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).

• 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

• Function
• Clock generator
• Number of outputs
• 2
• Output frequency (Max) (MHz)
• 148.5
• Core supply voltage (V)
• 2.5, 3.3
• Output supply voltage (V)
• 2.5, 3.3
• Input type
• LVCMOS
• Output type
• LVDS
• Operating temperature range (C)
• 0 to 70
• Features
• Multi-rate video clock generator with Genlock
• Rating
• Catalog

LMH1982的完整型号有：LMH1982SQ/NOPB、LMH1982SQE/NOPB、LMH1982SQX/NOPB，以下是这些产品的关键参数及官网采购报价：

LMH1982SQ/NOPB，工作温度：0 to 70，封装：WQFN (RTV)-32，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMH1982SQ/NOPB的批量USD价格：15.816（1000+）

LMH1982SQE/NOPB，工作温度：0 to 70，封装：WQFN (RTV)-32，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMH1982SQE/NOPB的批量USD价格：15.816（1000+）

LMH1982SQX/NOPB，工作温度：0 to 70，封装：WQFN (RTV)-32，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMH1982SQX/NOPB的批量USD价格：13.816（1000+）

LMH1982SQEEVAL — 具有 LMH1981 HD/SD 视频同步分离器的 LMH1982 多速率视频时钟发生器 EVM

The LMH1982 evaluation board platform was designed by National Semiconductor to demonstrate the excellent clock jitter performance of the LMH1982 multi-rate video clock and timing generator in a genlock application with the LMH1981 multi-format video sync separator. The evaluation platform consists (...)

LMH1982APP-SW — LMH1982 软件设置 - 具有同步锁相的多速率视频时钟发生器

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助?PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)