描述 Description

The RC32112A regenerates and distributes ultra-low jitter clock outputs and features up to 6 independent frequency domains that can be either locked to the external reference clock or locked to a free-run crystal or oscillator. Digital PLLs (DPLLs) support hitless reference switching between references from redundant timing sources. The device supports multiple independent timing channels for: IEEE 1588 clock synthesis; SyncE clock generation; jitter attenuation and radio clock generation including SYSREF generation for converters. Input-to-input, input-to-output and output-to-output phase skew can all be precisely managed. ?The device outputs ultra-low-jitter clocks that can directly synchronize SERDES running at up to 56Gbps; as well as CPRI/OBSAI, SONET/SDH ADC/DAC. The device is ideal for use in 100G/200G/400G/800G telecom switch line cards, fabric cards and wireless small cell applications.

特性 Features

? Two timing channels and six independent frequency domains
? Output jitter below 100fs RMS
? Digital PLLs (DPLLs) lock to any frequency from 0.5kHz to 1GHz
? DPLLs / Digitally Controlled Oscillators (DCOs) generate any frequency from 0.5Hz to 1GHz
? DCO outputs can be aligned in phase and frequency with the outputs of any DPLL or DCO
? Can be used as a jitter attenuator, clock generator, or synchronizer
? Reference monitors qualify/disqualify references depending on LOS, activity, frequency monitoring and/or LOS input pins
? Automatic reference selection state machines select the active reference for each DPLL based on the reference monitors, priority tables, revertive / non-revertive and other programmable settings
? Device requires a crystal oscillator or fundamental-mode crystal: 25MHz to 54MHz
? The device can configure itself automatically after reset via:
? Internal Customer-programmable One-Time Programmable memory
? Standard external I2C EPROM via separate I2C Master Port