AL875 High Speed Triple 8-bit ADC

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See how the AL875 fits into your design

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The AL875 from Averlogic is a high-speed triple 8-bit monolithic analog-to-digital converter (ADC) designed for digitizing RGB graphics/video signal or other applications. The AL875's 110 MHz conversion rate can support display resolution up to 1280x1024 at 60Hz.

The AL875 accepts 0.7~2.5V analog input range without using pre-amplifiers which may reduce the overall S/N ratio. Digitized data is piped at the full clock rate to the 24-bit output port. The AL875 uses 3.3V power with 5V tolerant I/O and low power dissipation.

In addition, the active video (horizontal and vertical) starting and ending positions in the AL875 are also detected to ensure that the whole picture is fitted into the displayable region of the screen. Through an I2C interface, the AL875 is fully programmable to support various video resolutions.

AL875 Characteristics

• High speed 8-bit ADC up to 110MHz encode rate
• Support display resolution up to 1280x1024 at 60Hz
• Low power dissipation (0.8W typical at 3.3V, 110MHz)
• 0.6~2.0V p-p analog input range
• 10k~1MHz HSYNC locking range
• Full programmability via I2C interface
• Automatic screen position support
• Programmable clock phase adjustment
• TTL compatible digital inputs and outputs
• High impedance tri-state output
• Power-down mode
• Single 3.3 volt power with 5 volt tolerant I/O
• 100-pin 14x20 mm PQFP package

Applications

• LCD/PDP Monitors
• LCD Projectors
• Other Flat Panel Displays
• High-end Video/Graphics Processing

Upgrading from a TDA8752

The AL875's pin assignment is very similar to the TDA8752. Evaluating the outstanding quality of the AL875 simply needs adjustment of the following circuits on the existing TDA8752 board if any:

• Change the power source from 5V to 3.3V.
• Provide VRT and VRB voltages.
• Modify the PLL filter (RC) circuits.
• Program with different software.

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