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PDF BUF11705 Data sheet ( Hoja de datos )
| Número de pieza | BUF11705 | |
| Descripción | Gamma Correction Buffer | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BUF11705 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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BUF11705
22-V Supply, 10+1 Channel
Gamma Correction Buffer
SBOS349 − DECEMBER 2005
www.DataSheet4U.com
FEATURES
D Wide Supply Range: 7 V to 22 V
D Gamma Correction Channels: 10
D Integrated VCOM Buffer
D Excellent Output Current Drive:
− Gamma Channels:
> 30 mA at 0.5 V Swing to Rails(1)
− VCOM:
> 100 mA typ at 2 V Swing to Rails(1)
D Large Capacitive Load Drive Capability
D Rail-to-Rail Output
D PowerPAD Package
D Low-Power/Channel: < 500 µA
D High ESD Rating: 8 kV HBM, 2 kV CDM,
300 V MM
D Specified for −25°C to +85°C
(1) See Typical Characteristic curves for details.
V DD
BUF117 05
So urce Driver
Gamma 1
DESCRIPTION
The BUF11705 is a multi-channel buffer targeted
towards gamma correction in high-resolution LCD
panels. It is pin-compatible with the existing BUF11702
and BUF11704 and operates at higher supply voltages
up to 22 V (24 V absolute max). The higher supply
voltage enables faster response times and brighter
images in large-screen LCD panels. This is especially
important in LCD TV applications.
The BUF11705 offers 10 gamma channels. For
additional space and cost savings, a VCOM channel with
> 100 mA drive capability is integrated into the
BUF11705.
The BUF11705 is available in the TSSOP-28,
PowerPAD package for dramatically increased power
dissipation capability. This allows, a large number of
channels to be handled safely in one package.
A flow-through pinout has been adopted to allow
simple PCB routing and maintain cost-effectiveness. All
inputs and outputs of the BUF11705 incorporate
internal ESD protection circuits that prevent functional
failures at voltages up to 8 kV (HBM), 2 kV (CDM), and
300 V (MM).
Gamma 2
Gamma 3
Gamma (n − 2)
Gamma (n − 1)
Gamma (n)
VCOM
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. 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, Texas Instruments Incorporated
www.ti.com
1 page  
www.ti.com
TYPICAL CHARACTERISTICS
Over operating free-air temperature range, unless otherwise noted.
DC CURVES
INPUT OFFSET VOLTAGE vs INPUT VOLTAGE
20
VS = 18 V
15 Channels 1−5
10
5
0
−5
−10
−15
−20
0
3 6 9 12 15
VIN − Input Voltage − V
Figure 1
18
INPUT OFFSET VOLTAGE vs INPUT VOLTAGE
20
Channels VCOM
15 VS = 18 V
10
5
0
−5
−10
−15
−20
0
3 6 9 12 15
VIN − Input Voltage − V
Figure 3
18
OUTPUT VOLTAGE vs OUTPUT CURRENT
18
16
14 VDD = 18 V
Channels 1−5
12
10
+25_C
−10_ C
+85_ C
8
+25_C
6
4
2
−10_ C
0
0 10 20 30 40 50 60 70 80 90 100
IO − Output Current − mA
Figure 5
BUF11705
SBOS349 − DECEMBER 2005
INPUT OFFSET VOLTAGE vs INPUT VOLTAGE
20
VS = 18 V
15 Channels 6−10
10
5
0
−5
−10
−15
−20
0
3 6 9 12 15
VIN − Input Voltage − V
Figure 2
18
INPUT BIAS CURRENT vs FREE−AIR TEMPERATURE
250
200
150
100
50
0
0 10 20 30 40 50 60 70 80 85
TA − Free−Air Temperature − _C
Figure 4
18.0
17.8
17.6
HIGH−LEVEL OUTPUT VOLTAGE vs
HIGH−LEVEL OUTPUT CURRENT
TA = −10_ C
TA = +25_ C
17.4
17.2
VDD = 18 V
Channels 1−5
TA = +85_ C
17.0
0 5 10 15 20 25 30 35 40 45 50
IOH − High−Level Output Current − mA
Figure 6
5
5 Page 
BUF11705
www.ti.com
CAPACITIVE LOAD DRIVE
The BUF11705 has been designed to sink/source large
dc currents. Its output stage has been designed to
deliver output current transients with little disturbance
of the output voltage. However, there are times when
very fast current pulses are required. Therefore, in LCD
source driver buffer applications, it is quite normal for
capacitors to be placed at the outputs of the reference
buffers. These capacitors improve the transient load
regulation and will typically have values of 100pF or
more. The BUF11705 gamma buffers were designed to
drive capacitances in excess of 100 pF. The output is
able to swing within 150 mV of the rails on
10 mA of output current, as shown in Figure 24.
OUTPUT VOLTAGE vs OUTPUT CURRENT
18.0
17.8
Channels 1−5
17.6
VDD = 18 V
TA = 25_C
17.4
17.2
17.0
1.0
0.8
0.6
0.4
Channels 6−10
0.2
0
0 5 10 15 20 25 30 35 40 45 50
Output Current − mA
Figure 24. Gamma Buffer Drive Capability
SBOS349 − DECEMBER 2005
APPLICATIONS WITH >10 GAMMA CHANNELS
When a greater number of gamma correction channels
are required, two or more BUF11705 devices can be
used in parallel, as shown in Figure 25. This capability
provides a cost-effective way of creating more refer-
ence voltages over the use of quad-channel op amps or
buffers. The suggested configuration in Figure 25
simplifies layout. The various different channel versions
provide a high degree of flexibility and also minimize
total cost and space.
BUF11705
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
OUT16
OUT17
OUT18
OUT19
OUT20
BUF11705
GMA1
2
3
4
5
6
7
8
9
GMA10
GMA11
12
13
14
15
16
17
18
19
GMA20
Figure 25. Creating > 10 Gamma Voltage
Channels
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BUF11705.PDF ] | |
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