The CH7028B-TFI is a display encoder from Chrontel, Inc., designed to convert digital video signals to various analog and digital output formats, including TV-out (composite, S-video) and digital interfaces. It is used to connect computer graphics to televisions and other display devices.

Applications

• Embedded Systems: Provides TV-out capability for embedded systems and single-board computers.
• Set-Top Boxes: Used in set-top boxes for connecting to older TVs.
• Graphics Cards: Integrated in some graphics cards to offer TV-out functionality.
• Portable Media Players: Used in portable media players to display video on TVs.
• Surveillance Systems: Employed in surveillance systems for video output to analog monitors.

Features

• Digital-to-Analog Conversion: Converts digital RGB signals to analog composite and S-video.
• Multiple Output Formats: Supports composite, S-video, and potentially other digital output interfaces (check the datasheet for specifics).
• Macrovision Support: May include Macrovision anti-copy protection for TV-out.
• Programmable Output: Allows for configuration of output signals and formats.
• Low Power Consumption: Optimized for low power operation in portable devices.

Benefits

• TV Connectivity: Enables connection of computers and embedded systems to TVs.
• Versatile Output Options: Offers multiple output formats for compatibility with various displays.
• Cost-Effective Solution: Provides a cost-efficient way to add TV-out functionality.
• Simplified Design: Integrates necessary components for video encoding.
• Wide Compatibility: Supports various resolutions and video standards.

Additional Details

The CH7028B-TFI typically supports NTSC and PAL video standards. The exact supported resolutions, refresh rates, and output formats are detailed in the Chrontel datasheet. Macrovision support, if present, is used to prevent unauthorized copying of video content.

An external EEPROM is often used to store the configuration data, including output format settings, video parameters, and other control information. The CH7028B-TFI reads the configuration from the EEPROM on startup. The device is configured via I2C or other communication interfaces. Ensure proper power supply decoupling and grounding to minimize noise. Consult the datasheet for recommended PCB layout guidelines to ensure optimal signal integrity.

This chip is suitable for applications where analog TV output is required, especially when connecting modern digital devices to older analog displays. Proper application requires referencing the manufacturer’s datasheet for accurate specifications.