BUF16820

BUF16820 BU F1 68 20 SBOS356A − FEBRUARY 2006 − REVISED OCTOBER 2006 14-Channel GAMMA VOLTAGE GENERATOR with Programmable VCOM Outputs and OTP Memory FEATURES D D D D D D D D D D D www.DataSheet4U.com APPLICATIONS D D 14-CHANNEL GAMMA CORRECTION 2 VCOM OUTPUTS ON-CHIP OTP MEMORY 10-BIT RESOLUTION RAIL-TO-RAIL OUTPUT LOW SUPPLY CURRENT: 1mA/ch SUPPLY VOLTAGE: 8.5V to 18V DIGITAL SUPPLY: 2.0V to 5.5V INDUSTRY-STANDARD, TWO-WIRE INTERFACE: 3.4MHz HIGH-SPEED MODE HIGH ESD RATING: 4kV HBM, 1kV CDM, 200V MM DEMO BOARD AND SOFTWARE AVAILABLE D REPLACES RESISTOR-BASED GAMMA SOLUTIONS TFT-LCD REFERENCE DRIVERS DYNAMIC GAMMA CONTROL DESCRIPTION The BUF16820 is a programmable voltage reference generator designed for gamma correction in TFT-LCD panels. It provides 14 programmable outputs and two VCOM channels, each with 10-bit resolution. It offers on-chip, one-time programmable (OTP) memory that allows the user to store the gamma voltages on-chip. This eliminates the need for an external EEPROM. This programmability replaces the traditional, timeconsuming process of changing resistor values to optimize the various gamma voltages, and allows designers to determine the correct gamma voltages for a panel very quickly. Required voltage changes can also be easily implemented without changing the hardware. The BUF16820 uses TI’s latest, small-geometry analog CMOS process, which makes it a very competitive choice for full production, not just evaluation. Programming of each output occurs...