HDMI Provides High Definition Options for Connecting Devices

HDMI is a high-definition multimedia interface that came onto market in the early 2000s. Product vendors such as NVidia and ATI Radeon first adopted the protocol as a way to upgrade graphics options within digital systems. Developed as an alternative to the commonly-used analog interface, it incorporated both video and audio in it’s communication stream. Data is transmitted in uncompressed bits for processing by the receiver device.

HDMI is defined under the standard EIA/CEA-861. It is electrically compatible with the previously-developed digital video interface. The standard defines video formats and waveforms that developers may incorporate into devices for interaction with other equipment offered on the open market. The standard incorporates extended display identification data to enable display devices communication protocol for describing capabilities. This allows the receiving device information for successful setup and interaction once connected.

HDMI provides upgrades to audio and provides configuration options that allow versatile use with both backward- and forward-compatible devices. It interfaces directly with DVI but is also configurable for use with older LVDS and FPS linking technology as well as with DisplayPort technology. Updates to audio capabilities ensure the best experience when connected with Blu-ray devices. Each version of the standard added features to support the growing digital audio and display markets.

Parameters to Consider When Selecting an HDMI IC

HDMI is a versatile connection protocol for high-definition display and sound. Not only is it electrically compatible with DVI, it is also capable of user-control via remote. It uses a smaller connector able to transmit without attenuation at lengths up to 45 feet. Adding audio with enhanced color garnered awards from PC Magazine for technical excellence in home theatre and received an Emmy Award for technology and engineering.

HDMI interfaces to DVI without loss of data

The specifications define transmission rates, interfaces, and mechanical requirements for use of HDMI. Earlier versions produced max rates of 165 MHz for 1080p And WUXGA (1920 x 1200) displays. Later versions increased display rates, increasing from single to dual link to support higher pixel transmission rates. Compatibility with backward- and forward-compatible protocols means versatile processing of both Y’CbCr and RGB color.

There are multiple components that support HDMI, and many versions continue to be used in consumer and industrial applications. Below are three possible choices:

Analog Devices, ADV7612

This is a part designed to receive and process up to two HDMI ports. Designed to the HDMI 1.4a standard, all 3D video formats are supported along with various color formats backward-compatible with DVI. This part also supports high-bandwidth digital content protection extending its use with dedicated CPU and graphics ICs. There is an evaluation board available, the EVAL-ADV7612-7511P to develop within planned system blocks.

The ADV7612 … incorporates a dual input HDMI-capable receiver that supports all mandatory 3D TV formats defined in HDMI 1.4a specification, HDTV formats up to 1080p 36-bit Deep Color, and display resolutions up to UXGA (1600 x 1200 at 60 Hz).

Found on page 1 of ADV7612 datasheet

This part is qualified for automotive applications where it may find use within the electronic control unit. Other uses may find this part in projectors, video conferencing equipment, HDTVs, in soundbars, and in video switches.

Analog Devices, ADV7613

This part is designed with one HDMI input that is processed for LVDS output. The processor extracts audio from the HDMI stream and outputs in selectable formats that include super audio via direct stream digital. The processor provides features such as contrast, brightness, and saturation adjustments. And an evaluation board, the EVAL-ADV7613FEBZ, is available to develop ideas before incorporating into existing systems.

The ADV7613 is a high quality, low power, single-input HDMI to LVDS display bridge. It incorporates an HDMI capable receiver that supports up to 1080p, 60 Hz.

Found on page 1 of ADV7613 datasheet

This part comes in two versions, one qualified for consumer and one qualified for automotive use. Applications include use in projectors, in automotive head units, and in digital signage.

Texas Instruments, TFP401x

This part was designed with one DVI/HDMI input, able to output DVI/HDMI. It uses advanced CMOS technology to support up to 165 MHz, including 1080p and WUXGA at 60 Hz.

The TFP401 and TFP401A supports display resolutions up to 1080p and WUXGA in 24-bit true-color pixel format. The TFP401/401A offers design flexibility to drive one or two pixels per clock, supports TFT and DSTN panels, and provides an option for time-staggered pixel outputs for reduced ground bounce.

Found on page 1 of TFP401 datasheet

This part is suitable for use with both DVI and HDMI in high-definition televisions, high-definition personal computer monitors, digital video, high-definition projectors, and for HDMI video-only receivers.

HDMI is a high-definition multimedia interface with many options for use within today’s digital display equipment. Vendors offer ICs with options for using HDMI along with DVI-compatible devices for display in consumer or automotive environments. The website lists an array of ICs which may be found using our Similar Parts Selector. Along with options for ICs, the website lists sourcing options along with cost comparisons.

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