MAX7432EUD

Overview

The MAX7432EUD is a triple-channel standard definition video reconstruction filter and buffer manufactured by Maxim Integrated. It operates on a single +5V supply and features a 6th-order lowpass Butterworth filter optimized for NTSC, PAL, and SDTV signals. The device includes an input multiplexer, four levels of passband high-frequency boost control, and output disable functionality via the Single Pin Bus (MSPB) interface. It provides a +6dB gain output buffer capable of driving two 150Ω video loads. Electrical specifications include a stopband attenuation of 48 dB at frequencies above 27 MHz, a signal-to-noise ratio of 72 dB, and a supply current ranging from 68 mA to 86 mA. The component functions reliably within an extended temperature range of -40°C to +85°C.

Feature Summary

• Triple-channel architecture designed for component video applications such as YPbPr or embedded synchronous RGB.
• Integrated 6th-order Sallen-Key Butterworth filter with digital autotrimming for corner frequency stability.
• Programmable high-frequency boost with four selectable levels to compensate for signal degradation.
• Single Pin Bus (MSPB) serial interface enabling unique addressing for up to 16 devices on one bus.

Applications

• Set-Top Boxes
• DVD Players
• Hard-Disk Recorders
• Camcorders

Procurement Notes

Verify the specific ordering suffix EUD corresponds to the 14-pin TSSOP package variant when sourcing components. Confirm that the manufacturer designation aligns with Maxim Integrated products, noting historical corporate acquisitions may affect branding on documentation. Ensure the procurement source provides original manufacturer datasheets to validate the electrical characteristics and pinout configuration against the official specification sheet.

Selection Notes

Select this component for designs requiring simultaneous processing of three independent analog video channels. The integrated MSPB interface simplifies system control compared to discrete solutions. Verify that the application environment supports the required +5V supply voltage and that the thermal dissipation capabilities of the TSSOP package are sufficient for the operating conditions. Consider the external capacitor requirements for address initialization if multiple units share the same bus line.

Part Context

This device belongs to the MAX7428/MAX7430/MAX7432 family of standard definition video reconstruction filters. While the MAX7428 handles single-channel composite video and the MAX7430 manages dual-channel S-Video, the MAX7432 specifically addresses triple-channel component video needs. All variants share identical core filtering technology and control interfaces but differ in channel count and physical package dimensions.

Replacement Considerations

Direct functional replacements within the same family include the MAX7428EUA for single-channel composite applications and the MAX7430EUW for dual-channel S-Video tasks. These alternatives utilize different packages and channel counts but maintain compatibility with the same MSPB control protocol and +5V power requirements.

FAQ

How is the unique address assigned to each MAX7432 device on the MSPB bus?

Address assignment is determined by the time constant created by an external capacitor connected in parallel with the internal 300kΩ resistor at the REXT pin. Devices initialize in descending order of their RC time constants.

What is the function of the SYNCIO pin on the MAX7432?

The SYNCIO pin can be configured via the control register to function either as a sync pulse input or output, allowing synchronization between multiple video channels or external systems.

Can the MAX7432 drive video loads directly without series capacitors?

Yes, the output buffer is capable of driving 75Ω backmatch resistors and video loads directly. Series capacitors are optional and typically used in SCART applications.