BUF16821 Datasheet, PDF (1/29 Pages) EPCOS – Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory

BUF16821
BUF16821
www.ti.com ...................................................................................................................................................................................................... SBOS428 – JULY 2008
Programmable Gamma-Voltage Generator and
V_COM Calibrator with Integrated Two-Bank Memory
FEATURES
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•234 10-BIT RESOLUTION
• 16-CHANNEL P-GAMMA
• 2-CHANNEL P-V_COM
• 16x REWRITABLE NONVOLATILE MEMORY
• TWO INDEPENDENT PIN-SELECTABLE
MEMORY BANKS
• RAIL-TO-RAIL OUTPUT
– 300mV Min Swing-to-Rail (10mA)
– > 300mA Max I_OUT
• 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
BKSEL
Digital
Analog
(2.0V to 5.5V) (9V to 20V)
1
DESCRIPTION
The BUF16821 offers 16 programmable gamma
channels and two programmable V_COM channels.
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 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 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 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.
OUT1
OUT2
OUT15
OUT16
RELATED PRODUCTS
FEATURES
22-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
BUF12800
BUF20800
BUF20820
BUF01900
BUF11704
BUF11705
SDA
SCL
Control IF
A0
V_COM1
V_COM2
BUF16821
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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.
2
I2C is a trademark of NXP Semiconductors.
3
All other trademarks are the property of their respective owners.
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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, Texas Instruments Incorporated