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See Technical Specifications

BUF22821AIDCPR

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

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

BUF22821AIDCPR
Datasheet:

BUF22821AIDCPR Datasheet (PDF)
Applications:

TFT-LCD Panels: Gamma Buffer, VCOM Driver
Output Type:

Rail-to-Rail
Number of Circuits:

24
Current - Supply:

12 mA
EDA/CAD Models:

Request Free CAD Models for BUF22821AIDCPR

Email: [email protected]

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Tel: +852 95804164

BUF22821AIDCPR General Description

The BUF22821 offers 22 programmable gamma channels, two programmable V_COM 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 V_COM 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 V_COM 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.

Key Features

24-CHANNEL GAMMA
- 22-CHANNEL PROGRAMMABLE
- 2-CHANNEL STATIC GAMMA
2-CHANNEL PROGRAMMABLE V_COM
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.

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersVideo Amps and Modules	Series	-
Applications	TFT-LCD Panels: Gamma Buffer, VCOM Driver	Output Type	Rail-to-Rail
Number of Circuits	24	Slew Rate	-
Current - Supply	12 mA	Current - Output / Channel	30 mA
Voltage - Supply, Single/Dual (±)	9V ~ 20V	Mounting Type	Surface Mount
Base Product Number	BUF22821