BUF22821 Datasheet
Programmable Gamma-Voltage Generator And VCOM Calibrator With Integrated Two-Bank
Download: BUF22821 Datasheet 
BUF22821
Programmable Gamma-Voltage Generator And VCOM Calibrator With Integrated Two-Bank
Burr Brown Products from Texas Instruments
BUF22821
SBOS399 - JUNE 2007
FEATURES
24-CHANNEL GAMMA - 22-CHANNEL PROGRAMMABLE
- 2-CHANNEL STATIC GAMMA
2-CHANNEL PROGRAMMABLE VCOM
10-BIT RESOLUTION
16x REWRITABLE NONVOLATILE MEMORY
TWO INDEPENDENT MEMORY BANKS
RAIL-TO-RAIL OUTPUT
LOW SUPPLY CURRENT: 0.5mA/channel
SUPPLY VOLTAGE: 9V to 20V
DIGITAL SUPPLY: 2V to 5.5V
I2C INTERFACE
Applications
TFT-LCD REFERENCE DRIVERS
Digital
Analog
(2.0V to 5.5V) (9V to 20V)
1 STATOUTH
STATINH
Description
The Buf22821 Offers 22 Programmable Gamma Channels, Two Programmable Vcom Channels, And Two Static
Gamma Channels. It Is Ideal For The New 10-bit Source Drivers That Require 22 Gamma Channels.
The Final Gamma And Vcom Values Can Be Stored In The On-chip, Nonvolatile Memory. To Allow For
Programming Errors Or Liquid Crystal Display (lcd) Panel Rework, The Buf22821 Supports Up To 16
Write Operations To The On-chip Memory. The Buf22821 Has Two Separate Banks Of Memory, Allowing
Simultaneous Storage Of Two Different Gamma Curves To Facilitate Switching Between Gamma Curves.
All Gamma And Vcom Channels Offer A Rail-to-rail Output That Typically Swings To Within 100mv Of
Either Supply Rail With A 10ma Load. All Channels Are Programmed Using An I2c Interface That
Supports Standard Operations Up To 400khz And High-speed Data Transfers Up To 3.4mhz.
The Buf22821 Is Manufactured Using Texas Instruments' Proprietary, State-of-the-art, High-voltage
Cmos Process. This Process Offers Very Dense Logic And High Supply Voltage Operation Of Up To 20v.
The Buf22821 Is Offered In A Htssop-38 Powerpad Package. It Is Specified From -40 C To +85 C.
16x Nonvolatile Memory BANK0 16x Nonvolatile Memory BANK1
DAC Registers
OUT22 STATINL
STATOUTL
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