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BUF22821 Datasheet Preview

BUF22821 Datasheet

Programmable Gamma-Voltage Generator

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BUF22821
BUF22821
www.ti.com
SBOS399D JUNE 2007 REVISED JULY 2011
Programmable Gamma-Voltage Generator and
VCOM Calibrator with Integrated Two-Bank Memory
Check for Samples: BUF22821
FEATURES
1
234 24-CHANNEL GAMMA
22-CHANNEL PROGRAMMABLE
2-CHANNEL STATIC GAMMA
2-CHANNEL PROGRAMMABLE VCOM
10-BIT RESOLUTION
16x REWRITABLE NONVOLATILE MEMORY
TWO INDEPENDENT MEMORY BANKS
RAIL-TO-RAIL OUTPUT
LOW SUPPLY CURRENT: 0.5mA/channel
SUPPLY VOLTAGE: 9V to 20V
DIGITAL SUPPLY: 2V to 5.5V
I2CINTERFACE
APPLICATIONS
TFT-LCD REFERENCE DRIVERS
BKSEL
Digital
Analog
(2.0V to 5.5V) (9V to 20V)
1
STATOUTH
STATINH
AVDD
OUT1
DESCRIPTION
The BUF22821 offers 22 programmable gamma
channels, two programmable VCOM channels, and two
static gamma channels. It is ideal for the new 10-bit
source drivers that require 22 gamma 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 BUF22821 supports up to 16 write
operations to the on-chip memory. The BUF22821
has two separate banks of memory, 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 100mV 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 BUF22821 is manufactured using Texas
Instrumentsproprietary, state-of-the-art, high-voltage
CMOS process. This process offers very dense logic
and high supply voltage operation of up to 20V. The
BUF22821 is offered in a HTSSOP-38 PowerPAD
package. It is specified from 40°C to +85°C.
OUT2
OUT21
OUT22
STATINL
STATOUTL
AVDD
VCOM1
RELATED PRODUCTS
FEATURES
12-Channel Gamma Correction Buffer
20-Channel Programmable Buffer, 10-Bit, VCOM
16-/20-Channel Programmable Buffer with Memory
Programmable VCOM Driver
18V Supply, Traditional Gamma Buffers
22V Supply, Traditional Gamma Buffers
PRODUCT
BUF12800
BUF20800
BUF20820
BUF01900
BUF11704
BUF11705
SDA
SCL
Control IF
A0
VCOM2
BUF22821
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.
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 © 20072011, Texas Instruments Incorporated




etcTI

BUF22821 Datasheet Preview

BUF22821 Datasheet

Programmable Gamma-Voltage Generator

No Preview Available !

BUF22821
SBOS399D JUNE 2007 REVISED JULY 2011
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PRODUCT
BUF22821
PACKAGE/ORDERING INFORMATION(1)
PACKAGE
PACKAGE DESIGNATOR
HTSSOP-38
DCP
PACKAGE MARKING
BUF22821
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range (unless otherwise noted).
Supply Voltage, VS
Supply Voltage, VSD
Digital Input Terminals, SCL, SDA, AO, BKSEL: Voltage
Digital Input Terminals, SCL, SDA, AO, BKSEL: Current
Analog Input Terminals, STATINL, STATINH: Voltage
Analog Input Terminals, STATINL, STATINH: Current
Output Short-Circuit(2)
Operating Temperature
Storage Temperature
Junction Temperature
Human Body Model
ESD Ratings Charged-Device Model
Machine Model
BUF22821
+22
+6
0.5 to +6
±10
0.5 to VS + 0.5
±10
Continuous
40 to +95
65 to +150
+125
4000
1000
200
UNIT
V
V
V
mA
V
mA
°C
°C
°C
V
V
V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
(2) Short-circuit to ground, one channel at a time.
2
Copyright © 20072011, Texas Instruments Incorporated


Part Number BUF22821
Description Programmable Gamma-Voltage Generator
Maker etcTI
Total Page 3 Pages
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