AD724JR

Overview

The AD724JR is a low-cost RGB to NTSC/PAL encoder manufactured by Analog Devices Inc. It converts red, green, and blue component signals into luminance and chrominance outputs compliant with NTSC or PAL standards. The device operates from a single +5 V supply (range: 4.75 V to 5.25 V) and accepts FSC or 4FSC clocks via the FIN pin. It features logic-selectable encoding modes and provides composite video, separate Y/C (S-Video), and luminance outputs capable of driving 75 Ω reverse-terminated loads. The unit is housed in a compact 16-lead SOIC package.

Feature Summary

• Integrated RGB-to-YUV encoding matrix with on-chip DC clamps for input signal conditioning
• Simultaneous generation of composite video, luminance, and chrominance outputs without external filters or delay lines
• Internal sampled-data delay line ensures time alignment between luma and chroma signals
• Flexible clocking options supporting FSC/4FSC CMOS inputs or parallel-resonant crystals

Applications

• Converting VGA port RGB signals to NTSC/PAL television standards
• Low-cost video encoding solutions for embedded systems
• Direct interfacing with graphics controllers requiring minimal external components

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm packaging type and reel specifications. Ensure the selected variant matches the required temperature range and physical package dimensions for your PCB layout. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity before placing orders.

Selection Notes

Select this component when a dedicated RGB-to-composite encoder is required for NTSC or PAL applications. It is suitable for designs needing simultaneous S-video and composite outputs. Verify that the system can provide the necessary HSYNC/VSYNC signals and that the power supply remains stable within the specified +5 V tolerance. Consider thermal dissipation requirements if operating near the upper temperature limit.

Part Context

The AD724 belongs to Analog Devices' family of analog video encoders designed for standard definition television formats. It serves as a bridge between digital or component-based video sources and legacy analog display devices. The device simplifies circuit design by integrating filtering and timing functions typically handled by discrete components, making it a common choice for cost-sensitive video conversion hardware.

Replacement Considerations

The AD724JR-REEL and AD724JR-REEL7 are tape-and-reel versions of the same functional device. No direct cross-manufacturer substitutes are confirmed in the provided documentation.