LMX2694-EP?
The device operates on a single 3.3-V power supply.
- What is the operating temperature range of the LMX2694-EP?
The operating temperature range is –55°C to 125°C.
- Does the LMX2694-EP support SYSREF for high-speed data converters?
- What type of PLL does the LMX2694-EP use?
- How does the LMX2694-EP handle VCO calibration?
- What are some typical applications of the LMX2694-EP?
