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 BenefitsDC-coupled: supports tv load detect No large ac-coupling capacitors at output Self-power-down of unloaded output drivers < 100 mW: composite active (typical) < 150 mW: S-video active (typical) <1 µA: power down current | Audio & Video ProductsSoftware & Systems Requirements |
| Document | note |
| AD723: 2.7 V to 5.5 V RGB-to-NTSC/PAL Encoder with Load Detect and Input Termination Switch Data Sheet (Rev. 0) | PDF 678 kB |
| Document | note |
| AN-205: Video Formats and Required Load Terminations | PDF 241 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD723ARUZ Production | 28 ld TSSOP (4.4mm) | OTH 50 | -40 to 85C | 4.48 | 3.81 | Y |
| AD723ARUZ-REEL Production | 28 ld TSSOP (4.4mm) | REEL 2500 | -40 to 85C | 4.48 | 3.81 | Y |
| AD723ARUZ-REEL7 Production | 28 ld TSSOP (4.4mm) | REEL 1000 | -40 to 85C | 4.48 | 3.81 | Y |
| AD723WARUZ-RL7 Production | 28 ld TSSOP (4.4mm) | REEL 1000 | -40 to 85C | 4.48 | 3.81 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| AD723-EBZ | Evaluation Board | 266 | Y |
