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The 8V79S683NLGI is a fully integrated clock and SYSREF signal fanout buffer for JESD204B/C applications. This device is a high-performance clock and converter synchronization solution specifically designed for circuit boards of radio equipment in wireless base stations, complying with JESD204B/C subclasses 0, 1 and 2 standards.

Its main features include:

The distribution, fan-out and phase delay of clock and SYSREF signals

Extremely low output background noise: -158.8dBc/Hz background noise (245.76MHz)

Supports clock frequencies up to 3GHz, including clock output frequencies of 983.04MHz, 491.52MHz, 245.76MHz and 122.88MHz

There are 4 output channels, with a total of 16 differential outputs

Each channel contains a frequency divider and a clock phase delay circuit

Phase alignment mode across multiple buffers, with any crossover Settings

Flexible differential output (LVDS/LVPECL/ amplitude configurable)

Configuration is carried out through a 3-wire SPI interface

Power supply voltage

3.3V core and signal I/O

1.8V digital control SPI I/O (3.3V tolerance input)

64-VFQFPN package (9 × 9 × 0.85mm)

Ambient temperature range: -40°C to +105°C (enclosure)

In addition, the main function of the 8V79S683NLGI is to distribute and fan out the high-frequency clock and low-frequency system reference signals generated by the JESB204B clock generator (such as the 8V19N490), thereby expanding its fan out function and providing additional phase delay. The 8V79S683NLGI has been optimized to provide a clock with extremely low phase noise and precise phase-adjustable SYSREF synchronization signals. Low offset output, low inter-device offset characteristics, and fast output rise/fall times help the system design achieve deterministic clock and SYSREF phase relationships across devices.

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