TI Home > Semiconductors > Amplifiers and Linear > Operational Amplifiers > Precision Amplifiers > LCD Gamma Buffers >

BUF22821 Status: ACTIVE

Programmable Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory

      
         
Alert me about changes<br/>to this product

Datasheet

Download - PDF Icon
  • Programmable Gamma-Voltage Generator and Vcom Calibrator with Two-Bank Memory (Rev. B) (buf22821.pdf, 945 KB)
    05 Feb 2008 Download

 BUF22821
# Gamma Buffers24  
# Vcom Channels2  
Vs(Min)(V)9  
Vs(Max)(V)20  
Iq per channel(Typ)(mA)0.5  
Vcom-Output Current(Typ)(mA)100  
Gamma-Output Current(Typ)(mA)30  
Pin/Package38HTSSOP  
Number of Channels22  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

  • BUF20800: 18-Channel Gamma Voltage Generator with Two Programmable VCOM Channels

Product Information

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

PowerPAD Is a trademark of Texas Instruments.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners

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.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusPrice | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsSamples
BUF22821AIDCPRACTIVE3.25 | 1kuHTSSOP (DCP) | 38 View 2000 | LARGE T&R Download CAD Format for this SymbolContact TI Distributor or Sales Office

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

  TI Inventory Status Reported Distributor Inventory
BUF22821AIDCPRAs of 10:11 AM GMT, 04 Dec 2008As of 10:11 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 >10k* 393 | 9 Dec 6 Weeks AmericasDigiKey >1k
 >10k | 5 Jan     
View all Distributors  

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
BUF22821AIDCPR RoHS Compliant Pb-Free (RoHS) CU NIPDAU Level-3-260C-168 HRViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

  • Programmable Gamma-Voltage Generator and Vcom Calibrator with Two-Bank Memory (Rev. B) (buf22821.pdf, 945 KB)
    05 Feb 2008 Download

Application Notes

  • Shelf-Life Evaluation of Lead-Free Component Finishes (szza046.htm, 8 KB)
    24 May 2004 Abstract
  • Thermal and Electrical Properties of Selected Packaging Materials (sbfa010.htm, 8 KB)
    04 Oct 2000 Abstract

User Guides

  • BUF22821EVM Evaluation Board User's Guide / Software Tutorial (sbou053.pdf, 6038 KB)
    11 Sep 2007 Download

More Literature

  • BUF22821EVM Thank You Letter (sbol001.pdf, 23 KB)
    21 Dec 2007 Download

View More Literature for LCD Gamma Buffers

Tools & Software

NamePart # Company Tool / Software Type
Analog Filter DesignFILTER-DESIGNERTexas InstrumentsAnalysis Software
Automatic Resistor/Capacitor Calculator for Passive FiltersRC-FILTER-CALCTexas InstrumentsCalculation Utilities
Decibel CalculatorDECIBEL-CALCTexas InstrumentsCalculation Utilities
Frequency/Wavelength CalculatorFREQ-WAVE-CALCTexas InstrumentsCalculation Utilities
Noise Calculator, Generator and ExamplesOPAMP-NOISECALCTexas InstrumentsCalculation Utilities
Op Amp Gain Stage CalculatorGAIN-STAGE-CALCTexas InstrumentsCalculation Utilities
Resistor Calculator for Op Amp Gain and Zero ShiftRESISTOR-CALCTexas InstrumentsCalculation Utilities
BUF2281EVM Evaluation ModuleBUF22821EVMTexas InstrumentsDevelopment Boards/EVMs
Universal EVM for Single/Dual OpAmps without Shutdown in MSOP/SOIC/SOT-23 PackagesOPAMPEVM-SOT23Texas InstrumentsDevelopment Boards/EVMs
SPICE-Based Analog Simulation ProgramTINA-TITexas InstrumentsSimulators
MDACBufferPro Output Buffer Amplifier Selection ToolMDACBUFFERPRO Texas Instruments Application Software 
Active Filter Design ApplicationFILTERPRO Texas Instruments Application Software 
  • BUF22821EVM Software (sboc245.zip, 2935 KB )
               11 Sep 2007 zip

 Alternative Products - Are similar to BUF22821
Customers Who Evaluated This Product Also Evaluated...
Part #Name Comments
BUF2080018-Channel Gamma Voltage Generator with Two Programmable VCOM ChannelsTI customers also evaluated this product.

Support and Community

Customer Tags Help

No Tags are Available for this Part Number

Other Support