BUF20800 Datasheet, PDF (1/27 Pages) Burr-Brown (TI) – 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels

BUF20800
SBOS329D − JUNE 2005 − REVISED OCTOBER 2006
18-Channel GAMMA VOLTAGE GENERATOR
with Two Programmable V_COM Channels
FEATURES
D 18-CHANNEL GAMMA CORRECTION
D 2-CHANNEL PROGRAMMABLE V_COM:
100mA I_OUT
D 10-BIT RESOLUTION
D RAIL-TO-RAIL OUTPUT
D LOW SUPPLY CURRENT: 900µA/ch
D SUPPLY VOLTAGE: 7V to 18V
D DIGITAL SUPPLY: 2.0V to 5.5V
D INDUSTRY-STANDARD, TWO-WIRE
INTERFACE:
3.4MHz High-Speed Mode
D HIGH ESD RATING:
4kV HBM, 1kV CDM, 200V MM
D DEMO BOARD AND SOFTWARE AVAILABLE
Analog
(7V to 18V)
Digital
(2.0V to 5.5V) REFH
BUF20800
REFH OUT
V_{CO M OUT1}
V_{CO M OUT2}
OUT 1
OUT 2
18 Output Channels plus
Two V_COM Channels
OUT 17
SDA
SCL
Control IF
LD
AO
REFL
OUT 18
REFL OUT
APPLICATIONS
D REPLACES RESISTOR-BASED GAMMA
SOLUTIONS
D TFT-LCD REFERENCE DRIVERS
D 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 V_COM 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
FEATURES
18-Channel Programmable, Two V_COM + OTP Memory
12-Channel Programmable Buffer, 10-Bit
Programmable V_COM
11-, 6-, 4-Channel Gamma Correction Buffer, 18V Supply
High-Speed V_COM, 1 and 2 Channels
Complete LCD DC/DC Solution
PRODUCT
BUF20820
BUF12800
BUF01900
BUFxx704
SN10501
TPS65100
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a registered trademark of Texas Instruments. All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright  2005−2006, Texas Instruments Incorporated
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