REFH OUT

REFH

Digital

(2.0 V to 5.5 V)

Analog

(7V to 18 V)

REFL

AO

LD

SCL

SDA

REFL OUT

OUT 18

OUT 17

OUT 1

OUT 2

18 Output Channels plus

Two V

BUF20800-Q1

V

CO M OUT1

V

CO M OUT2

Control IF

Control IF

BUF20800-Q1

www.ti.com

SBOS571

– AUGUST 2011

18-CHANNEL GAMMA VOLTAGE GENERATOR

Check for Samples: BUF20800-Q1

1

FEATURES

APPLICATIONS

2

•

Qualified for Automotive Applications

•

Replaces Resistor-Based Gamma Solutions

•

18-Channel Gamma Correction

•

TFT-LCD Reference Drivers

•

•

Dynamic Gamma Control

•

10-Bit Resolution

DESCRIPTION

•

Rail-to-Rail Output

The

BUF20800-Q1

is

a

programmable

voltage

•

Low Supply Current: 900

μA/ch

reference generator designed for gamma correction

•

Supply Voltage: 7 V to 18 V

in TFT-LCD panels. It provides 18 programmable

outputs for gamma correction and two channels for

•

Digital Supply: 2.0 V to 5.5 V

•

Industry-Standard, Two-Wire Interface: 3.4

MHz High-Speed Mode

This programmability replaces the traditional, time

consuming process of changing resistor values to

•

Demo Board and Software Available

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-Q1 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-Q1

offers a high-speed mode that allows clock speeds up

to 3.4 MHz.

For lower channel count, please contact your local

sales or marketing representative.

The BUF20800-Q1 is available in an HTSSOP-38

PowerPAD

™ package. It is specified from −40°C to

+105

°C.

RELATED PRODUCTS

FEATURES

PRODUCT

BUF20820

12-Channel Programmable Buffer, 10-Bit

BUF12800

BUF01900

11-, 6-, 4-Channel Gamma Correction Buffer, 18V

BUFxx704

Supply

SN10501

Complete LCD DC/DC Solution

TPS65100

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

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright

© 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.