LMH1983 Video Clock Generator with Audio Clock

Texas Instruments' LMH 3G/HD/SD video clock generator with audio clock intended for broadcast and professional applications

Image of Texas Instruments' LMH1983 Video Clock Generator with Audio ClockTexas Instruments' LMH1983 is a highly-integrated programmable audio/video (A/V) clock generator 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. The LMH1983 series offers low jitter reference clocks for any SDI transmitter to meet stringent output jitter specifications without additional clock cleaning circuits. It is offered in a space-saving 6 mm x 6 mm 40-pin LLP package.

Functional Block Diagram

  • Four PLLs for simultaneous A/V clock generation
    • PLL1: 27 or 13.5 MHz
    • PLL2: 148.5 or 74.25 MHz
    • PLL3: 148.5/1.001 or 74.25/1.001 MHz
    • PLL4: 98.304 MHz / 2X (X = 0 to 15)
  • Flexible PLL bandwidth to optimize jitter performance and lock time
  • 3 x 2 video clock crosspoint
  • Soft re-synchronization to new reference
  • Digital holdover or free run on loss of reference
  • Status flags for loss of reference and loss of PLL lock
  • 3.3 V single supply operation
  • I2C interface with address select pin (3 states)
  • Triple rate (3G/HD/SD) SDI SerDes
  • FPGA reference clock generation/cleaning
  • Audio embed/de-embed
  • Video cameras
  • Frame synchronizers (genlock, DARS)
  • A-D/D-A conversion, editing, processing cards
  • Keyers and logo inserters
  • Format/standards converters
  • Video displays and projectors
  • A/V test and measurement equipment

Video Clock Generator

ImageManufacturer Part NumberDescriptionTypeApplicationsAvailable QuantityView Details
LMH1983SQE/NOPB datasheet linkIC VID CLK GEN MULTI RATE 40WQFNLMH1983SQE/NOPBIC VID CLK GEN MULTI RATE 40WQFNClock GeneratorVideo Equipment1507 - Immediate
LMH1983SQE/NOPB product page link
Published: 2010-08-27