1FEATURES

234• 10-BIT RESOLUTION

• 16-CHANNEL P-GAMMA

• 2-CHANNEL P-VCOM

• 16x REWRITABLE NONVOLATILE MEMORY

• TWO INDEPENDENT PIN-SELECTABLE

MEMORY BANKS

• RAIL-TO-RAIL OUTPUT

– 300mV Min Swing-to-Rail (10mA)

– > 300mA Max IOUT

• LOW SUPPLY CURRENT

• SUPPLY VOLTAGE: 9V to 20V

• DIGITAL SUPPLY: 2V to 5.5V

• I2C™ INTERFACE: Supports 400kHz and

3.4MHz

APPLICATIONS

• TFT-LCD REFERENCE DRIVERS

DESCRIPTION

The BUF16821 offers 16 programmable gamma

channels and two programmable VCOM 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 BUF16821 supports up to 16 write operations to the on-chip memory.

The BUF16821 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 BUF16821 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

BUF16821 is offered in a HTSSOP-28 PowerPAD™

package, and is specified from –40°C to +85°C.