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Details for Texas Instruments


Multi-Rate Video Clock Generator with Genlock
Buy Directly from Texas Instruments (4401 in Stock)
$17.2000 per unit
Series Information for LMH1982SQE/NOPB - Texas Instruments


  • feature
    3.3-V and 2.5-V Supplies
  • feature
    External Loop Filter Allows Control of Loop Bandwidth, Jitter Transfer, and Lock Time Characteristics
  • feature
    Free Run or Holdover Operation on Loss of Reference
  • feature
    I2 C Interface and Control Registers
  • feature
    Low-Jitter Output Clocks May Be Directly Connected to an FPGA Serializer to Meet SMPTE SDI Jitter Specifications
  • feature
    Supports Cross-Locking of Input and Output Timing
  • feature
    Top of Frame (TOF) Pulse with Programmable Output Format Timing and Hi-Z Capability
  • feature
    Two Simultaneous LVDS Output Clocks with Selectable Frequencies and Hi-Z Capability: u2013 SD Clock: 27 MHz or 67.5 MHz u2013 HD Clock: 74.25 MHz, 74.25/1.001 MHz, 148.5 MHz or 148.5/1.001 MHz
  • feature
    Two reference ports (A and B) With H and V Sync Inputs
  • feature
    User-Defined Free Run Control Voltage Input


The LMH1982 device is a multi-rate video clock generator ideal for use in a wide range of 3-Gbps (3G), high-definition (HD), and standard-definition (SD) video applications, such as video synchronization, serial digital interface (SDI) serializer and deserializer (SerDes), video conversion, video editing, and other broadcast and professional video systems. The LMH1982 can generate two simultaneous SD and HD clocks and a Top of Frame (TOF) pulse. In genlock mode, the device's phase locked loops (PLLs) can synchronize the output signals to H sync and V sync input signals applied to either of the reference ports. The input reference can have analog timing from Texas Instrument's LMH1981 multi-format video sync separator or digital timing from an SDI deserializer and should conform to the major SD and HD standards. When a loss of reference occurs, the device can default to free run operation where the output timing accuracy will be determined by the external bias on the free run control voltage input. The LMH1982 can replace discrete PLLs and fieldprogrammable gate array (FPGA) PLLs with multiple voltage controlled crystal oscillators (VCXOs). Only one 27.0000 MHz VCXO and loop filter are externally required for genlock mode. The external loop filter as well as programmable PLL parameters can provide narrow loop bandwidths to minimize jitter transfer. HD clock output jitter as low as 40 ps peak-to-peak can help designers using FPGA SerDes meet stringent SDI output jitter specifications. The LMH1982 is offered in a space-saving 5 mm x 5 mm 32-pin WQFN package and provides low total power consumption of about 250 mW (typical).


Clock IC Type:
Clock Generator
No. of Outputs:
Supply Voltage Min:
Supply Voltage Max:
Clock IC Case Style:
No. of Pins:
Operating Temperature Min:
Operating Temperature Max:
Product Range:
Automotive Qualification Standard:
RoHS Phthalates Compliant:
MSL 1 - Unlimited
No SVHC (27-Jun-2018)

Alternate Descriptions

Avnet America

Clock Generator 32-Pin LLP EP T/R

Avnet America product

Avnet Europe

Clock Generator 32-Pin LLP EP T/R

Avnet Europe product

Texas Instruments

Multi-Rate Video Clock Generator with Genlock

Texas Instruments product