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Product details

Parameters

Display type LCD unipolar IC integration Gamma buffer, VCOM Vin (Min) (V) 9 Vin (Max) (V) 20 Source driver voltage (Min) (V) 9 Source driver voltage (Max) (V) 20 Level shifter/scan driver (ch) 0 Special function Gamma buffer, I2C interface, VCOM or op amp Rating Catalog open-in-new Find other LCD & OLED display power & drivers

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other LCD & OLED display power & drivers

Features

  • 10-BIT RESOLUTION
  • 8-CHANNEL P-GAMMA
  • 1-CHANNEL P-VCOM
  • 16x REWRITABLE NONVOLATILE MEMORY
  • TWO INDEPENDENT PIN-SELECTABLE MEMORY BANKS
  • RAIL-TO-RAIL OUTPUT:
    300mV Minimum Swing-to-Rail (10mA)
    > 300mA Maximum IOUT
  • LOW SUPPLY CURRENT
  • SUPPLY VOLTAGE: 9V to 20V
  • DIGITAL SUPPLY: 2V to 5.5V
  • I2C INTERFACE: Supports 400kHz and 3.4MHz Clock Frequency
  • APPLICATIONS
    • TFT-LCD REFERENCE DRIVERS
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Description

The BUF08821 offers eight programmable gamma channels plus one programmable VCOM channel.

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 BUF08821 supports up to 16 write operations to the on-chip memory.

The BUF08821 has two separate memory banks, 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 150mV 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 BUF08821 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 BUF08821 is offered in a HTSSOP-20 PowerPAD package. It is specified from –40°C to +85°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet Prog. Gamma-Voltage Generator & Vcom Calibrator w/ Integrated 2-Bank Memory datasheet (Rev. D) Jul. 12, 2011
User guide BUF08821EVM-USB User's Guide (Rev. A) Aug. 02, 2016
Application note Driving Capacitive Loads with Gamma Buffers Nov. 20, 2012
User guide BUF08821EVM User's Guide Sep. 24, 2008

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
BUF08821EVM-USB
BUF08821EVM-USB
149
Description

The BUF08821EVM is a platform for evaluating the performance of the BUF08821 gamma-voltage generator under various signal, reference and supply conditions. This device offers 8 programmable gamma channels, 1 programmable Vcom channels, and integrated 2 bank memory.

Features
  • DUT socket for easy part replacement
  • Switch or external memory bank selection

Software development

SUPPORT SOFTWARE Download
SBOC269.ZIP (2961 KB)
SUPPORT SOFTWARE Download
SBOC403.ZIP (83023 KB)
SUPPORT SOFTWARE Download
SBOC404.ZIP (1692 KB)

Design tools & simulation

SIMULATION MODEL Download
SBOM409.ZIP (39 KB) - IBIS Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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