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BUF22821

更新时间： 2024-11-13 03:23:11
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德州仪器 - TI /
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25页 752K
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Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory

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BUF22821  
SBOS399–JUNE 2007  
Programmable Gamma-Voltage Generator and  
VCOM Calibrator with Integrated Two-Bank Memory  
FEATURES  
DESCRIPTION  
•
24-CHANNEL GAMMA  
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.  
–
–
22-CHANNEL PROGRAMMABLE  
2-CHANNEL STATIC GAMMA  
•
•
•
•
•
•
•
•
•
2-CHANNEL PROGRAMMABLE VCOM  
10-BIT RESOLUTION  
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.  
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  
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.  
APPLICATIONS  
•
TFT-LCD REFERENCE DRIVERS  
Analog  
Digital  
BKSEL  
(9V to 20V)  
(2.0V to 5.5V)  
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.  
1
STATOUTH  
STATINH  
AVDD  
OUT1  
OUT2  
RELATED PRODUCTS  
FEATURES  
PRODUCT  
BUF12800  
BUF20800  
BUF20820  
BUF01900  
BUF11704  
BUF11705  
OUT21  
OUT22  
12-Channel Gamma Correction Buffer  
20-Channel Programmable Buffer, 10-Bit, VCOM  
16-/20-Channel Programmable Buffer with Memory  
Programmable VCOM Driver  
STATINL  
AVDD  
18V Supply, Traditional Gamma Buffers  
22V Supply, Traditional Gamma Buffers  
STATOUTL  
VCOM1  
VCOM2  
SDA  
SCL  
Control IF  
BUF22821  
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.  
I2C is a trademark of NXP Semiconductors.  
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 the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2007, Texas Instruments Incorporated  
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