Datasheet > LMH1983

LMH1983

更新时间： 2023-09-03 20:35:53

品牌	Logo	应用领域
德州仪器 - TI		时钟时钟发生器
页数	文件大小	规格书
55页	1943K
描述
具有音频时钟的 3G/高清/标清视频时钟发生器

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LMH1983

SNLS309I –APRIL 2010–REVISED DECEMBER 2014

LMH1983 3G/HD/SD Video Clock Generator with Audio Clock

1 Features

3 Description

The LMH1983 is a highly-integrated programmable

•

Four PLLs for Simultaneous A/V Clock Generation

audio/video (A/V) clock generator intended for

broadcast and professional applications. It can

replace multiple PLLs and VCXOs used in

applications supporting SMPTE serial digital video

(SDI) and digital audio AES3/EBU standards. It offers

low-jitter reference clocks for any SDI transmitter to

meet stringent output jitter specifications without

additional clock cleaning circuits.

–

PLL1: 27 or 13.5 MHz

PLL2: 148.5 or 74.25 MHz

PLL3: 148.5/1.001 or 74.25/1.001 MHz

PLL4: 98.304 MHz / 2^X(X = 0 to 15)

•

3 x 2 Video Clock Crosspoint

Flexible PLL Bandwidth to Optimize Jitter

Performance and Lock Time

The LMH1983 features automatic input format

detection, simple programming of multiple A/V output

formats, genlock or digital free-run modes, and

override programmability of various automatic

functions. The recognized input formats include HVF

syncs for the major video standards, 27 MHz, 10

MHz, and 32/44.1/48/96 kHz audio word clocks.

•

Soft Resynchronization to New Reference

Digital Holdover or Free-run on Loss of Reference

Status Flags for Loss of Reference and Loss of

PLL Lock

•

3.3 V Single Supply Operation

I²C Interface with Address Select Pin (3 States)

The dual-stage PLL architecture integrates four PLLs

with three on-chip VCOs. The first stage (PLL1) uses

an external low-noise 27 MHz VCXO with narrow

loop bandwidth to provide a clean reference clock for

the next stage. The second stage (PLL2, 3, 4)

consists of three parallel VCO PLLs for simultaneous

generation of the major digital A/V clock fundamental

rates, including 148.5 MHz, 148.5/1.001 MHz, and

98.304 MHz (4 × 24.576 MHz). Each PLL can

generate a clock and a timing pulse to indicate top of

frame (TOF).

2 Applications

•

Triple Rate (3G/HD/SD) SDI SerDes

FPGA Reference Clock Generation/Cleaning

Audio Embed or De-embed

Video Cameras

Frame Synchronizers (Genlock, DARS)

A-D or D-A Conversion, Editing, Processing Cards

Keyers and Logo Inserters

Device Information⁽¹⁾

Format or Standards Converters

Video Displays and Projectors

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LMH1983

WQFN (40)

6.00 mm × 6.00 mm

A/V Test and Measurement Equipment

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Typical Application Block Diagram

LOOP

FILTER

27 MHz

VCXO

27 MHz (PLL1)

525i

Analog

ref. in

H sync

V sync

F sync

CLKout1

29.97 Hz (TOF1)

525i/29.97 SDI out

+ embedded audio

LMH1981

Sync

Separator

Hin

Vin

Fin

148.5 MHz (PLL2)

29.97 Hz (TOF2)

CLKout2

CLKout3

FPGA

1080p/59.94 SDI out

+ embedded audio

A/V Frame Sync with

Downconverter,

LMH1983

148.35 MHz (PLL3)

59.94 Hz (TOF3)

Audio Embedder and

De-embedder

1080p/59.94 SDI in

+ embedded audio

24.576 MHz (PLL4)

5.994 Hz

CLKout4

Genlocked to video ref. in

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...55

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LMH1983 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
LMP7711	TI	功能相似	Single and Dual Precision, 17 MHz, Low Noise, CMOS Input Amplifiers

与LMH1983相关器件

型号	品牌	获取价格	描述	数据表
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
LMH2100	TI	获取价格	用于 CDMA 和 WCDMA 的 50MHz 至 4GHz 40dB 对数功率检测器
LMH2100TM	NSC	获取价格	50 MHz to 4 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA
LMH2100TM/NOPB	TI	获取价格	用于 CDMA 和 WCDMA 的 50MHz 至 4GHz 40dB 对数功率检测器 \|

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