BUF20820,pdf(18-Channel Gamma

The BUF20820 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. 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, 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 voltage changes can also be easily implemented without hardware changes.

The BUF20820 uses TI’s latest, small-geometry analog CMOS process, which makes it a very competitive choice for full production, not just evaluation.