BUF20800-Q1 Datasheet, PDF (1/32 Pages) Texas Instruments – 18-CHANNEL GAMMA VOLTAGE GENERATOR WITH TWO PROGRAMMABLE VCOM CHANNELS

BUF20800-Q1
www.ti.com
18-CHANNEL GAMMA VOLTAGE GENERATOR
WITH TWO PROGRAMMABLE V_COM CHANNELS
Check for Samples: BUF20800-Q1
SBOS571 – AUGUST 2011
FEATURES
1
•2 Qualified for Automotive Applications
• 18-Channel Gamma Correction
• 2-Channel Programmable V_COM: 50 mA I_OUT
• 10-Bit Resolution
• Rail-to-Rail Output
• Low Supply Current: 900 μA/ch
• Supply Voltage: 7 V to 18 V
• Digital Supply: 2.0 V to 5.5 V
• Industry-Standard, Two-Wire Interface: 3.4
MHz High-Speed Mode
• Demo Board and Software Available
Ana log
(7V to 18 V)
Digita l
(2.0 V to 5.5 V) REFH
BUF20800-Q1
REFH OUT
V_{CO M OUT1}
V_{CO M OUT2}
OUT 1
OUT 2
18 Output Channels plus
Two V_COM Channels
OUT 17
SDA
SCL
CCoonnttrrooll IFIF
LD
AO
REFL
OUT 18
REFL OUT
APPLICATIONS
• Replaces Resistor-Based Gamma Solutions
• TFT-LCD Reference Drivers
• Dynamic Gamma Control
DESCRIPTION
The BUF20800-Q1 is a programmable voltage
reference generator designed for gamma correction
in TFT-LCD panels. It provides 18 programmable
outputs for gamma correction and two channels for
V_COM adjustment, each with 10-bit resolution.
This programmability replaces the traditional, time
consuming process of changing resistor values to
optimize the various gamma voltages and allows
designers to determine the correct gamma voltages
for a panel very quickly. Required changes can also
be easily implemented without hardware changes.
The BUF20800-Q1 uses TI’s latest, small-geometry
analog CMOS process, which makes it a very
competitive choice for full production, not just
evaluation.
Programming of each output occurs through an
industry standard, two-wire serial interface. Unlike
existing programmable buffers, the BUF20800-Q1
offers a high-speed mode that allows clock speeds up
to 3.4 MHz.
For lower channel count, please contact your local
sales or marketing representative.
The BUF20800-Q1 is available in an HTSSOP-38
PowerPAD™ package. It is specified from −40°C to
+105°C.
RELATED PRODUCTS
FEATURES
18-Channel Programmable, Two V_COM + OTP Memory
12-Channel Programmable Buffer, 10-Bit
Programmable V_COM
11-, 6-, 4-Channel Gamma Correction Buffer, 18V
Supply
High-Speed V_COM, 1 and 2 Channels
Complete LCD DC/DC Solution
PRODUCT
BUF20820
BUF12800
BUF01900
BUFxx704
SN10501
TPS65100
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
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 © 2011, Texas Instruments Incorporated