AD8197ASTZ

Overview

The AD8197ASTZ is a 4:1 HDMI/DVI switch with integrated equalization, manufactured by Analog Devices Inc. It supports data rates up to 2.25 Gbps and pixel clocks from 25 MHz to 225 MHz. The device features four high-speed TMDS channels per link with input cable equalization for long cables (up to 20 meters at 2.25 Gbps). It includes pre-emphasized outputs, globally switchable 50 Ω on-chip terminations, and auxiliary channels for DDC bus switching. Operating on a single 3.3 V supply, it is housed in a 100-lead LQFP package.

Feature Summary

• Integrated input cable equalizer enables operation with long HDMI cables exceeding 20 meters at maximum data rates.
• Supports flexible channel bundling modes including quad 4:1, dual 8:1, and single 16:1 switching configurations.
• Features fully buffered unidirectional high-speed inputs/outputs with pre-emphasized outputs and low added jitter.
• Includes auxiliary channels for bidirectional switching of the DDC bus and additional control signals.

Applications

• Multiple input displays
• Projectors
• A/V receivers
• Set-top boxes
• Advanced television (HDTV) sets

Procurement Notes

Verify the specific suffix ASTZ corresponds to the 100-lead LQFP Pb-free package when ordering. Confirm that the serial I2C slave address configuration meets system requirements if multiple devices are used on the same bus. Ensure power supply voltages match the specified 3.3 V nominal range for AVCC and DVCC, and 5 V for AMUXVCC.

Selection Notes

Select this component for systems requiring HDMI 1.3 compliance with support for deep color formats up to 1080p. Consider the AD8197 for applications needing extended cable lengths due to its built-in receiver equalization. Verify compatibility with HDCP standards if encryption is required. Check pin-to-pin compatibility with legacy designs using the AD8191 if migrating existing hardware.

Part Context

The AD8197 is part of Analog Devices' video signal processing portfolio, designed as a replacement for the AD8191. It provides a complete solution for switching HDMI and DVI sources while maintaining signal integrity over long interconnects. The device integrates both high-speed TMDS switching and low-speed auxiliary control routing into a single chip.

Replacement Considerations

The AD8197 is pin-to-pin compatible with the AD8191. When replacing older components, ensure that the control interface logic matches the new device's I2C or parallel requirements.

FAQ

What is the maximum data rate supported by the AD8197?

The AD8197 supports a maximum data rate of 2.25 Gbps per channel, enabling 1080p deep color (12-bit color) HDMI formats.

How does the AD8197 handle long cable runs?

It features an input cable equalizer that can compensate for more than 20 meters of 24 AWG cable at 2.25 Gbps, ensuring signal integrity.

Can the AD8197 be configured as a 16:1 switch?

Yes, through its flexible channel bundling modes, the AD8197 can be configured as a single 16:1 TMDS channel and auxiliary signal switch.