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BUF22821 Status: ACTIVE

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


      
         
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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

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    • 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

    Reported Distributor Inventory as of 12:05 PM GMT, 08 Nov 2009
    RegionCompanyIn StockPurchase
    TI Lead Time*: 4 WeeksBUF22821AIDCPR
    WorldwideDigiKey 806
    View all Distributors  

    ** 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

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    TPS3825-33 Processor Supervisory Circuits POWER MANAGEMENT-SUPERVISORY CIRCUITS(VOLTAGE SUPERVISORS) TI customers also evaluated this product.
    LP2985-50 Single Output LDO, 150mA, Fixed(5.0V), 1.5% Tolerance, Low Quiescent Current, Low Noise LINEAR REGULATORS-SINGLE CHANNEL LDO TI customers also evaluated this product.
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