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REFH OUT
REFH
Digital
(2.0 V to 5.5 V)
Analog
(7V to 18 V)
REFLAOLD
SCL
SDA
REFL OUT
OUT 18
OUT 17
DAC Registers
OUT 1
OUT 2
18 Output Channels plus
Two V
CO M
Channels
BUF20800-Q1
DAC Registers
DAC Registers
V
COM OUT1
V
COM OUT2
Control IFControl IF
BUF20800-Q1
www.ti.com
SBOS571 – AUGUST 2011
18-CHANNEL GAMMA VOLTAGE GENERATOR
WITH TWO PROGRAMMABLE V
COM
CHANNELS
Check for Samples: BUF20800-Q1
1
FEATURES
APPLICATIONS
2
• Qualified for Automotive Applications
• Replaces Resistor-Based Gamma Solutions
• 18-Channel Gamma Correction • TFT-LCD Reference Drivers
• 2-Channel Programmable V
COM
: 50 mA I
OUT
• Dynamic Gamma Control
• 10-Bit Resolution
DESCRIPTION
• Rail-to-Rail Output
The BUF20800-Q1 is a programmable voltage
• Low Supply Current: 900 μA/ch
reference generator designed for gamma correction
• Supply Voltage: 7 V to 18 V
in TFT-LCD panels. It provides 18 programmable
outputs for gamma correction and two channels for
• Digital Supply: 2.0 V to 5.5 V
V
COM
adjustment, each with 10-bit resolution.
• Industry-Standard, Two-Wire Interface: 3.4
MHz High-Speed Mode This programmability replaces the traditional, time
consuming process of changing resistor values to
• Demo Board and Software Available
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 PRODUCT
18-Channel Programmable, Two V
COM
+ OTP Memory BUF20820
12-Channel Programmable Buffer, 10-Bit BUF12800
Programmable V
COM
BUF01900
11-, 6-, 4-Channel Gamma Correction Buffer, 18V BUFxx704
Supply
High-Speed V
COM
, 1 and 2 Channels SN10501
Complete LCD DC/DC Solution 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.
2PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 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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