FEATURES
C0068 12-CHANNEL GAMMA CORRECTION
C0068 10-BIT RESOLUTION
C0068 DOUBLE-BUFFERED DAC REGISTERS
C0068 INTEGRATED REFERENCE BUFFERS
C0068 RAIL-TO-RAIL OUTPUT
C0068 LOW SUPPLY CURRENT: 900µA/ch
C0068 SUPPLY VOLTAGE: 7V to 18V
C0068 DIGITAL SUPPLY: 2.7V to 5.5V
C0068 INDUSTRY-STANDARD TWO-WIRE INTERFACE
− High-Speed Mode: 3.4MHz
C0068 HIGH ESD RATING:
− 4kV HBM, 1kV CDM, 200V MM
C0068 DEMOBOARD 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
D
A
C
R
egis
t
er
D
A
C
R
egis
t
er
Control IF
APPLICATIONS
C0068 TFT-LCD REFERENCE DRIVERS
C0068 REFERENCE VOLTAGE GENERATORS
C0068 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
SBOS315 − DECEMBER 2004
REFERENCE VOLTAGE GENERATOR
for LCD GAMMA CORRECTION
C0080C0082C0079C0068C0085C0067C0084C0073C0079C0078 C0068C0065C0084C0065 C0105C0110C0102C0111C0114C0109C0097C0116C0105C0111C0110 C0105C0115 C0099C0117C0114C0114C0101C0110C0116 C0097C0115 C0111C0102 C0112C0117C0098C0108C0105C0099C0097C0116C0105C0111C0110 C0100C0097C0116C0101C0046 C0080C0114C0111C0100C0117C0099C0116C0115
C0099C0111C0110C0102C0111C0114C0109 C0116C0111 C0115C0112C0101C0099C0105C0102C0105C0099C0097C0116C0105C0111C0110C0115 C0112C0101C0114 C0116C0104C0101 C0116C0101C0114C0109C0115 C0111C0102 C0084C0101C0120C0097C0115 C0073C0110C0115C0116C0114C0117C0109C0101C0110C0116C0115 C0115C0116C0097C0110C0100C0097C0114C0100 C0119C0097C0114C0114C0097C0110C0116C0121C0046
C0080C0114C0111C0100C0117C0099C0116C0105C0111C0110 C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101 C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046
www.ti.com
Copyright  2004, 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.