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ADV7481 Integrated Video Decoder and Dual-Mode HDMI/MHL Receiver

The ADV7481 is an integrated video decoder and combined HDMI®/MHL® receiver. It is targeted at connectivity enabled head units requiring a wired, uncompressed digital audio/video link from smartphones and other consumer electronics devices to support streaming and integration of cloud-based multimedia content and applications into an automotive infotainment system.

The ADV7481 MHL 2.1 capable receiver supports a maximum pixel clock frequency of 75 MHz, allowing resolutions up to 720p/1080i at 60 Hz in 24-bit mode. The ADV7481 features a link control bus (CBUS) that handles the link layer, translation layer, CBUS electrical discovery, and display data channel (DDC) commands. The implementation of the MHL sideband channel (MSC) commands by the system processor can be handled either by the I2C bus, or via a dedicated serial peripheral interface (SPI) bus. A dedicated interrupt pin (INTRQ3) is available to indicate that events related to CBUS have occurred.

The ADV7481 also features an enable pin (VBUS_EN) to dynamically enable or disable the output of a voltage regulator, which provides a 5 V voltage bus (VBUS) signal to the MHL source.

The ADV7481 HDMI capable receiver supports a maximum pixel clock frequency of 162 MHz, allowing HDTV formats up to 1080p, and display resolutions up to UXGA (1600 × 1200 at 60 Hz). The device integrates a consumer electronics control (CEC) controller that supports the capability discovery and control (CDC) feature. The HDMI input port has dedicated 5 V detect and Hot Plug™ assert pins.

The HDMI/MHL receiver includes an adaptive transition minimized differential signaling (TMDS) equalizer that ensures robust operation of the interface with long cables.

The ADV7481 single receiver port is capable of accepting both HDMI and MHL electrical signals. Automatic detection between HDMI and MHL is achieved by using cable impedance detection through the CD_SENSE pin.

The ADV7481 contains a component processor (CP) that processes the video signals from the HDMI/MHL receiver. It provides features such as contrast, brightness, and saturation adjustments, as well as free run and timing adjustment controls for HS/VS/DE timing.

The ADV7481 analog front end (AFE) comprises a single high speed, 10-bit analog-to-digital converter (ADC) that digitizes the analog video signal before applying it to the SDP.

The eight analog video inputs can accept single-ended, pseudo differential, and fully differential composite video signals, as well as S-Video and YPbPr video signals, supporting a wide range of consumer and automotive video sources.

Short to battery (STB) events can be detected on differential input video signals. STB protection is provided by ac coupling the input video signals. The ADV7481, in combination with an external resistor divider, provides a common-mode input range of 4 V, enabling the removal of large signal common-mode transients present on the video lines.

The automatic gain control (AGC) and clamp restore circuitry allow an input video signal up to 1.0 V p-p at the analog video input pins of the ADV7481. Alternatively, the AGC and clamp restore circuitry can be bypassed for manual settings.

The SDP of the ADV7481 is capable of decoding a large selection of analog baseband video signals in composite, S-Video, and component formats. The SDP supports worldwide NTSC, PAL, and SECAM standards.

The ADV7481 features an 8-bit digital input/output port, supporting input and output video resolutions up to 720p/1080i in both the 8-bit interleaved 4:2:2 SDR and DDR modes.

APPLICATIONS

• Portable devices
• Automotive infotainment (head unit and rear seat entertainment systems)
• HDMI repeaters and video switches

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