Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Video editing Video sync TSSOP 14

EXT

GND

CC1

GND

CC2

HSOUT

OEOUT

BPOUT

CSOUT

CC3

GND

VFOUT

VSOUT

LMH1981

www.ti.com

SNLS214H –APRIL 2006–REVISED MARCH 2013

LMH1981 Multi-Format Video Sync Separator

Check for Samples: LMH1981

FEATURES

DESCRIPTION

The LMH1981 is a high performance multi-format

• Standard Analog Video Sync Separation for

sync separator ideal for use in a wide range of video

NTSC, PAL, 480I/P, 576I/P, 720P, and

applications, such as broadcast and professional

1080I/P/PsF from Composite Video (CVBS),

video equipment and HDTV/DTV systems.

S-Video (Y/C), and Component Video

The input accepts standard analog SD/ED/HD video

(YP

/GBR) Interfaces

signals with either bi-level or tri-level sync, and the

• Bi-Level & Tri-Level Sync Compatible

outputs provide all of the critical timing signals in

• Composite, Horizontal, and Vertical Sync

CMOS logic, which swing from rail-to-rail (V

and

Outputs

GND) including Composite, Horizontal, and Vertical

Syncs, Burst/Back Porch Timing, Odd/Even Field,

• Burst/Back Porch Timing, Odd/Even Field, and

and Video Format Outputs. HSync features very low

Video Format Outputs

jitter on its leading (falling) edge, minimizing external

• Superior Jitter Performance on Leading Edge

circuitry needed to clean and reduce jitter in

of HSync

subsequent clock generation stages.

• Automatic Video Format Detection

The LMH1981 automatically detects the input video

• 50% Sync Slicing for Video Inputs from 0.5 V

format, eliminating the need for programming using a

to 2 V

microcontroller, and applies precise 50% sync slicing

to ensure accurate sync extraction at O

, even for

• 3.3V to 5V Supply Operation

inputs with irregular amplitude from improper

termination or transmission loss. Its unique Video

APPLICATIONS

Format Output conveys the total horizontal line count

• Broadcast and Professional Video Equipment

per field as an 11-bit binary serial data stream, which

can be decoded by the video system to determine the

• HDTV/DTV Systems

input video format and enable dynamic adjustment of

• Genlock Circuits

system parameters, i.e.: color space or scaler

• Video Capture Devices

conversions. The LMH1981 is available in a 14-pin

• Set-Top Boxes (STB) & Digital Video

TSSOP package and operates over a temperature

range of −40°C to +85°C.

Recorders (DVR)

• Video Displays

Connection Diagram

Figure 1. 14-Pin TSSOP - Top View

See PW Package

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.

2All 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.

Summary of content (24 pages)

