BUF08821 Datasheet, PDF (1/27 Pages) Texas Instruments – Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory

BUF08821
BUF08821
www.ti.com ................................................................................................................................................. SBOS438C – AUGUST 2008 – REVISED AUGUST 2009
Programmable Gamma-Voltage Generator and
V_COM Calibrator with Integrated Two-Bank Memory
Check for Samples: BUF08821
FEATURES
1
•234 10-BIT RESOLUTION
• 8-CHANNEL P-GAMMA
• 1-CHANNEL P-V_COM
• 16x REWRITABLE NONVOLATILE MEMORY
• TWO INDEPENDENT PIN-SELECTABLE
MEMORY BANKS
• RAIL-TO-RAIL OUTPUT:
300mV Minimum Swing-to-Rail (10mA)
> 300mA Maximum I_OUT
• 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
BKSEL
Digital
Analog
(2.0V to 5.5V) (9V to 20V)
1
OUT1
OUT2
SDA
SCL
Control IF
A0
OUT7
OUT8
V_COM
BUF08821
DESCRIPTION
The BUF08821 offers eight programmable gamma
channels plus one programmable V_COM channel.
The final gamma and V_COM 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 V_COM 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.
RELATED PRODUCTS
FEATURES
22-Channel Gamma Correction Buffer
16-Channel Gamma Correction Buffer
12-Channel Gamma Correction Buffer
18-/20-Channel Programmable Buffer, 10-Bit, V_COM
18-/20-Channel Programmable Buffer with Memory
Programmable V_COM Driver
18V Supply, Traditional Gamma Buffers
22V Supply, Traditional Gamma Buffers
PRODUCT
BUF22821
BUF16821
BUF12800
BUF20800
BUF20820
BUF01900
BUF11704
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.
PowerPAD is a trademark of Texas Instruments, Incorporated.
2
I2C is a trademark of NXP Semiconductors.
3
All other trademarks are the property of their respective owners.
4
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2009, Texas Instruments Incorporated