TI-LMH1981.pdf资源-CSDN文库

R

EXT

GND

V

CC1

V

IN

GND

V

CC2

HSOUT

OEOUT

BPOUT

CSOUT

V

CC3

GND

VFOUT

VSOUT

LMH1981

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LMH1981

www.ti.com

SNLS214H –APRIL 2006–REVISED MARCH 2013

LMH1981 Multi-Format Video Sync Separator

Check for Samples: LMH1981

1

FEATURES

DESCRIPTION

The LMH1981 is a high performance multi-format

2

• 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

B

P

R

/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

CC

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

PP

format, eliminating the need for programming using a

to 2 V

PP

microcontroller, and applies precise 50% sync slicing

to ensure accurate sync extraction at O

H

, 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

1

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.

LMH1981

SNLS214H –APRIL 2006–REVISED MARCH 2013

www.ti.com

PIN DESCRIPTIONS

Pin No. Pin Name Pin Description

1 R

EXT

Bias Current External Resistor

2, 5, 10 GND Ground

3, 6, 11 V

CC

Supply Voltage

4 V

IN

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. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1)(2)(3)

ESD Tolerance

(4)

Human Body Model 3.5 kV

Machine Model 350V

Charge-Device Model 1.0 kV

Supply Voltage, V

CC

0V to 5.5V

Video Input, V

IN

−0.3V to V

CC

+ 0.3V

Storage Temperature Range −65°C to +150°C

Lead Temperature (soldering 10 sec.) 300°C

Junction Temperature (T

JMAX

)

(5)

+150°C

Thermal Resistance (θ

JA

) 52°C/W

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but specific performance is not ensured. For ensured specifications and the test

conditions, see the Electrical Characteristics Tables.

(2) All voltages are measured with respect to GND, unless otherwise specified.

(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(4) Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of

JEDEC)Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).

(5) The maximum power dissipation is a function of T

J(MAX)

, θ

JA

. The maximum allowable power dissipation at any ambient temperature is

P

D

= (T

J(MAX)

- T

A

)/θ

JA

. All numbers apply for packages soldered directly onto a PC board.

Operating Ratings

(1)

Temperature Range

(2)

−40°C to +85°C

V

CC

3.3V −5% to 5V +5%

Input Amplitude, V

IN-AMPL

140 mV to V

CC

–V

IN-CLAMP

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but specific performance is not ensured. For ensured specifications and the test

conditions, see the Electrical Characteristics Tables.

(2) The maximum power dissipation is a function of T

J(MAX)

, θ

JA

. The maximum allowable power dissipation at any ambient temperature is

P

D

= (T

J(MAX)

- T

A

)/θ

JA

. All numbers apply for packages soldered directly onto a PC board.

Product Folder Links: LMH1981

LMH1981

www.ti.com

SNLS214H –APRIL 2006–REVISED MARCH 2013

Electrical Characteristics

(1)

Unless otherwise specified, all limits are ensured for T

A

= 25°C, V

CC

= V

CC1

= V

CC2

= V

CC3

= 3.3V, R

EXT

= 10 kΩ 1%,

R

L

= 10 kΩ, C

L

< 10 pF.Boldface limits apply at the temperature extremes. See Figure 2.

Symbol Parameter Conditions Min

(2)

Typ

(3)

Max

(2)

Units

I

CC

Supply Current No input signal V

CC

= 3.3V 9.5 11.5

mA

V

CC

= 5V 11 13.5

Video Input Specifications

V

IN-SYNC

Input Sync Amplitude Amplitude from negative sync tip to video 0.14 0.30 0.60

blanking level for SD/EDTV bi-level sync

(4)(5)(6)

V

PP

Amplitude from negative to positive sync tips 0.30 0.60 1.20

for HDTV tri-level sync

(4)(7)(6)

V

IN-CLAMP

Input Sync Tip Clamp Level 0.7 V

V

IN-SLICE

Input Sync Slice Level Level between video blanking & sync tip for 50 %

SD/EDTV and between negative & positive

sync tips for HDTV

Logic Output Specifications

(8)

V

OL

Output Logic 0 See output load conditions V

CC

= 3.3V 0.3

V

above

V

CC

= 5V 0.5

V

OH

Output Logic 1 See output load conditions V

CC

= 3.3V 3.0

V

above

V

CC

= 5V 4.5

T

SYNC-LOCK

Sync Lock Time Time for the output signals to be correct after 2 V

the video signal settles at V

IN

following a periods

significant input change. See START-UP

TIME for more information

T

VSOUT

Vertical Sync Output Pulse See Figure 3, Figure 4, Figure 5, Figure 6, 3 H

Width Figure 7, and Figure 8 for SDTV, EDTV & periods

HDTV Vertical Interval Timing

(1) Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very

limited self-heating of the device such that T

J

= T

A

. No ensured specification of parametric performance is indicated in the electrical

tables under conditions of internal self-heating where T

J

> T

A

.

(2) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using the

Statistical Quality Control (SQC) method.

(3) Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and

will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped production

material.

(4) V

IN-AMPL

plus V

IN-CLAMP

should not exceed V

CC

.

(5) Tested with 480I signal.

(6) Maximum voltage offset between 2 consecutive input horizontal sync tips must be less than 25 mV

PP

.

(7) Tested with 720P signal.

(8) Outputs are negative-polarity logic signal, except for odd/even field and video format outputs.

Product Folder Links: LMH1981

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