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  • Three 10-bit high speed DACs

  • Sampling frequency up to 200 MHz

  • DAC output current range: 2.0 mA to 36 mA

  • Wide range of input resolutions support for up to 1920x1200@75Hz (i.e. 640x480, 800x600, 1024x768, 1280x1024, 1600x1200 and etc.)

  • Composite Sync Control input

  • Composite Sync output

  • Sync on Green mode support

  • Analog video outputs compliant with VESA VSIS v1r2 specification

  • Power-down mode support

  • Contrast and Brightness adjustment support

  • Serial programmable interface support

  • IO Supply Voltages from 1.8V to 3.3V.

  • Offered in a 40-pin QFN package


Chrontel’s CH7055A is a low-cost, low-power semiconductor device that consists of three separate 10-bit video Digital-to-Analog Converters (DACs), which can convert the digital input signals into analog current outputs at a maximum conversion rate of 200 MHz.

The DACs are based on current source architecture. Sync and DAC Control Logic module receives horizontal and vertical sync input, generates composite sync and internal synchronization control signal. The CH7055A has a Power-down mode to reduce power consumption as required.

The CH7055A is fabricated in a CMOS process that ensures high functionality with low power dissipation. With advanced Image Enhancement module integrated to achieve the modification of the contrast, brightness, etc, the display quality can be flexible adjusted and optimized through the serial programmable interface.

Structure diagram

Data sheet

Application Desc

  •   PCB Layout and Design Considerations for CH7055, AN-B024.

Technical Report



Input Interface TTL/Digital RGB

Output Interface  Analog RGB + Csync

Audio Interface   No

Other features   No

Package Type  QFN40


Part Number Package Type Operating Temperature Range Minimum Order Quantity

CH7055A-BF  40 QFN, Lead-freeCommercial : -20 to 70°C490/Tray

CH7055A-BFI 40 QFN, Lead-freeIndustrial : -40 to 85°C490/Tray




About Chrontel Overview Chrontel, headquartered in San Jose, California, is a privately-held company with over 130 employees worldwide. Incorporated in 1986, the company develops and markets mixed-signal integrated circuits for the PC, display and consumer mark...


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