AD722JR-16-REEL7

更新时间： 2024-09-22 22:12:03

品牌	Logo	应用领域
亚德诺 - ADI		编码器
页数	文件大小	规格书
12页	365K
描述
RGB to NTSC/PAL Encoder

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数据手册
替代型号

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AD722JR-16-REEL7 数据手册

RGB to NTSC/PAL Encoder

AD722

FEATURES

Low Cost, Integrated Solution

+5 V Operation

The AD722 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 AD722’s on-chip oscilla-

tor generate the necessary subcarrier clock. The AD722 also ac-

cepts the subcarrier clock from an external video source.

Accepts FSC Clock or Crystal, or 4FSC Clock

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

Minimal External Components:

No External Filters or Delay Lines Required

Onboard DC Restoration

Accepts Either HSYNC & VSYNC or CSYNC

Phase Lock to External Subcarrier

Drives 75 Ω Reverse-Terminated Loads

Logic Selectable NTSC or PAL Encoding Modes

Compact 16-Pin SOIC

The interface to VGA Controllers and MPEG Video Decoders

is simple: an on-chip logic “XNOR” accepts the available verti-

cal (VSYNC) and horizontal sync (HSYNC) signals and creates

the composite sync (CSYNC) signal on-chip. If available, the

AD722 will also accept a standard CSYNC signal by connecting

VSYNC to +5 V and applying CSYNC to HSYNC pin. The

AD722 contains decoding logic to identify valid HSYNC pulses

for correct burst insertion.

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

aliasing, 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 sup-

press harmonics in the output. These low-pass filters are opti-

mized for minimum pulse overshoot. The overall luma delay,

relative to chroma, has been designed to be 170 ns, which

precompensates for delays in the filters used in the IF section of

a television receiver. This precompensation delay is already

present in TV broadcasts. The AD722 comes in a space-saving

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

perature range.

PRODUCT DESCRIPTION

The AD722 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 out-

puts can simultaneously drive 75 Ω, reverse-terminated cables.

All logical inputs are CMOS compatible. The chip operates

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

required. The AD722 may be powered down when not in use.

FUNCTIONAL BLOCK DIAGRAM

PHASE

DETECTOR

FSC

SUB-

CARRIER

CHARGE

PUMP

FILTER

LOOP

4FSC

VCO

XOSC

SYNC

4FSC

FSC

CSYNC

NTSC/PAL

HSYNC

VSYNC

SEPARATOR

BURST

XNOR

CSYNC

SC 90°/270°

FSC 90

±180°

(PAL ONLY)

QUADRATURE

4FSC

NTSC/PAL

CLOCK

DECODER

FSC 0

AT 4FSC

BURST

SAMPLED-

DATA

DELAY

LINE

3-POLE

LP PRE-

FILTER

2-POLE

LP POST-

FILTER

RED

CSYNC

INSERTION

LUMINANCE

OUTPUT

CLAMP

COMPOSITE

OUTPUT

NTSC/PAL

RGB-TO-YUV

ENCODING

MATRIX

GREEN

BLUE

4-POLE

LPF

CLAMP

3-POLE LPF

3.6MHz (NTSC)

4.4MHz (PAL)

CHROMINANCE

OUTPUT

BALANCED

MODULATORS

4-POLE

LPF

CLAMP

REV. 0

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

12 3 4 5 6 7...12

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AD722JR-16-REEL7 替代型号

型号	品牌	替代类型	描述	数据表
AD722JR-16-REEL	ADI	功能相似	RGB to NTSC/PAL Encoder

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