FEATURES
12-CHANNEL GAMMA CORRECTION
10-BIT RESOLUTION
DOUBLE-BUFFERED DAC REGISTERS
INTEGRATED REFERENCE BUFFERS
RAIL-TO-RAIL OUTPUT
LOW SUPPLY CURRENT: 900μA/ch
SUPPLY VOLTAGE: 7V to 18V
DIGITAL SUPPLY: 2.3V to 5.5V
INDUSTRY-STANDARD TWO-WIRE INTERFACE
− High-Speed Mode: 3.4MHz
HIGH ESD RATING:
− 4kV HBM, 1kV CDM, 200V MM
DEMO BOARD AND SOFTWARE AVAILABLE

APPLICATIONS
TFT-LCD REFERENCE DRIVERS
REFERENCE VOLTAGE GENERATORS
INDUSTRIAL PROCESS CONTROL

DESCRIPTION
The BUF12800 is a programmable voltage reference
generator designed for dynamic gamma correction in
TFT-LCD panels. It provides 12 programmable outputs,
each with 10-bit resolution.
TI’s new, small geometry, state-of-the-art, analog CMOS
process allows the use of one digital-to-analog converter
(DAC) per channel while still maintaining a very small chip
size. This topology has the advantage of significantly
increased programming speed over existing programmable
buffers.
Programming of each output occurs through an industrystandard,
two-wire serial interface. Unlike existing
programmable buffers, the BUF12800 offers a highspeed,
two-wire interface mode that allows clock speeds
up to 3.4MHz. The BUF12800 features a double-buffered
DAC register structure that significantly simplifies implementation
of dynamic gamma control. This further reduces
programming time, especially when many channels have
to be updated simultaneously.
Reference pins set the high and low voltages of the output
range. They are internally buffered, which simplifies
design. They may be connected to external resistors to
divide the output range for finer resolution of outputs.
The BUF12800 is available in a TSSOP-24 PowerPAD
package. It is specified from −40°C to +85°C.