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TI LM1881 视频同步分离器 TI LM1881 是一款视频同步分离器，能够从标准的负极性同步 NTSC、PAL 和 SECAM 视频信号中提取 timing 信息，包括复合同步、垂直同步、burst timing 和奇偶字段信息。该芯片具有高输入阻抗 (>10kΩ) 和低功耗 (<10mA) 的特点，适用于视频摄像机、广播系统、机顶盒、家用娱乐设备和计算机游戏应用等领域。 1. 特点： * AC 耦合复合输入信号 * 高输入阻抗 (>10kΩ) * 低功耗 (<10mA) * 提取 timing 信息，包括复合同步、垂直同步、burst timing 和奇偶字段信息 * 支持标准和非标准视频信号 * 内置奇偶字段输出和burst 门控输出 * 垂直输出默认触发和延迟触发模式 2. 应用： * 视频摄像机 * 广播系统 * 机顶盒 * 家用娱乐设备 * 计算机游戏应用 3. Pin 配置： * 8 引脚 SOIC 或 PDIP 封装 * 输入引脚：VIN (复合视频输入) * 输出引脚：VS (垂直同步输出)、OE (奇偶字段输出)、BG (burst 门控输出) 4. 工作原理： * LM1881_videosync_separator 工作流程可以分为三个阶段：输入信号处理、同步检测和输出生成 * 输入信号处理阶段，LM1881 使用高输入阻抗 (>10kΩ) 的输入 stage 来提高输入信号的抗干扰能力 * 同步检测阶段，LM1881 使用专门的同步检测电路来检测输入信号中的同步信息 * 输出生成阶段，LM1881 根据检测到的同步信息生成对应的输出信号，包括垂直同步输出、奇偶字段输出和burst 门控输出 5. 重要注意事项： * 在使用 LM1881 之前，请阅读 datasheet 中的重要注意事项部分，以了解产品的使用限制和注意事项 * LM1881 不适用于安全关键应用，请在使用前进行充分的测试和验证 6. Functional Block Diagram： * LM1881 的功能块图揭示了芯片的内部结构，包括输入 stage、同步检测电路、输出生成电路和控制逻辑电路 * 该图表明了 LM1881 的工作原理和内部实现机理 7.Conclusion： * LM1881 是一款功能强大、低功耗的视频同步分离器，适用于广泛的视频应用场景 * 通过 LM1881，可以实现视频信号的同步分离、视频信号的处理和视频输出的生成 * 在设计和使用 LM1881 时，请务必阅读 datasheet 并遵守相关的使用限制和注意事项

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LM1881

SNLS384G –FEBRUARY 1995–REVISED JUNE 2015

LM1881 Video Sync Separator

1 Features 3 Description

The LM1881 Video sync separator extracts timing

• AC Coupled Composite Input Signal

information including composite and vertical sync,

• >10-kΩ Input Resistance

burst or back porch timing, and odd and even field

• <10-mA Power Supply Drain Current

information from standard negative going sync NTSC,

PAL

(1)

and SECAM video signals with amplitude from

• Composite Sync and Vertical Outputs

0.5-V to 2-V p-p. The integrated circuit is also

• Odd and Even Field Output

capable of providing sync separation for non-

• Burst Gate or Back Porch Output

standard, faster horizontal rate video signals. The

vertical output is produced on the rising edge of the

• Horizontal Scan Rates to 150 kHz

first serration in the vertical sync period. A default

• Edge Triggered Vertical Output

vertical output is produced after a time delay if the

• Default Triggered Vertical Output for Non-

rising edge mentioned above does not occur within

Standard Video Signal (Video Games-Home

the externally set delay period, such as might be the

Computers)

case for a non-standard video signal.

2 Applications

Device Information

(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

• Video Cameras and Recorders

SOIC (8) 4.90 mm × 3.91 mm

• Broadcasting Systems

LM1881

PDIP (8) 9.81 mm × 6.35 mm

• Set-Top Boxes

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

• Home Entertainment

the end of the data sheet.

• Computing and Gaming Applications

(1) PAL in this datasheet refers to European broadcast TV

standard “Phase Alternating Line”, and not to Programmable

Array Logic.

Typical Connection Diagram

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.

