BUF08800 Datasheet, PDF (1/23 Pages) Burr-Brown (TI) – Programmable Reference Generator and 400mA VCOM Driver

BUF08800
SBOS380A − FEBRUARY 2007 − REVISED MAY 2007
Programmable Reference Generator
and 400mA V_COM Driver
FEATURES
D 10-BIT RESOLUTION
D 7- OR 8-CHANNEL GAMMA CORRECTION
D INTEGRATED V_COM DRIVER:
400mA PEAK CURRENT
D DIGITAL GATE VOLTAGE ADJUSTMENT
CIRCUITS
D RAIL-TO-RAIL OUTPUT
D LOW SUPPLY CURRENT: 1mA/ch
D SUPPLY VOLTAGE: 7V to 22V
D DIGITAL SUPPLY: 2.0V to 5.5V
D INDUSTRY-STANDARD, TWO-WIRE
INTERFACE
D HIGH ESD RATING: 4kV HBM
APPLICATIONS
D TFT-LCD REFERENCE DRIVERS
D REFERENCE VOLTAGE GENERATORS
V_SD
V_S
BUF08800
10−Bit
DAC
250kΩ
10−Bit
DAC
+IN (V_COM)
V_COM (OUT 1)
−IN (V_COM)
OUT 2
10−Bit
DAC
OUT 3
DESCRIPTION
The BUF08800 reference generator offers eight program-
mable reference channels that can be used depending on
the application needs. For example, all eight channels can
be used for gamma correction, or some as gamma
references and some to digitally adjust the gate voltages
or V_COM.
All gamma/V_COM channels swing to within 100mV of the
positive or negative supply rail with a 10mA load. All
channels are programmed using a standard two-wire
interface that supports standard operation up to 400kHz
and also high-speed data transfer up to 3.4MHz.
The integrated V_COM driver features up to 400mA peak
current drive. V_COM voltage compensation at different
locations on the LCD panel can be accomplished using the
negative input of the integrated V_COM op amp.
The Gate High and Low voltages can differ because of
changes in panel size or technology. The BUF08800
supports digital adjustment circuits for the gate voltages.
This feature enables the adjustment of gate voltages
through software without changing hardware, thus
reducing development time and risk.
The BUF08800 is manufactured using Texas Instruments’
proprietary, state-of-the-art, high-voltage CMOS process.
This process allows very dense logic as well as high
supply voltage operation of up to 22V.
The BUF08800 is available in a small TSSOP-20
PowerPad package, and is specified from −40°C to
+85°C.
10−Bit
DAC
10−Bit
DAC
SDA
SCL
Control IF
A0
OUT 7
OUT 8
RELATED PRODUCTS
FEATURES
12-Channel Gamma Correction Buffer
20-Channel Programmable Buffer, 10-Bit, V_COM
16-, 20-Channel Prog. Buffer with Memory
Programmable V_COM Driver
18V Supply, Traditional Gamma Buffers
22V Supply, Traditional Gamma Buffers
PRODUCT
BUF12800
BUF20800
BUF20820
BUF01900
BUF11704
BUF11705
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 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  2007, Texas Instruments Incorporated
www.ti.com