1FEATURES

234• 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

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.