V

SD

BKSEL

SCL

SDA

Control(IFandMemory)

OUT9

BUF12840

OUT0

OUT1

1

OUT10

OUT11

V

S

External

Memory

Control

EN

EA1

EA0

A0

LD

BUF12840

www.ti.com

SBOS519A

– OCTOBER 2010 – REVISED JULY 2011

Programmable Gamma-Voltage Generator

with Integrated Two-Bank Memory and External EEPROM

1

FEATURES

DESCRIPTION

The BUF12840 offers 12 programmable gamma

2

•

10-BIT RESOLUTION

channels

with

external

electrically

erasable

•

12-CHANNEL P-GAMMA

programmable read-only memory (EEPROM) read

•

READS FROM EXTERNAL EEPROM

capabilities.

•

TWO INDEPENDENT PIN-SELECTABLE

The BUF12840 has two separate memory banks that

MEMORY BANKS

allow simultaneous storage of two different gamma

•

RAIL-TO-RAIL OUTPUT:

curves to facilitate switching between gamma curves.

– 300mV Min Swing-to-Rail (10mA)

All gamma channels offer a rail-to-rail output that

– 200mV Min Swing-to-Rail (5mA)

typically swings to within 200mV of either supply rail

•

LOW SUPPLY CURRENT

with a 5mA load. All channels are programmed using

•

SUPPLY VOLTAGE: 9V to 20V

a two-wire interface that supports standard operations

up to 400kHz and high-speed data transfers up to

•

DIGITAL SUPPLY: 2V to 5.5V

3.4MHz.

•

TWO-WIRE INTERFACE: Supports 400kHz and

3.4MHz Operation

The

BUF12840

is

manufactured

using

Texas

Instruments

’ proprietary, state-of-the-art, high-voltage

APPLICATIONS

CMOS process. This process offers very dense logic

and high supply voltage operation of up to 20V. The

•

TFT-LCD REFERENCE DRIVERS

BUF12840 is offered in a QFN-24 package, and is

specified from

–40°C to +95°C.

RELATED PRODUCTS

FEATURES

PRODUCT

22-Channel Gamma Correction Buffer

BUF22821

12-Channel Gamma Correction Buffer

BUF12800

BUF20800

16-/20-Channel Programmable Buffer with Memory

BUF20820

BUF01900

18V Supply, Traditional Gamma Buffers

BUF11704

22V Supply, Traditional Gamma Buffers

BUF11705

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2010–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.