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FEATURES
D 12-CHANNEL GAMMA CORRECTION
D 10-BIT RESOLUTION
D DOUBLE-BUFFERED DAC REGISTERS
D INTEGRATED REFERENCE BUFFERS
D RAIL-TO-RAIL OUTPUT
D LOW SUPPLY CURRENT: 900µA/ch
D SUPPLY VOLTAGE: 7V to 18V
D DIGITAL SUPPLY: 2.3V to 5.5V
D INDUSTRY-STANDARD TWO-WIRE INTERFACE
− High-Speed Mode: 3.4MHz
D HIGH ESD RATING:
− 4kV HBM, 1kV CDM, 200V MM
D DEMO BOARD AND SOFTWARE AVAILABLE
Out A
13
REFH
3
V
S
1, 2
BUF12800
V
SD
4
REFL
10 9 11, 12
A0
7
LD
8
SCL
5
SDA
6
Out B
14
Out C
15
Out D
16
Out E
17
Out F
18
Out G
19
Out H
20
Out I
21
Out J
22
Out K
23
Out L
24
DAC Register
DAC Register
Control IF
APPLICATIONS
D TFT-LCD REFERENCE DRIVERS
D REFERENCE VOLTAGE GENERATORS
D 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 program-
mable buffers.
Programming of each output occurs through an industry-
standard, two-wire serial interface. Unlike existing
programmable buffers, the BUF12800 offers a high-
speed, two-wire interface mode that allows clock speeds
up to 3.4MHz. The BUF12800 features a double-buffered
DAC register structure that significantly simplifies imple-
mentation 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.
BUF12800 RELATED PRODUCTS
FEATURES PRODUCT
11-Channel Gamma Correction Buffer, Int V
COM
BUF11702
6-Channel Gamma Correction Buffer, Int V
COM
BUF07703
6-Channel Gamma Correction Buffer BUF06703
4-Channel Gamma Correction Buffer, Int V
COM
BUF05703
High-Supply Voltage Gamma Buffers BUFxx704
20-Channel Programmable Buffer, 10-Bit, V
COM
BUF20800
BUF12800
SBOS315D − DECEMBER 2004 − REVISED DECEMBER 2007
REFERENCE VOLTAGE GENERATOR
for LCD GAMMA CORRECTION
! !
www.ti.com
Copyright 2004−2007, Texas Instruments Incorporated
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.
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