Datasheet > 逻辑 > 时钟驱动器> LMH1982

LMH1982

更新时间： 2024-11-19 11:07:51

品牌	Logo	应用领域
德州仪器 - TI		时钟驱动时钟驱动器时钟发生器
页数	文件大小	规格书
43页	1028K
描述
具有同步锁相的多速率视频时钟发生器

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LMH1982 数据手册

LMH1982

www.ti.com

SNLS289C –APRIL 2008–REVISED MARCH 2013

LMH1982 Multi-Rate Video Clock Generator with Genlock

Check for Samples: LMH1982

FEATURES

DESCRIPTION

The LMH1982 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.

•

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

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.

•

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

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.

•

User-Defined Free Run Control Voltage Input

I²C Interface and Control Registers

3.3V and 2.5V Supplies

APPLICATIONS

•

Video Genlock and Synchronization

FPGA SDI SerDes Recovered Clock

Generation

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).

•

Triple Rate 3G/HD/SD-SDI SerDes

Video Capture, Conversion, Editing and

Distribution

•

Video Displays and Projectors

Broadcast and Professional Video Equipment

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...43

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LMH1982 替代型号

型号	品牌	替代类型	描述	数据表
LMH1981	TI	功能相似	多格式视频同步分离器
LMH1980	TI	功能相似	自动检测 SD/HD/PC 视频同步分离器

与LMH1982相关器件

型号	品牌	获取价格	描述	数据表
LMH1982SQ	NSC	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQ/NOPB	TI	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQE	NSC	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQE/NOPB	TI	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQ-NOPB	TI	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQX	NSC	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQX/NOPB	TI	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1983	NSC	获取价格	Generating 44.1 kHz Based highly integrated programmable audio
LMH1983	TI	获取价格	具有音频时钟的 3G/高清/标清视频时钟发生器
LMH1983SQ	NSC	获取价格	暂无描述

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