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BUF20820 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BUF20820
기능 18-Channel GAMMA VOLTAGE GENERATOR
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BUF20820 데이터시트, 핀배열, 회로
BUF20820
SBOS330C − DECEMBER 2005 − REVISED OCTOBER 2006
18-Channel GAMMA VOLTAGE GENERATOR
with Two Programmable VCOM Channels
FEATURES
D 18-CHANNEL GAMMA CORRECTION
D 2-CHANNEL PROGRAMMABLE VCOM:
100mA IOUT
D ON-CHIP OTP MEMORY
D 10-BIT RESOLUTION
D RAIL-TO-RAIL OUTPUT
D LOW SUPPLY CURRENT: 900µA/ch
D SUPPLY VOLTAGE: 7V to 18V
D DIGITAL SUPPLY: 2.0V to 5.5V
D INDUSTRY-STANDARD, TWO-WIRE
INTERFACE: 3.4MHz HIGH-SPEED MODE
D HIGH ESD RATING:
4kV HBM, 1kV CDM, 200V MM
D DEMO BOARD AND SOFTWARE AVAILABLE
www.DataSheet4U.com
2V−5.5V
Digital
BUF20820
7V−18V
Analog
REFH
SDA
SCL
Control IF
LD AO
REFH OUT
OUT 1
OUT 2
18 Output Channels plus
Two VCOM Channels
OUT 17
OUT 18
VCOM OUT1
VCOM OUT2
REFL OUT
REFL
APPLICATIONS
D REPLACES RESISTOR-BASED GAMMA
SOLUTIONS
D TFT-LCD REFERENCE DRIVERS
D DYNAMIC GAMMA CONTROL
DESCRIPTION
The BUF20820 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. It offers on-chip One-Time
Programmable (OTP) memory that allows the user to store
the gamma voltages on-chip. This eliminates the need for
an external EEPROM.
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 voltage changes can also be easily
implemented without hardware changes.
The BUF20820 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 BUF20820 offers a high-speed
mode that allows clock speeds up to 3.4MHz.
For lower or higher channel count, please contact your
local sales or marketing representative.
The BUF20820 is available in an HTSSOP-38
PowerPADpackage. It is specified from −40°C to +85°C.
BUF20820 RELATED PRODUCTS
FEATURES
18-Channel Programmable, Two VCOM
12-Channel Programmable Buffer, 10-Bit
Programmable VCOM with Memory
10-Channel Gamma Correction Buffer, Int VCOM,
18V Operating Supply Voltage
High-Speed VCOM, 1 and 2 Channels
Complete LCD DC/DC Solution
PRODUCT
BUF20800
BUF12800
BUF01900
BUF11704
SN10501
TPS651xx
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 registered trademark of Texas Instruments. All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2005−2006, Texas Instruments Incorporated
www.ti.com




BUF20820 pdf, 반도체, 판매, 대치품
BUF20820
SBOS330C − DECEMBER 2005 − REVISED OCTOBER 2006
PIN CONFIGURATIONS
Top View
VCOM OUT 2
REFH
1
2
NC(1) 3
NC(1) 4
OUT1 5
OUT2 6
OUT3 7
OUT4 8
OUT5 9
OUT6 10
GNDA(2) 11
VS 12
OUT7 13
OUT8 14
OUT9 15
REFH OUT 16
VSD 17
SCL 18
SDA 19
PowerPAD
Lead−Frame
Die Pad
Exposed on
Underside
38 VCOM OUT 1
37 REFL
36 NC(1)
35 NC(1)
34 REFL OUT
33 OUT18
32 OUT17
31 OUT16
30 OUT15
29 OUT14
28 GNDA(2)
27 VS
26 OUT13
25 OUT12
24 OUT11
23 OUT10
22 GNDD(2)
21 LD
20 AO
(1) NC denotes no connection.
(2) GNDD and GNDA are internally connected and must be at the same voltage potential.
www.ti.com
HTSSOP
4

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BUF20820 전자부품, 판매, 대치품
www.ti.com
BUF20820
SBOS330C − DECEMBER 2005 − REVISED OCTOBER 2006
BUF20820
(1)
VCOM 1
1 VCOM OUT2
VCOM OUT1 38
VS
2 REFH
REFL 37
3 NC
NC 36
(1)
VCO M2
VS
Source
Driver
(1)
(1)
(1)
(1)
(1)
(1)
4 NC
5 OUT1
6 OUT2
7 OUT3
8 OUT4
9 OUT5
10 OUT6
NC 35
REFL OUT 34
OUT18 33
OUT17 32
OUT16 31
OUT15 30
OUT14 29
(1)
(1)
(1)
(1)
(1)
Source
Driver
VS
Source
Driver
11 GNDA(2)
100nF
12 VS
10µF
(1)
13 OUT7
(1)
14 OUT8
(1)
15 OUT9
16 REFH OUT
GNDA(2) 28
VS 27
OUT13 26
100nF
(1)
VS
10µF
OUT12 25
OUT11 24
(1)
(1)
Source
Driver
OUT10 23
(1)
3.3V
17 VSD
1µF 100nF
Timing
Controller
18 SCL
19 SDA
GNDD(2) 22
LD 21
AO 20
Figure 8. Typical Application Configuration
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관련 데이터시트

부품번호상세설명 및 기능제조사
BUF20820

18-Channel GAMMA VOLTAGE GENERATOR

Burr-Brown
Burr-Brown
BUF20820

18-Channel Gamma Voltage Generator with Two Programmable Vcom Channels (Rev. E)

Texas Instruments
Texas Instruments

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