Datasheet > AD721

AD721

更新时间： 2024-11-23 22:38:59

品牌	Logo	应用领域
亚德诺 - ADI		编码器
页数	文件大小	规格书
8页	148K
描述
RGB to NTSC/PAL Encoders

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中文翻译

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数据手册

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AD721 数据手册

RGB to NTSC/PAL Encoders

AD720/AD721

FEATURES

Com posite Video Output

(subcarrier amplitude and phase) signals in accordance with

either NT SC or PAL standards. T hese two outputs are also

combined to provide a composite video output. All three out-

puts are available separately at voltages of twice the standard

signal levels as required for driving 75 Ω reverse terminated

cables. T he AD721 also features a bypass mode, in which the

RGB inputs may bypass the encoder section of the IC via three

gain-of-two amplifiers suitable for driving 75 Ω reverse termi-

nated cables.

Chrom inance and Lum inance (S-Video) Outputs

No External Filters or Delay Lines Required

Drives 75 Ω Reverse-Term inated Loads

Com pact 28-Pin PLCC

Logic Selectable NTSC or PAL Encoding Modes

Autom atically Selects Proper Chrom inance Filter

Cutoff Frequency for Encoding Standard

Logic Selectable Encode or Pow er-Dow n Mode (AD720

Only)

T he AD720 and AD721 provide a complete, fully calibrated

function, requiring only termination resistors, bypass capacitors,

a clock input at four times the subcarrier frequency, and a com-

posite sync pulse. T here are two control inputs: one input

selects the T V standard (NT SC/PAL) and the other (ENCD)

powers down most sections of the chip when the encoding func-

tion is not in use (AD720) or activates the triple bypass buffer to

drive the RGB signals when RGB encoding is not required

(AD721). All logical inputs are CMOS compatible. T he chip

operates from ±5 V supplies.

Logic Selectable Encode or Bypass Mode (AD721 Only)

Low Pow er: 200 m W typical

APPLICATIONS

RGB to NTSC or PAL Encoding

Drive RGB Signals into 75 Ω Load (AD721 Only)

P RO D UCT D ESCRIP TIO N

T he AD720 and AD721 RGB to NT SC/PAL Encoders convert

red, green and blue color component signals into their corre-

sponding luminance (baseband amplitude) and chrominance

(continued on page 5)

FUNCTIO NAL BLO CK D IAGRAM

NTSC/PAL

ASNC

DELAYED C-SYNC

C-SYNC

DELAY

POWER AND GROUNDS

SYNC

DECODER

NTSC/PAL

LOGIC

+5V

C-SYNC

BURST

ANALOG

ANALOG ONLY

ANALOG

LOGIC

–5V

AGND

DGND

±180

SC 90

/270

NTSC/PAL

CLOCK

AT 8FSC

(PAL ONLY)

SC 90

4FSC

ENCD

QUADRATURE

DECODER

SC 0

BURST

5MHz

LUMINANCE OUTPUT*

–0.572V TO 1.43V NTSC

–0.6V TO 1.4V PAL

5MHz

4-POLE LP

SAMPLED-

DATA

DELAY LINE

2-POLE

LP POST-

FILTER

RESTORE

AND C-SYNC

INSERTION

RED

PRE-FILTER

COMPOSITE OUTPUT*

–0.572V TO 2V NTSC

–0.6V TO 2V PAL

RGB-TO-YUV

ENCODING

MATRIX

1.2MHz

4-POLE

LPF

NTSC/PAL

∑

GREEN

BLUE

3.6MHz (NTSC)

4.4MHz (PAL)

3-POLE LPF

BALANCED

MODULATORS

CHROMINANCE OUTPUT*

572mVp-p NTSC

600mVp-p PAL

∑

1.2MHz

4-POLE

LPF

*NOTE:

ROUT

1.5Vp-p

THE LUMINANCE, COMPOSITE, AND CHROMINANCE

OUTPUTS ARE AT TWICE NORMAL LEVELS FOR

DRIVING 75Ω REVERSE-TERMINATED LINES.

AD721

(ONLY)

GOUT

1.5Vp-p

BOUT

1.5Vp-p

REV. 0

Inform ation furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assum ed by Analog Devices for its

use, nor for any infringem ents of patents or other rights of third parties

which m ay result from its use. No license is granted by im plication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norw ood. MA 02062-9106, U.S.A.

Tel: 617/ 329-4700 Fax: 617/ 326-8703

12 3 4 5 6 7 8

中文翻译

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与AD721相关器件

型号	品牌	获取价格	描述	数据表
AD7216N2L	EMERSON-NETWORKPOWER	获取价格	Universal AC input
AD721JP	ADI	获取价格	RGB to NTSC/PAL Encoders
AD722	ADI	获取价格	RGB to NTSC/PAL Encoder
AD7224	ADI	获取价格	LC2MOS 8-Bit DAC with Output Amplifiers
AD7224BCHIPS	ROCHESTER	获取价格	D/A Converter
AD7224BQ	ADI	获取价格	LC2MOS 8-Bit DAC with Output Amplifiers
AD7224CE	ADI	获取价格	IC IC,D/A CONVERTER,SINGLE,8-BIT,BICMOS,LLCC,20PIN, Digital to Analog Converter
AD7224CQ	ADI	获取价格	LC2MOS 8-Bit DAC with Output Amplifiers
AD7224KCWN	ETC	获取价格	8-Bit Digital-to-Analog Converter
AD7224KN	ADI	获取价格	LC2MOS 8-Bit DAC with Output Amplifiers

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