BUF08800

www.DataSheet4U.com BUF08800 SBOS380A − FEBRUARY 2007 − REVISED MAY 2007 Programmable Reference Generator and 400mA VCOM Driver FEATURES D 10-BIT RESOLUTION D 7- OR 8-CHANNEL GAMMA CORRECTION D INTEGRATED VCOM DRIVER: D D D D D D D 400mA PEAK CURRENT DIGITAL GATE VOLTAGE ADJUSTMENT CIRCUITS RAIL-TO-RAIL OUTPUT LOW SUPPLY CURRENT: 1mA/ch SUPPLY VOLTAGE: 7V to 22V DIGITAL SUPPLY: 2.0V to 5.5V INDUSTRY-STANDARD, TWO-WIRE INTERFACE HIGH ESD RATING: 4kV HBM DESCRIPTION The BUF08800 reference generator offers eight programmable reference channels that can be used depending on the application needs. For example, all eight channels can be used for gamma correction, or some as gamma references and some to digitally adjust the gate voltages or VCOM. All gamma/VCOM channels swing to within 100mV of the positive or negative supply rail with a 10mA load. All channels are programmed using a standard two-wire interface that supports standard operation up to 400kHz and also high-speed data transfer up to 3.4MHz. The integrated VCOM driver features up to 400mA peak current drive. VCOM voltage compensation at different locations on the LCD panel can be accomplished using the negative input of the integrated VCOM op amp. The Gate High and Low voltages can differ because of changes in panel size or technology. The BUF08800 supports digital adjustment circuits for the gate voltages. This feature enables the adjustment of gate voltages through software without changing hardware, thus reducing d...