AD723

Features:

Low Cost, Fully Integrated Solution for NTSC/PAL
Composite and Y/C (S-Video) Outputs
Current Output Drives 75 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 A: Power-Down Current




Application

TV Out for Personal Computers/Laptops
Digital Cameras
Set-Top Boxes
Video Games
Internet Appliances




Pinout








Specifications

Supply Voltage, AVDD to AGND . . . . . . . . . . . . . . . . . . . 6 V
Supply Voltage, DVDD to DGND . . . . . . . . . . . . . . . . . . 6 V
AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . 0.3 V to +0.3 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . 0.3 V to +0.3 V
Inputs . . . . . . . . . . . . . . . . . . DGND 0.3 to DVDD + 0.3 V
Internal Power Dissipation . . . . . . . . . . . . . . . . . . 800 mW
Operating Temperature Range . . . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . .65°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . 300°C






Description

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. Under-scan compensation, necessary for uses other than video or DVD, is supported through choice of RGB output clocks and sync intervals.