LM1881

SNLS384G –FEBRUARY 1995–REVISED JUNE 2015

www.ti.com

Table of Contents

7.2 Functional Block Diagram ......................................... 6

1 Features.................................................................. 1

7.3 Feature Description................................................... 7

2 Applications ........................................................... 1

7.4 Device Functional Modes........................................ 10

3 Description ............................................................. 1

8 Application and Implementation ........................ 11

4 Revision History..................................................... 2

8.1 Application Information............................................ 11

5 Pin Configuration and Functions......................... 3

8.2 Typical Applications ................................................ 11

6 Specifications......................................................... 3

9 Power Supply Recommendations...................... 13

6.1 Absolute Maximum Ratings ...................................... 3

10 Device and Documentation Support ................. 14

6.2 ESD Ratings.............................................................. 4

10.1 Community Resources.......................................... 14

6.3 Recommended Operating Conditions....................... 4

10.2 Trademarks ........................................................... 14

6.4 Electrical Characteristics LM1881............................. 4

10.3 Electrostatic Discharge Caution............................ 14

6.5 Dissipation Ratings ................................................... 4

10.4 Glossary ................................................................ 14

6.6 Typical Characteristics.............................................. 5

11 Mechanical, Packaging, and Orderable

7 Detailed Description.............................................. 6

Information ........................................................... 14

7.1 Overview ................................................................... 6

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision F (March 2013) to Revision G Page

• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional

Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device

and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1

Changes from Revision E (March 2013) to Revision F Page

• Changed layout of National Data Sheet to TI format ........................................................................................................... 13

Product Folder Links: LM1881

LM1881

SNLS384G –FEBRUARY 1995–REVISED JUNE 2015

www.ti.com

6.2 ESD Ratings

VALUE UNIT

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001

(1)

±2000

(ESD)

Electrostatic discharge V

Machine Model ±200

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

Operating free-air temperature 0 70 °C

6.4 Electrical Characteristics LM1881

= 5 V; R

SET

= 680 kΩ; T

= 0°C to +70°C by correlation with 100% electrical testing at T

=25°C

PARAMETER TEST CONDITIONS MIN TYP

(1)

MAX UNIT

Supply Current Outputs at V

= 5 V 5.2 10

Logic 1

= 12 V 5.5 12

DC Input Voltage Pin 2 1.3 1.5 1.8 V

Input Threshold Voltage See

(2)

55 70 85 mV

Input Discharge Current Pin 2; V

= 2 V 6 11 16 µA

Input Clamp Charge Current Pin 2; V

= 1 V 0.2 0.8 mA

SET

Pin Reference Voltage Pin 6;

(3)

1.1 1.22 1.35 V

Composite Sync. & Vertical I

OUT

= 40 µA; V

= 5 V 4.0 4.5

Outputs Logic 1

= 12 V 11

OUT

= 1.6 mA V

= 5 V 2.4 3.6

Logic 1

= 12 V 10

Burst Gate and Odd and Even I

OUT

= 40 µA; V

= 5 V 4 4.5

Outputs Logic 1

= 12 V 11

Composite Sync. Output I

OUT

= −1.6 mA; Logic 0; Pin 1 0.2 0.8 V

Vertical Sync. Output I

OUT

= −1.6 mA; Logic 0; Pin 3 0.2 0.8 V

Burst Gate Output I

OUT

= −1.6 mA; Logic 0; Pin 5 0.2 0.8 V

Odd and Even Output I

OUT

= −1.6 mA; Logic 0; Pin 7 0.2 0.8 V

Vertical Sync Width 190 230 300 µs

Burst Gate Width 2.7 kΩ from Pin 5 to V

2.5 4 4.7 µs

Vertical Default Time See

(4)

32 65 90 µs

(1) Typicals are at T

= 25°C and represent the most likely parametric norm.

(2) Relative difference between the input clamp voltage and the minimum input voltage which produces a horizontal output pulse.

(3) Careful attention should be made to prevent parasitic capacitance coupling from any output pin (Pins 1, 3, 5 and 7) to the R

SET

pin (Pin

6).

(4) Delay time between the start of vertical sync (at input) and the vertical output pulse.

6.5 Dissipation Ratings

MIN MAX UNIT

Package Dissipation

(1)

1100 mW

(1) For operation in ambient temperatures above 25°C, the device must be derated based on a 150°C maximum junction temperature and a

package thermal resistance of 110°C/W, junction to ambient.

Product Folder Links: LM1881

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