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.