FEATURES

18-CHANNEL GAMMA CORRECTION

2-CHANNEL PROGRAMMABLE VCOM:

100mA IOUT

10-BIT RESOLUTION

RAIL-TO-RAIL OUTPUT

LOW SUPPLY CURRENT: 900μA/ch

SUPPLY VOLTAGE: 7V 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

APPLICATIONS

REPLACES RESISTOR-BASED GAMMA

SOLUTIONS

TFT-LCD REFERENCE DRIVERS

DYNAMIC GAMMA CONTROL

DESCRIPTION

The BUF20800 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, 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 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 industrystandard,

two-wire serial interface. Unlike existing

programmable buffers, the BUF20800 offers a high-speed

mode that allows clock speeds up to 3.4MHz.

For lower channel count, please contact your local sales

or marketing representative.

The BUF20800 is available in an HTSSOP-38

PowerPAD package. It is specified from −40°C to +85°C.