MAX7438ETP+

Overview

The MAX7438ETP+ is a triple-channel video reconstruction filter with an integrated back-porch clamp. It operates from ±5V dual supplies and features a maximally flat passband from DC to 5MHz with 60dB attenuation at 27MHz. The MAX7438 provides a fixed internal gain of +2V/V, while the MAX7439 offers +3V/V. Each channel includes adjustable high-frequency boost up to 2dB and can drive two standard 150Ω video loads. The device eliminates AC-coupling capacitors through direct input/output coupling and clamps the output blanking level to ground.

Feature Summary

• Back-porch clamp sets output blanking level to ground
• Eliminates need for large AC-coupling capacitors
• Adjustable high-frequency boost control
• Filter bypass mode available

Applications

• Set-top boxes and hard disk recorders
• DVD players and game consoles
• Camcorders
• Composite, component, and S-Video outputs for NTSC, PAL, and SDTV

Procurement Notes

Verify the specific suffix ETP against the official datasheet to confirm the package type and temperature range. Ensure the design utilizes dual ±5V power supplies as required by the electrical characteristics. Confirm that the exposed paddle is connected to VSS rather than ground during assembly.

Selection Notes

Select the MAX7438ETP+ when a fixed +2V/V gain is required for the video signal path. Choose this component if the application demands a maximally flat passband response and precise back-porch clamping to eliminate line-time distortion. Verify compatibility with the 20-pin Thin QFN footprint.

Part Context

This component belongs to the MAX7438/MAX7439 family of triple-channel video reconstruction filters. The series is designed for digital video devices requiring antialiasing and DAC smoothing. The ETP suffix indicates the 20-pin Thin QFN package with an exposed paddle, suitable for surface-mount applications.

Replacement Considerations

The MAX7439ETP+ is the primary alternative within the same package, offering a different fixed gain of +3V/V instead of +2V/V. No other cross-model substitutes are documented in the provided source material.