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BUF22821 Status: ACTIVE

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


      
         
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Datasheet

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Functional Block Diagram


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 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

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.

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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

Reported Distributor Inventory as of 12:14 PM GMT, 25 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksBUF22821AIDCPR
WorldwideDigiKey 806
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** 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

Most useful technical documents for BUF22821 Help

Datasheet

Application Notes

User Guides

More Literature

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Tools & Software

NamePart # Company Tool / Software Type
Analog Filter DesignFILTER-DESIGNERTexas InstrumentsAnalysis Software
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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(TM) Output Buffer Amplifier Selection ToolMDACBUFFERPRO Texas Instruments Application Software 
Active Filter Design ApplicationFILTERPRO Texas Instruments Application Software 

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