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.

FEATURES

• 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