AD8195ACPZ-R7

Overview

The AD8195ACPZ-R7 is an HDMI/DVI buffer with equalization, featuring one input and one output link. It supports four TMDS channels per link with data rates from 250 Mbps to 2.25 Gbps and pixel clocks from 25 MHz to 225 MHz. The device includes equalized inputs for long cables (up to 20 m at 2.25 Gbps) and preemphasized outputs. It provides fully buffered unidirectional high-speed channels with 50 Ω on-chip terminations, low added jitter, and a transmitter disable feature. Auxiliary channels include bidirectional buffered DDC lines and a CEC line with integrated 27 kΩ pull-up resistors. Powered independently from the 5 V HDMI connector, it supports logic level translation between 3.3 V and 5 V. The component operates within a temperature range of -40°C to +85°C and is housed in a 40-lead LFCSP_VQ package measuring 6 mm × 6 mm.

Feature Summary

• Enables HDMI 1.3a-compliant front panel input with support for deep color formats and resolutions greater than UXGA.
• Input cable equalizer compensates for signal degradation over long cables, supporting runs exceeding 20 meters at maximum data rates.
• Auxiliary buffers isolate and manage DDC and CEC buses independently, maintaining functionality when the main system power is off.
• Transmitter disable feature reduces power dissipation by disabling input termination and presenting a high impedance state.

Applications

• Front panel buffer for advanced television (HDTV) sets
• AVR-type applications requiring direct routing to HDMI/DVI connectors

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure compatibility with required packaging or environmental specifications. Confirm that the component meets all necessary regulatory standards for your target market. Check for any product change notifications that may affect pinout or electrical characteristics. Ensure availability aligns with production timelines as supply status can vary.

Selection Notes

Select this component for designs requiring robust buffering of HDMI or DVI signals across long interconnects. The integrated equalization and preemphasis capabilities make it suitable for systems where signal integrity is compromised by cable length or PCB trace losses. Consider the independent auxiliary power supply if maintaining DDC/CEC communication during system power-off states is required. Ensure the design accommodates the 40-lead LFCSP_VQ package constraints.

Part Context

The AD8195 belongs to Analog Devices' family of video interface buffers designed for high-definition multimedia applications. It addresses the need for signal regeneration and compliance with HDMI/DVI standards in consumer electronics. The device integrates both high-speed TMDS buffering and low-speed control line management into a single solution, simplifying board layout for front-panel interfaces.

Replacement Considerations

Consult official Analog Devices documentation for confirmed substitute part numbers. Verify functional equivalence regarding data rate support, package dimensions, and auxiliary channel configurations before substitution.

FAQ

How does the AD8195 maintain DDC and CEC functionality when the system is powered off?

The auxiliary buffers are powered independently from the TMDS link via the AMUXVCC pin. By connecting this pin to the 5 V supply provided by the HDMI source, the DDC and CEC lines remain active even when the local system power is off.

What is the purpose of the preemphasis feature in the AD8195?

Preemphasis boosts the high-frequency energy of the transmitted signal to compensate for losses in long output cables or PCB traces. This improves transition times and eye opening at the receiver end, allowing for longer cable runs without signal degradation.