Texas Instruments BUF20800 18-Channel
Gamma Voltage Generator
Texas Instrument's BUF20800 18-Channel Gamma Voltage Generator is a programmable voltage reference generator designed for gamma correction in TFT-LCD panels. It provides 18 programmable outputs for gamma correction and two channels for VCOM adjustment, each with 10-bit resolution. This programmability replaces the traditional, time consuming 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 changes can also be easily implemented without hardware changes. The BUF20800 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 through an industry standard, two-wire serial interface. Unlike existing programmable buffers, the BUF20800 offers a high-speed mode that allows clock speeds up to 3.4MHz.