The LMH1983SQE/NOPB is a Video Clock Generator with an audio clock. It is intended for broadcast and professional applications. It can replace multiple PLLs and VCXOs used in applications supporting SMPTE serial digital video (SDI) and digital audio AES3/EBU standards. It offers low-jitter reference clocks for any SDI transmitter to meet stringent output jitter specifications without additional clock cleaning circuits. The LMH1983 features automatic input format detection, simple programming of multiple A/V output formats, genlock or digital free-run modes and override programmability of various automatic functions. The recognized input formats include HVF syncs for the major video standards, 27MHz, 10MHz and 32/44.1/48/96kHz audio word clocks. The dual-stage PLL architecture integrates four PLLs with three on-chip VCOs. The first stage (PLL1) uses an external low-noise 27MHz VCXO with narrow loop bandwidth to provide a clean reference clock for the next stage.
● Flexible PLL bandwidth to optimize jitter performance and lock time
● Soft resynchronization to new reference
● Digital holdover or free-run on loss of reference
● Status flags for loss of reference and loss of PLL lock
● Green product and no Sb/Br
●Device has limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
