ADA4424-6ARUZ

Overview

The ADA4424-6 is a six-channel video reconstruction filter integrating standard definition (SD) and extended/high definition (ED/HD) sections. It features three SD channels with an 18 MHz typical 1 dB bandwidth and three ED/HD channels selectable for 25 MHz or 34/39 MHz bandwidths. The device provides a fixed gain of 6.2 dB and includes an internal charge pump to generate a negative supply rail, enabling dc-coupled outputs without external capacitors. It supports D-terminal and S-terminal signaling, offers flexible input dc offset cancellation for luma channels, and operates from single 3.3 V and 5 V supplies within the industrial temperature range.

Feature Summary

• Integrates separate SD and ED/HD filter sections with selectable corner frequencies for high-definition signal processing.
• Includes an on-board charge pump to create a negative supply rail, allowing rail-to-rail output swing and eliminating large output coupling capacitors.
• Provides dedicated support for D-terminal and S-terminal signaling with configurable aspect ratio and scan type outputs.
• Features four distinct modes for detecting and cancelling dc input offsets on luma channels to minimize output distortion.

Applications

• DVD players and recorders
• Set-top boxes
• Projectors
• Personal video recorders

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current data sheet to confirm package type and environmental compliance. Ensure the selected variant matches the required operating temperature range and packaging quantity specifications for your production needs.

Selection Notes

Select this component when designing systems requiring integrated filtering for both SD and HD video formats in a single package. Consider the available offset cancellation modes if dc coupling is necessary, and verify that the 38-lead TSSOP package fits the board layout constraints.

Part Context

This device belongs to Analog Devices' family of video reconstruction filters designed for consumer electronics. It consolidates multiple filter stages and signal conditioning functions into one IC, reducing the bill of materials and board space compared to discrete solutions for multi-format video applications.

Replacement Considerations

Check the manufacturer's official replacement guide for direct substitutes. Verify pin compatibility and electrical specifications before substituting with other video filter ICs.

FAQ

How is the filter corner frequency selected for the ED/HD channels?

The FC_SEL pin determines the bandwidth. Driving it low selects the 25 MHz ED mode, while driving it high selects the 39 MHz (Y) / 34 MHz (Pb/Pr) HD mode.

What is the purpose of the charge pump in this device?

The charge pump generates a negative voltage rail for the output stages. This allows the outputs to swing below ground, enabling dc-coupled connections to downstream components without requiring large external coupling capacitors.

Can the device handle DC offset cancellation for all inputs?

No, offset cancellation is only supported for the luma channels (Y_IN and HY_IN). Chroma and color difference inputs do not support this function and should be ac-coupled.