BUF22821
22-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory
BUF22821
- 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.
Technical documentation
| 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.
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.
SBOC417 — BUF22821EVM-USB User Software
Supported products & hardware
Products
LCD & OLED display power & drivers
Hardware development
Evaluation board
SBOC418 — BUF22821EVM-USB Source Code
Supported products & hardware
Products
LCD & OLED display power & drivers
Hardware development
Evaluation board
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (DCP) | 38 | Ultra Librarian |
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Support & training
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