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PDF BUF20800 Data sheet ( Hoja de datos )
| Número de pieza | BUF20800 | |
| Descripción | 18-Channel GAMMA VOLTAGE GENERATOR | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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BUF20800
SBOS329D − JUNE 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 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
Analog
(7V to 18V)
Digital
(2.0V to 5.5V) REFH
BUF20800
REFH OUT
VCO M OUT1
VCO M OUT2
OUT 1
OUT 2
18 Output Channels plus
Two VCOM Channels
OUT 17
SDA
SCL
Control IF
LD AO
REFL
OUT 18
REFL OUT
APPLICATIONS
D REPLACES RESISTOR-BASED GAMMA
SOLUTIONS
D TFT-LCD REFERENCE DRIVERS
D DYNAMIC GAMMA CONTROL
DESCRIPTION
The BUF20800 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.
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 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 offers a high-speed
mode that allows clock speeds up to 3.4MHz.
For lower channel count, please contact your local sales
or marketing representative.
The BUF20800 is available in an HTSSOP-38
PowerPAD package. It is specified from −40°C to +85°C.
BUF20800 RELATED PRODUCTS
FEATURES
18-Channel Programmable, Two VCOM + OTP Memory
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
BUF20820
BUF12800
BUF01900
BUFxx704
SN10501
TPS65100
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
1 page  
BUF20800
www.ti.com
SBOS329D − JUNE 2005 − REVISED OCTOBER 2006
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = 18V, VSD = 5V, VREFH = 17V, VREFL = 1V, RL = 1.5kΩ connected to ground, and CL = 200pF, unless otherwise noted.
ANALOG SUPPLY CURRENT vs TEMPERATURE
16
VS = 18V
14
12 VS = 10V
10
8
6
4
2
0
−40 −20
0
20 40 60 80 100
Temperature (_ C)
Figure 1
FULL−SCALE OUTPUT SWING
REFH = 17V
REFL = 1V
Code 3FF →000
Code 000 →3FF
Time (1µs/div)
Figure 3
INTEGRAL NONLINEARITY ERROR vs INPUT CODE
0.6
0.4
0.2
0
−0.2
−0.4
−0.6
0
200 400 600 800 1000
Input Code
Figure 5
DIGITAL SUPPLY CURRENT vs TEMPERATURE
30
VS = 5V
25
20
VS = 3.3V
15
10
5
0
−40 −20
0
20
40 60
80 100
Temperature (_ C)
Figure 2
OUTPUT VOLTAGE vs OUTPUT CURRENT
18
17
16 OUT10−18 (sourcing), Code = 3FFh
VREFL = 0.2V, VREFH = 17V
15 RLOAD Connected to GND
OUT1−9, VCOM1−2 (sourcing)
Code = 3FFh
3 OUT1−9, VCOM1−2 (sinking)
Code = 000h
2 VREFL = 1V, VREFH = 17.8V
RLOAD Connected to 18V
1
VREFL = 1V, VREFH = 17.8V
RLOAD Connected to GND
OUT10−18 (sinking), Code = 000h
VREFL = 0.2V, VREFH = 17V
RLOAD Connected to 18V
0
0 10 20 30 40 50 60 70 80 90 100
Output Current (mA)
Figure 4
DIFFERENTIAL NONLINEARITY ERROR vs INPUT CODE
0.6
0.4
0.2
0
−0.2
−0.4
−0.6
0
200 400 600 800 1000
Input Code
Figure 6
5
5 Page 
www.ti.com
BUF20800
SBOS329D − JUNE 2005 − REVISED OCTOBER 2006
a. Write Single DAC
b. Write Multiple DACs
Figure 9. Timing Diagram for Write DAC Register
11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet BUF20800.PDF ] | |
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