AD724

更新时间： 2024-02-06 17:57:50

品牌	Logo	应用领域
亚德诺 - ADI		编码器
页数	文件大小	规格书
15页	209K
描述
RGB to NTSC/PAL Encoder

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中文翻译

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技术参数
数据手册

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AD724 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP16,.4	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.1
Is Samacsys：	N	商用集成电路类型：	COLOR SIGNAL ENCODER
输入类型：	RGB	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e3	长度：	10.3 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	16	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	5 V
认证状态：	Not Qualified	座面最大高度：	2.65 mm
子类别：	Color Signal Converters	最大压摆率：	42 mA
最大供电电压 (Vsup)：	5.25 V	最小供电电压 (Vsup)：	4.75 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
视频标准：	PAL; NTSC	宽度：	7.5 mm
Base Number Matches：	1

AD724 数据手册

RGB to NTSC/PAL Encoder

AD724

FEATURES

Low Cost, Integrated Solution

+5 V Operation

operates from a single +5 V supply. No external delay lines or

filters are required. The AD724 may be powered down when

not in use.

Accepts FSC Clock or Crystal, or 4FSC Clock

Composite Video and Separate Y/C (S-Video) Outputs

Luma and Chroma Outputs Are Time Aligned

Minimal External Components:

No External Filters or Delay Lines Required

Onboard DC Clamp

The AD724 accepts either FSC or 4FSC clock. When a clock is

not available, a low cost parallel-resonant crystal (3.58 MHz

(NTSC) or 4.43 MHz (PAL)) and the AD724’s on-chip oscilla-

tor generate the necessary subcarrier clock. The AD724 also

accepts the subcarrier clock from an external video source.

The interface to graphics controllers is simple: an on-chip logic

“XNOR” accepts the available vertical (VSYNC) and horizon-

tal sync (HSYNC) signals and creates the composite sync

(CSYNC) signal on-chip. If available, the AD724 will also

accept a standard CSYNC signal by connecting VSYNC to

Logic HI and applying CSYNC to the HSYNC pin. The

AD724 contains decoding logic to identify valid horizontal sync

pulses for correct burst insertion.

Accepts Either HSYNC and VSYNC or CSYNC

Phase Lock to External Subcarrier

Drives 75 ⍀ Reverse-Terminated Loads

Logic Selectable NTSC or PAL Encoding Modes

Compact 16-Lead SOIC

APPLICATIONS

RGB to NTSC or PAL Encoding

Delays in the U and V chroma filters are matched by an on-chip

sampled-data delay line in the Y signal path. To prevent alias-

ing, a prefilter at 5 MHz is included ahead of the delay line and

a post-filter at 5 MHz is added after the delay line to suppress

harmonics in the output. These low-pass filters are optimized

for minimum pulse overshoot. The overall luma delay, relative

to chroma, has been designed to be time aligned for direct input to

a television’s baseband. The AD724 comes in a space-saving

SOIC and is specified for the 0°C to +70°C commercial tem-

perature range.

PRODUCT DESCRIPTION

The AD724 is a low cost RGB to NTSC/PAL Encoder that

converts red, green and blue color component signals into their

corresponding luminance (baseband amplitude) and chromi-

nance (subcarrier amplitude and phase) signals in accordance

with either NTSC or PAL standards. These two outputs are also

combined to provide composite video output. All three outputs can

simultaneously drive 75 Ω, reverse-terminated cables. All logi-

cal inputs are TTL, 3 V and 5 V CMOS compatible. The chip

FUNCTIONAL BLOCK DIAGRAM

PHASE

DETECTOR

FSC

LOOP

FILTER

4FSC

VCO

CHARGE

PUMP

SUB-

CARRIER

XOSC

SYNC

4FSC

FSC

CSYNC

BURST

NTSC/PAL

HSYNC

SEPARATOR

NTSC/PAL

XNOR

VSYNC

CSYNC

±180°

(PAL ONLY)

SC 90°/270°

FSC 90

FSC 0

QUADRATURE

DECODER

4FSC

CLOCK

AT 8FSC

CSYNC

2-POLE

LP POST-

FILTER

3-POLE

LP PRE-

FILTER

SAMPLED-

DATA

DELAY LINE

CLAMP

LUMINANCE

OUTPUT

RED

GREEN

BLUE

COMPOSITE

OUTPUT

NTSC/PAL

RGB-TO-YUV

ENCODING

MATRIX

CLAMP

4-POLE

LPF

CLAMP

4-POLE

LPF

BALANCED

MODULATORS

CHROMINANCE

OUTPUT

CLAMP

4-POLE

LPF

CLAMP

BURST

REV. B

Information furnished by Analog Devices is believed to be accurate and

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

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

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中文翻译

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