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BUF16821
Analog
(9Vto20V)
Digital
(2.0Vto5.5V)
BKSEL
A0
SCL
SDA
V
COM
2
V
COM
1
DACRegisters
ControlIF
OUT15
OUT16
¼
¼
¼
BUF16821
16xNonvolatileMemoryBANK1
16xNonvolatileMemoryBANK0
OUT1
OUT2
DACRegisters
1
¼
¼
BUF16821
www.ti.com
SBOS428C –JULY 2008– REVISED JULY 2011
Programmable Gamma-Voltage Generator and
V
COM
Calibrator with Integrated Two-Bank Memory
Check for Samples: BUF16821
1
FEATURES
DESCRIPTION
The BUF16821 offers 16 programmable gamma
234
• 10-BIT RESOLUTION
channels and two programmable V
COM
channels.
• 16-CHANNEL P-GAMMA
The final gamma and V
COM
values can be stored in
• 2-CHANNEL P-V
COM
the on-chip, nonvolatile memory. To allow for
• 16x REWRITABLE NONVOLATILE MEMORY
programming errors or liquid crystal display (LCD)
• TWO INDEPENDENT PIN-SELECTABLE
panel rework, the BUF16821 supports up to 16 write
MEMORY BANKS
operations to the on-chip memory.
• RAIL-TO-RAIL OUTPUT
The BUF16821 has two separate memory banks,
– 300mV Min Swing-to-Rail (10mA)
allowing simultaneous storage of two different gamma
– > 300mA Max I
OUT
curves to facilitate switching between gamma curves.
• LOW SUPPLY CURRENT
All gamma and V
COM
channels offer a rail-to-rail
• SUPPLY VOLTAGE: 9V to 20V
output that typically swings to within 150mV of either
• DIGITAL SUPPLY: 2V to 5.5V
supply rail with a 10mA load. All channels are
• I
2
C™ INTERFACE: Supports 400kHz and
programmed using an I
2
C interface that supports
3.4MHz
standard operations up to 400kHz and high-speed
data transfers up to 3.4MHz.
APPLICATIONS
The BUF16821 is manufactured using Texas
• TFT-LCD REFERENCE DRIVERS
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.
RELATED PRODUCTS
FEATURES PRODUCT
22-Channel Gamma Correction Buffer BUF22821
12-Channel Gamma Correction Buffer BUF12800
18-/20-Channel Programmable Buffer, 10-Bit, V
COM
BUF20800
18-/20-Channel Programmable Buffer with Memory BUF20820
Programmable V
COM
Driver BUF01900
18V Supply, Traditional Gamma Buffers BUF11704
22V Supply, Traditional Gamma Buffers BUF11705
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2PowerPAD is a trademark of Texas Instruments.
3I
2
C is a trademark of NXP Semiconductors.
4All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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