PAGE 1
LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 LMH1981 Multi-Format Video Sync Separator Check for Samples: LMH1981 FEATURES DESCRIPTION • The LMH1981 is a high performance multi-format sync separator ideal for use in a wide range of video applications, such as broadcast and professional video equipment and HDTV/DTV systems.
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LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com PIN DESCRIPTIONS Pin No. Pin Name Pin Description 1 REXT Bias Current External Resistor 2, 5, 10 GND Ground 3, 6, 11 VCC Supply Voltage 4 VIN Video Input 7 HSOUT Horizontal Sync Output 8 VSOUT Vertical Sync Output 9 VFOUT Video Format Output 12 CSOUT Composite Sync Output 13 BPOUT Burst/Back Porch Timing Output 14 OEOUT Odd/Even Field Output These devices have limited built-in ESD protection.
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C, VCC = VCC1 = VCC2 = VCC3 = 3.3V, REXT = 10 kΩ 1%, RL = 10 kΩ, CL < 10 pF.Boldface limits apply at the temperature extremes. See Figure 2. Symbol ICC Parameter Supply Current Conditions No input signal Min (2) Typ (3) Max (2) VCC = 3.3V 9.5 11.5 VCC = 5V 11 13.
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LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com LMH1981 Test Circuit 1 REXT 10 k:, 1% + C4 4.7 PF 2 C1 0.1 PF 3 VCC CVBS/Y/G VIDEO INPUT CIN 1 PF RT 75: 5 C2 0.1 PF 6 VCC HORIZONTAL SYNC OUTPUT 4 RS 7 REXT OEOUT GND BPOUT CSOUT VCC1 LMH1981 VIN VCC3 GND GND VCC2 VFOUT HSOUT VSOUT 14 RS 13 RS 12 RS 11 8 BURST/BACK PORCH TIMING OUTPUT COMPOSITE SYNC OUTPUT VCC C3 0.
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 SDTV Vertical Interval Timing (NTSC, PAL, 480I, 576I) START OF FIELD 1 3H 3H H H 3H VERTICAL SYNC SERRATION COLOR BURST ½H VIN LINE # 525 1 2 3 4 5 6 7 8 9 10 11 CSOUT HSOUT BPOUT TVSOUT = 3H VSOUT OEOUT ODD FIELD Figure 3.
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LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com EDTV Vertical Interval Timing (480P, 576P) START OF FRAME 6H 6H H H VERTICAL SYNC SERRATION | VIN 525 1 6 | LINE # 7 8 9 10 11 12 13 14 26 (42) 27 (43) CSOUT | HSOUT | BPOUT | TVSOUT = 3H VSOUT | OEOUT LOGIC HIGH FOR PROGRESSIVE VIDEO FORMATS OEOUT Figure 5. 480P Vertical Interval HDTV Vertical Interval Timing (720P, 1080P) START OF FRAME 20H (36H) H | VIN 750 (1125) 1 3 2 4 5 6 7 8...
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 HDTV Vertical Interval Timing (1080I) START OF FIELD 1 15H VERTICAL SYNC SERRATION H ½H | VIN 1125 1 2 3 4 5 6 7 20 21 22 584 585 586 | LINE # CSOUT | HSOUT | BPOUT OEOUT FIELD 1 | TVSOUT = 3H | VSOUT Figure 7. 1080I Field 1 Vertical Interval ½H START OF FIELD 2 5H 15H | VIN LINE # 563 564 565 566 567 568 569 570... 583 | CSOUT | HSOUT | BPOUT TVSOUT = 3H OEOUT FIELD 2 | VSOUT | Figure 8.
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LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com SD/EDTV Horizontal Interval Timing WHITE LEVEL VIDEO INPUT RANGE 0.5 VPP to 2 VPP VIDEO 1 VPP (typ.) VIN NTSC/PAL COLOR BURST ENVELOPE OH BLANKING LEVEL SYNC 50% SLICE SYNC TIP LEVEL CSOUT tdCSOUT HSOUT tdHSOUT THSOUT BPOUT tdBPOUT TBPOUT Figure 9.
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 Table 1.
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LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com Table 3.
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 APPLICATION INFORMATION GENERAL DESCRIPTION The LMH1981 is designed to extract the timing information from various video formats with vertical serration and output the syncs and relevant timing signals in CMOS logic. Its high performance, advanced features and easy application make it ideal for broadcast and professional video systems where low jitter is a crucial parameter. The device can operate from a supply voltage between 3.3V and 5V.
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LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com Input Termination The video source should be load terminated with a 75Ω resistor to ensure correct video signal amplitude and minimize signal distortion due to reflections. In extreme cases, the LMH1981 can handle unterminated or doubleterminated input conditions, assuming 1 VPP signal amplitude for normal terminated video.
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 HSYNC JITTER (PSPP) 2500 2000 1500 PAL 1000 500 1080I 0 0 2 4 6 CIN (PF) 8 10 Figure 11. Typical HSync Jitter vs. CIN Values Sync Lock Time In addition to settling time, the LMH1981 has a predetermined sync lock time, TSYNC-LOCK, before the outputs are correct.
PAGE 14
LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com LOGIC OUTPUTS In the absence of a video input signal, the LMH1981 outputs are logic high except for the odd/even field and video format outputs, which are both undefined, and the composite sync output. Composite Sync Output CSOUT (pin 12) simply reproduces the video input sync pulses below the video blanking level.
PAGE 15
LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 For SDTV formats, the back porch pulse's negative-going leading edge is derived from the input's positive-going sync edge with a propagation delay, and the pulse width spans an appropriate duration of the color burst envelope for NTSC/PAL. During the vertical interval, its pulse width is shorter to correspond with the narrow serration pulses.
PAGE 16
LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com 11H VIN LINE # 9 11 10 12 13 14 15 16 17 18 19 20 21 0 1 0 22 CSOUT HSOUT (CLOCK) 3rd HSync after VSync leading edge VSOUT 11- BIT BINARY DATA STREAM VFOUT (DATA) 0 0 1 START 0 0 0 0 1 01000001010b = 522 HORIZONTAL LINES PER FIELD END Figure 15.
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LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 11H VIN LINE# 567 566 568 569 570 571 572 573 574 575 576 577 1 1 1 578 CSOUT HSOUT (CLOCK) 3rd HSync after VSync leading edge VSOUT 11-BIT BINARY DATA STREAM VFOUT (DATA) 0 1 START 0 0 0 1 0 1 01000101111b = 559 HORIZONTAL LINES PER FIELD END Figure 17.
PAGE 18
LMH1981 SNLS214H – APRIL 2006 – REVISED MARCH 2013 www.ti.com For example, a significant decrease in APL such as a white-to-black field transition will cause a positive-going shift in the sync tips characterized by the source’s RC time constant, tRC-OUT (150Ω*COUT). The LMH1981’s input clamp circuitry may have difficulty stabilizing the input signal under this type of shifting; consequently, the unstable signal at VIN may cause missing sync output pulses to result, unless a proper value for CIN is chosen.
PAGE 19
LMH1981 www.ti.com SNLS214H – APRIL 2006 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision G (March 2013) to Revision H • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMH1981MTX/NOPB Package Package Pins Type Drawing TSSOP PW 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.95 B0 (mm) K0 (mm) P1 (mm) 8.3 1.6 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH1981MTX/NOPB TSSOP PW 14 2500 367.0 367.0 35.
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