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BUF20800-BUF20800AIDCPR
18-Channel Gamma Voltage Generator with Two Programmable VCOM Channels
FEATURES 18-CHANNEL GAMMA CORRECTION 2-CHANNEL PROGRAMMABLE V COM:
100mA I OUT�
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 AVAILABLEREFH OUT
REFH
Digital
(2.0Vto 5.5V)
Analog
(7Vto18V)
REFLAOLD
SCL
SDA
REFL OUT
OUT18
OUT17
OUT1
OUT2
VCOMOUT1
VCOMOUT2
APPLICATIONS REPLACES RESISTOR-BASED GAMMA
SOLUTIONS TFT-LCD REFERENCE DRIVERS DYNAMIC GAMMA CONTROL
DESCRIPTIONThe 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, 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.
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.
BUF20800 RELATED PRODUCTS
BUF20800SBOS329E − JUNE 2005 − REVISED DECEMBER 2007
18-Channel GAMMA VOLT AGE GENERATOR
with Two Programmable V COM Channels
