AD8191AASTZ

Overview

The AD8191AASTZ is a 4:1 HDMI/DVI switch with equalization, supporting data rates up to 1.65 Gbps and pixel clocks up to 165 MHz. It features four TMDS channels per link with input cable equalization for long cables (20 meters at 1080p) and pre-emphasized outputs. The device operates on a single 3.3 V supply with auxiliary channels requiring 3.3 V to 5 V. It includes globally switchable 50 Ω terminations, low added jitter (40 ps p-p deterministic), and supports HDCP standards. The component is housed in a 100-lead LQFP package operating from -40°C to +85°C.

Feature Summary

• Integrated input cable equalizer compensates for signal loss over long HDMI cables.
• Pre-emphasized outputs optimize signal integrity for downstream transmission lines.
• Auxiliary switch routes DDC bus and two additional signals for complete HDMI compliance.
• Supports both serial I2C and parallel control interfaces for flexible system integration.

Applications

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

Procurement Notes

Verify the specific suffix 'ASTZ' against the manufacturer's ordering guide to confirm temperature range and packaging details. Ensure the design accounts for the 100-lead LQFP thermal requirements and power dissipation limits under maximum pre-emphasis conditions. Confirm that the AMUXVCC supply voltage aligns with the auxiliary channel high-impedance requirements for proper DDC bus operation during power-down states.

Selection Notes

Select this component when systems require switching between four HDMI or DVI sources while maintaining signal quality over extended cable lengths. The integrated equalization eliminates the need for external repeaters. Consider the dual control interface options if parallel signaling is preferred for speed or I2C for pin count reduction. Ensure the application supports the required 3.3 V logic levels and 5 V auxiliary supply tolerance.

Part Context

The AD8191A belongs to Analog Devices' family of HDMI/DVI switches designed for high-definition video routing. It is pin-to-pin compatible with the AD8197A, allowing for direct upgrades or replacements in existing designs. The device addresses the need for robust signal switching in consumer electronics where long cable runs are common, providing a single-chip solution for HDMI 1.2a receive-compliant systems.

Replacement Considerations

The AD8197A is a pin-to-pin compatible substitute within the same product family.

FAQ

How does the AD8191A handle long HDMI cables?

It features an input cable equalizer that can compensate for more than 20 meters of 24 AWG cable at 1080p resolution by applying high-frequency boost.

What control interfaces are available?

The device supports both a serial I2C slave interface and a parallel control interface, allowing flexibility in system architecture.