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FEATURES GENERAL DESCRIPTION

? Three 10-bit high speed DACs

? Sampling frequency up to 165 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

APPLICATION

? Car Entertainment Devices

? PC video cards

? High resolution image processing

? Digital video systems

? General purpose high-speed digital-to-analog

conversion

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 165 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.