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LMH1982SQX

更新时间： 2024-11-21 04:19:59

品牌	Logo	应用领域
美国国家半导体 - NSC		时钟驱动器时钟发生器逻辑集成电路
页数	文件大小	规格书
28页	504K
描述
Multi-Rate Video Clock Generator with Genlock

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中文翻译

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技术参数
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LMH1982SQX 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	LLP-32	Reach Compliance Code：	not_compliant
HTS代码：	8542.39.00.01	风险等级：	5.19
系列：	1982	输入调节：	STANDARD
JESD-30 代码：	S-XQCC-N32	JESD-609代码：	e0
长度：	5 mm	逻辑集成电路类型：	PLL BASED CLOCK DRIVER
湿度敏感等级：	1	功能数量：	1
反相输出次数：		端子数量：	32
实输出次数：	1	最高工作温度：	70 °C
最低工作温度：		输出特性：	3-STATE
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装形状：	SQUARE	封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
认证状态：	Not Qualified	座面最大高度：	0.8 mm
最大供电电压 (Vsup)：	3.6 V	最小供电电压 (Vsup)：	3 V
标称供电电压 (Vsup)：	3.3 V	表面贴装：	YES
温度等级：	COMMERCIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	QUAD	宽度：	5 mm
Base Number Matches：	1

LMH1982SQX 数据手册

PRELIMINARY

April 9, 2008

LMH1982

Multi-Rate Video Clock Generator with Genlock

General Description

Features

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

Top of Frame (TOF) pulse with programmable output

format timing and Hi-Z capability

■

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 out-

put signals to H sync and V sync input signals applied to either

of the reference ports. The input reference can have analog

timing from National's LMH1981 multi-format video sync sep-

arator 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.

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

■

The LMH1982 can replace discrete PLLs and field-pro-

grammable 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 serializers meet strin-

gent SDI output jitter specifications.

3.3V and 2.5V supplies

Applications

Video genlock and synchronization

■

Triple rate 3G/HD/SD-SDI SerDes

Video capture, conversion, editing and distribution

Video displays and projectors

Broadcast and professional video equipment

The LMH1982 is offered in a space-saving 5 mm x 5 mm 32-

pin LLP package and provides low total power dissipation of

250 mW (typical).

■

Typical System Block Diagram

30052410

300524

www.national.com

12 3 4 5 6 7...28

中文翻译

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与LMH1982SQX相关器件

型号	品牌	获取价格	描述	数据表
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
LMH1983SQ/NOPB	TI	获取价格	具有音频时钟的 3G/高清/标清视频时钟发生器 \| RTA \| 40 \| -40 to 8
LMH1983SQE/NOPB	TI	获取价格	具有音频时钟的 3G/高清/标清视频时钟发生器 \| RTA \| 40 \| -40 to 8
LMH1983SQX	NSC	获取价格	IC VIDEO CLOCK GENERATOR, QCC40, 6 X 6 MM, LLP-40, Clock Generator
LMH1983SQX/NOPB	TI	获取价格	具有音频时钟的 3G/高清/标清视频时钟发生器 \| RTA \| 40 \| -40 to 8
LMH2	CREE	获取价格	LMH2 LED Modules Family
LMH2100	NSC	获取价格	50 MHz to 4 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA

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