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BUF20800-Q1 Datasheet Preview

BUF20800-Q1 Datasheet

18-Channel Programmable Gamma Voltage Generator

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BUF20800-Q1
SBOS571C – AUGUST 2011 – REVISED AUGUST 2018
BUF20800-Q1 18-Channel Programmable Gamma Voltage Generator
With Two Programmable VCOM Channels
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C4
• Low Supply Current: 900 μA/ch
• Analog Supply Voltage: 7 V to 18 V
• Digital Supply Voltage: 2 V to 5.5 V
• 18-Channel Gamma Correction
• 2-Channel Programmable VCOM: 50 mA IOUT
• 10-Bit Resolution
• Rail-to-Rail Output
• I2C Interface
– 3.4 MHz High-Speed Mode
• Demo Board and Software Available
Device Information (1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BUF20800-Q1
HTSSOP (38)
9.80 mm × 9.60 mm
Related Products
FEATURES
12-Channel Programmable Buffer, 10-Bit
Programmable VCOM
11-, 6-, 4-Channel Gamma Correction Buffer, 18V
Supply
High-Speed VCOM, 1 and 2 Channels
Complete LCD DC/DC Solution
PRODUCT
BUF12800
BUF01900
BUFxx704
SN10501
TPS65100
Simplified Block Diagram
Ana log
(7V to 18 V)
Digita l
(2.0 V to 5.5 V) REFH
BUF20800-Q1
2 Applications
• Replaces Resistor-Based Gamma Solutions
• TFT-LCD Reference Drivers
• Dynamic Gamma Control
3 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
VCOM adjustment, each with 10-bit resolution.
All channels are programmable using an I2C interface
that supports high-speed data transfers up to 3.4
MHz.
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 are 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.
For lower channel count, please contact your local
sales or marketing representative.
The BUF20800-Q1 is available in an HTSSOP-38
package withPowerPAD™. It is specified from 40°C
to +105°C.
1
REFH OUT
VCO M OUT1
VCO M OUT2
OUT 1
OUT 2
18 Output Channels plus
Two VCOM Channels
OUT 17
SDA
SCL
CCoonnttrrooll IFIF
OUT 18
REFL OUT
LD
AO
REFL
Copyright © 2016, Texas Instruments Incorporated
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

BUF20800-Q1 Datasheet Preview

BUF20800-Q1 Datasheet

18-Channel Programmable Gamma Voltage Generator

No Preview Available !

BUF20800-Q1
SBOS571C – AUGUST 2011 – REVISED AUGUST 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings .................................... 4
6.2 ESD Ratings ............................................................ 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information ................................................. 5
6.5 Electrical Characteristics........................................... 6
6.6 Typical Characteristics .............................................. 8
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 13
7.5 Programming........................................................... 15
8 Application and Implementation ........................ 21
8.1 Application Information............................................ 21
8.2 Typical Application ................................................. 21
9 Power Supply Recommendations...................... 28
10 Layout................................................................... 28
10.1 Layout Guidelines ................................................. 28
10.2 Layout Example .................................................... 31
11 Device and Documentation Support ................. 32
11.1 Documentation Support ....................................... 32
11.2 Receiving Notification of Documentation Updates 32
11.3 Community Resources.......................................... 32
11.4 Trademarks ........................................................... 32
11.5 Electrostatic Discharge Caution ............................ 32
11.6 Glossary ................................................................ 32
12 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (January 2018) to Revision C
Page
• Changed OUT1-9 high output swing MIN number from "17.7" to "17.6"................................................................................ 6
• Added OUT1-9 high output swing for TA = +25°C" ................................................................................................................ 6
Changes from Revision A (November 2017) to Revision B
Page
• Added INL spec over temperature.......................................................................................................................................... 6
• Added R1 and R2 callouts and corrected capacitor '10mF' value to '10µF' in Typical Application Configuration ............... 22
Changes from Original (August 2011) to Revision A
Page
• Reformat to new TI standard: Added Device Information table, Pin Configuration and Functions section,
Specifications section, Feature Description section, Device Functional Modes section, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section................................................................ 1
• Changed to "Code 978" from "Code 1023" ............................................................................................................................ 6
• Changed to "Code 32" from "Code 00" .................................................................................................................................. 6
• Added MAX value for "OUT 10-18 output swing : low " parameter........................................................................................ 6
2
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Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: BUF20800-Q1


Part Number BUF20800-Q1
Description 18-Channel Programmable Gamma Voltage Generator
Maker etcTI
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