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.