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ADD8702ACP-REEL7 Fiches technique(PDF) 1 Page - Analog Devices

No de pièce ADD8702ACP-REEL7
Description  12-Channel Gamma Buffers with Vcom Buffer
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Site Internet  http://www.analog.com
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ADD8702ACP-REEL7 Fiches technique(HTML) 1 Page - Analog Devices

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Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
ADD8702
12-Channel Gamma Buffers
with VCOM Buffer
PANEL
TIMING
CONTROLLER
TIMING AND CONTROL
SCAN DRIVER CONTROL
GAMMA
REFERENCE
VOLTAGES
GAMMA
VCOM
R
384
SOURCE DRIVER
NO. 1
768
SCAN
DRIVERS
TFT COLOR PANEL
1024
768
384
SOURCE DRIVER
NO. 2
384
SOURCE DRIVER
NO. 8
ADD8702
G
B
Figure 1. Typical SVGA TFT LCD Application
FUNCTIONAL BLOCK DIAGRAM
GND
VDD
VGMA6
VGMA5
VGMA4
VGMA3
VGMA2
VGMA1
24
23
22
21
20
19
18
17
VDD
VCOM ADJ
VHIGH
VIN11
VIN10
VIN9
VIN8
VIN7
9
10
11
12
13
14
15
16
32
31
30
26
28
27
26
25
1
2
3
4
5
6
7
8
FEATURES
Programmable 12-Channel Gamma Reference Generator
Mask Programmable Adjustable VCOM Buffer
Upper/Lower Outputs Swing to VDD/GND
Continuous Output Current: 10 mA
VCOM Peak Output Current: 250 mA
Outputs with Fast Settling Time for Load Change
Output Pins Are Compatible with ADD8701
Single-Supply Operation: 7 V to 16 V
Supply Current: 15 mA Max
APPLICATIONS
TFT LCD Panels
GENERAL DESCRIPTION
The ADD8702 is a low cost, mask programmable, 12-channel
gamma reference generator, plus an adjustable VCOM driver. This
part is designed to provide gamma correction for high resolution
TFT LCD panels. The 12 gamma reference levels and VCOM are
mask programmable to 0.3% resolution using the on-chip 500
chain resistor string. This reduces component and board costs.
The ADD8702 provides a complete programmed set of gamma
voltage references for the LCD source drivers. These references
settle quickly to load change. The VCOM output is stable with
high capacitive loads and can source or sink 250 mA peak cur-
rent. The VCOM output level can be adjusted using an external
trim-potentiometer or discrete resistors.
The output pins are compatible with the ADD8701. This allows
for single board design and fast turns for prototyping using the
initial ADD8701 board design.
The ADD8702 is specified over the temperature range of –40
°C
to +85
°C and comes in the 32-lead lead frame chip scale pack-
age (LFCSP) for compact board space.


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