BUF22821

ACTIVE

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

Product details

Display type LCD unipolar IC integration Gamma buffer, VCOM Vin (min) (V) 9 Vin (max) (V) 20 Applications 13 to 21 inches, 21 inches and above, 7 inches or less, 7 to 13 inches Source driver voltage (min) (V) 9 Source driver voltage (max) (V) 20 Level shifter/scan driver (Ch) 0 Features Gamma buffer, I2C interface, VCOM or op amp Rating Catalog Operating temperature range (°C) -40 to 95
Display type LCD unipolar IC integration Gamma buffer, VCOM Vin (min) (V) 9 Vin (max) (V) 20 Applications 13 to 21 inches, 21 inches and above, 7 inches or less, 7 to 13 inches Source driver voltage (min) (V) 9 Source driver voltage (max) (V) 20 Level shifter/scan driver (Ch) 0 Features Gamma buffer, I2C interface, VCOM or op amp Rating Catalog Operating temperature range (°C) -40 to 95
HTSSOP (DCP) 38 62.08 mm² 9.7 x 6.4
  • 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.

  • 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.

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.

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.

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Technical documentation

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Type Title Date
* Data sheet Programmable Gamma-Voltage Generator and Vcom Calibrator with Two-Bank Memory datasheet (Rev. D) 12 Jul 2011
EVM User's guide BUF22821EVM-USB Users Guide (Rev. A) 31 May 2016
Application note Driving Capacitive Loads with Gamma Buffers 20 Nov 2012
More literature BUF22821EVM Thank You Letter 21 Dec 2007
EVM User's guide BUF22821EVM Evaluation Board User's Guide / Software Tutorial 11 Sep 2007

Design & development

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

Evaluation board

BUF22821EVM-USB — BUF22821 Evaluation board

The BUF22821EVM-USB is a platform for evaluating the performance of the BUF22821 gamma-voltage generator under various signal, reference and supply conditions.

This device offers 22 programmable gamma channels, each with 10 bit resolution.

User guide: PDF
Not available on TI.com
Support software

SBOC245 BUF22821EVM Software

Supported products & hardware

Supported products & hardware

Products
LCD & OLED display power & drivers
BUF22821 22-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory
Support software

SBOC417 BUF22821EVM-USB User Software

Supported products & hardware

Supported products & hardware

Products
LCD & OLED display power & drivers
BUF22821 22-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory
Hardware development
Evaluation board
BUF22821EVM-USB BUF22821 Evaluation board
Support software

SBOC418 BUF22821EVM-USB Source Code

Supported products & hardware

Supported products & hardware

Products
LCD & OLED display power & drivers
BUF22821 22-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory
Hardware development
Evaluation board
BUF22821EVM-USB BUF22821 Evaluation board
Simulation model

Gamma Buffer I2C IBIS Model

SBOM409.ZIP (39 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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HTSSOP (DCP) 38 View options

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