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AD723:  2.7 V to 5.5 V RGB-to-NTSC/PAL Encoder with Load Detect and Input Termination Switch

Product Details


The AD723 is a low cost RGB-to-NTSC/PAL encoder that converts analog red, green, and blue color component signals into their corresponding luminance and chrominance signals for display on an NTSC or PAL television. Luminance (Y) and Chrominance (C) signals are available individually for S-video, or combined for composite video (CV). All outputs are available separately and optimized for driving 75 Ω loads. Active termination is used for lower power consumption.

A smart load detect feature powers down unused outputs and can be used to monitor the continuing presence or absence of an external TV. This enables plug-and-play operation. In addition, a logic controlled triple switch at the input solves the applications problem of differing load conditions when an RGB monitor is disconnected. When an RGB monitor is not present, the R, G, and B terminations are enabled by the user. This solution ensures no loss of video bandwidth when the RGB monitor is in operation.

In PC applications, flicker filter support is provided by the graphics controller, which has direct access to memory. Underscan compensation, necessary for uses other than video or DVD, is supported through choice of RGB output clocks and sync intervals.

An optional luminance trap (YTRAP) provides a means of reducing cross color artifacts due to subcarrier frequency information in the Y signal.

The AD723 is available in a 28-lead TSSOP package and is capable of operation from supplies of 2.7 V to 5.5 V.

FEATURES and BENEFITS

  • Low cost, fully integrated solution for NTSC/PAL
  • Composite and Y/C (S-video) outputs
  • Current output drives 75 Ω loads
    DC-coupled: supports tv load detect
    No large ac-coupling capacitors at output
    Self-power-down of unloaded output drivers
  • Triple switch to enable RGB termination
  • Integrated delay line and auto-tuned filters
  • Y-trap to eliminate cross color artifacts
  • 3 V supply operation: low power
    < 100 mW: composite active (typical)
    < 150 mW: S-video active (typical)
    <1 µA: power down current

Functional Block Diagram for AD723

Documentation

Title Content Type File Type
AD723: 2.7 V to 5.5 V RGB-to-NTSC/PAL Encoder with Load Detect and Input Termination Switch Data Sheet  (Rev 0, 11/2000) (pdf, 678 kB) Data Sheets PDF
AN-336: JPEG Compression Application Notes HTML
AN-205: Video Formats and Required Load Terminations  (pdf, 241 kB) Application Notes PDF
Advantiv™ Advanced Television Solutions  (pdf, 549 kB)
Enhancing the HD system design and consumer experience, Analog Devices offers its Advantiv portfolio of video and audio integrated circuit solutions, specifically developed and optimized for advanced television applications.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD723 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD723ARUZ Status: Production 28 ld TSSOP (4.4mm) 28 Ind Tube, 50 $4.48 $3.81 Y  Material Info PCN Purchase Sample
AD723ARUZ-REEL Status: Production 28 ld TSSOP (4.4mm) 28 Ind Reel, 2500 $4.48 $3.81 Y  Material Info PCN Purchase
AD723ARUZ-REEL7 Status: Production 28 ld TSSOP (4.4mm) 28 Ind Reel, 1000 $4.48 $3.81 Y  Material Info PCN Purchase
AD723WARUZ-RL7 Status: Production 28 ld TSSOP (4.4mm) 28 Ind Reel, 1000 - - Y  Material Info PCN Purchase Sample
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD723 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD723-EBZ Status: Production Evaluation Board $266.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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