6.4-GSPS, 12-bit ADC and wideband 15-GHz PLL with VCO drive perfomance
The wideband ADC12DJ3200 is the fastest 12-bit ADC, delivering speeds up to 6.4 GSPS. The LMX2594 is the industry’s first wideband PLL to generate frequencies of up to 15 GHz without using an internal frequency doubler.
High-density phased-array radar systems, 5G systems and satellite communications demand increased data throughput, higher bandwidth and lower power, all in smaller a footprint. A multi-node synchronization reference design demonstrates how the ADC12DJ3200 and LMX2594 provide accurate, time-stable synchronization for multi-node sampling systems including large-scale phased-array radars, digital storage oscilloscopes (DSOs) and 5G wireless testers. The reference design showcases the LMX2594’s SYSREF forwarding feature and the ADC12DJ3200’s aperture delay adjust, time stamp and calibration features to improve accuracy and ease system design.
Featuring a sample rate of 6.4 GSPS at a 12-bit resolution –18 percent faster than competitive devices – the ADC12DJ3200 enables designers to capture the widest bandwidth possible to process more information instantaneously.
With direct radio-frequency (RF) sampling up to 10 GHz covering the L-band, S-band and C-band and extending into the X-band, the ADC12DJ3200 enables simplified system architectures and provides enhanced frequency agility, while reducing filter complexity, in turn save board space and component count. The 10-mm-by-10-mm device integrates an entire RF-to-bits receiver, reducing board space by up to 88 percent compared to competing products while enabling designers to reduce cost by simplifying the system architecture. Consuming as little as 3 W, the ADC provides twice the input frequency range at half the power of competing devices.The LMX2594 RF PLL with VCO offers the following features and benefits to make it easier for engineers to design a high-frequency RF signal chain:
The LMX2594 features a normalized PLL noise floor of -236 dBc/Hz and 1/f of -129 dBc/Hz, enabling designers to improve radio sensitivity and spectral resolution. The integrated VCO operates at up to 15 GHz, eliminating the need for expensive, complex on-board filters to remove subharmonics. The LMX2594 also automatically generates a frequency ramp, eliminating up to five devices typically required to perform this function for radar applications and enabling compact systems. System designers can easily synchronize the output of all on-board PLLs, saving design time for implementing multiple-input/multiple-output (MIMO), beamforming in their applications.
The LMX2594 enables simultaneous generation of gigahertz frequency sampling and JESD204B SYSREF timing signals.
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