Two Simultaneous LVDS Output Clocks with Selectable Frequencies and Hi-Z Capability:
SD Clock: 27 MHz or 67.5 MHz
HD Clock: 74.25 MHz, 74.25/1.001 MHz, 148.5 MHz or 148.5/1.001 MHz
Low-Jitter Output Clocks May Be Directly Connected to an FPGA Serializer to Meet SMPTE SDI Jitter Specifications
Top of Frame (TOF) Pulse with Programmable Output Format Timing and Hi-Z Capability
Two reference ports (A and B) With H and V Sync Inputs
Supports Cross-Locking of Input and Output Timing
External Loop Filter Allows Control of Loop Bandwidth, Jitter Transfer, and Lock Time Characteristics
Free Run or Holdover Operation on Loss of Reference
User-Defined Free Run Control Voltage Input
I2C Interface and Control Registers
3.3-V and 2.5-V Supplies
Description for the LMH1982
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 field-programmable 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 × 5 mm 32-pin WQFN package and provides low total power consumption of about 250 mW (typical).
Added to cart
Email notification is enabled.
Select a carrier option
NEW - You can choose different carrier options based on the quantity of parts, including full reel, custom reel, cut tape, tube or tray.
A custom reel
is a continuous length of cut tape from one reel to maintain lot- and date-code traceability, built to the exact quantity requested. Following industry standards, a brass shim connects an 18-inch leader and trailer on both sides of the cut tape for direct feeding into automated assembly machines. TI includes a reeling fee for custom reel orders.
Cut tape is a length of tape cut from a reel. TI may fulfill orders using multiple strips of cut tapes or boxes to satisfy the quantity requested.TI often ships
devices inside a box or in the tube or tray, depending on inventory availability. We pack all tapes, tubes or sample boxes according to internal electrostatic discharge and moisture-sensitivity-level protection requirements.
Select date code requirements
Ship to and currency selection
Please select your region and currency to update your cart. You will be able to select payment methods, importation responsibility and tax liability during the checkout process.
If you would like for TI to manage importation, be responsible for tariffs and customs clearance procedures, as well as receive a cash receipt with VAT charge, change your selection to KRW currency.
TI가 수입을 관리하고 관세와 통관 절차를 담당하며 부가세 청구가 포함된 현금 영수증을 받기를 원하는 경우 선택 항목을 KRW 통화로 변경하십시오.