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ADD8702

Description
12-Channel Gamma Buffers with Vcom Buffer
File Size152KB,8 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Compare View All

ADD8702 Overview

12-Channel Gamma Buffers with Vcom Buffer

12-Channel Gamma Buffers
with V
COM
Buffer
ADD8702
FEATURES
Programmable 12-Channel Gamma Reference Generator
Mask Programmable Adjustable V
COM
Buffer
Upper/Lower Outputs Swing to V
DD
/GND
Continuous Output Current: 10 mA
V
COM
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
FUNCTIONAL BLOCK DIAGRAM
V
COM
OUT
VGMA12
VGMA11
VGMA10
VGMA9
VGMA8
26
32
31
30
26
28
27
25
24
GND
23
V
DD
22
VGMA6
21
VGMA5
20
VGMA4
19
VGMA3
18
VGMA2
17
VGMA1
V
DD
V
COM
ADJ
V
HIGH
V
IN
11
V
IN
10
V
IN
9
V
IN
8
V
IN
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V
LOW
V
IN
6
V
IN
5
V
IN
4
V
IN
3
V
IN
2
V
DD
The ADD8702 is a low cost, mask programmable, 12-channel
gamma reference generator, plus an adjustable V
COM
driver. This
part is designed to provide gamma correction for high resolution
TFT LCD panels. The 12 gamma reference levels and V
COM
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 V
COM
output is stable with
high capacitive loads and can source or sink 250 mA peak cur-
rent. The V
COM
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.
PANEL
TIMING
CONTROLLER
ADD8702
TIMING AND CONTROL
GAMMA
REFERENCE
VOLTAGES
GAMMA
V
COM
SCAN DRIVER CONTROL
SOURCE DRIVER
NO. 1
384
SOURCE DRIVER
NO. 2
384
SOURCE DRIVER
NO. 8
384
R G B
SCAN
DRIVERS
768
TFT COLOR PANEL
1024 768
Figure 1. Typical SVGA TFT LCD Application
REV. 0
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.
GND
GENERAL DESCRIPTION
VGMA7
GND

ADD8702 Related Products

ADD8702 ADD8702ACP-R2 ADD8702ACP-REEL ADD8702ACP-REEL7
Description 12-Channel Gamma Buffers with Vcom Buffer 12-Channel Gamma Buffers with Vcom Buffer 12-Channel Gamma Buffers with Vcom Buffer 12-Channel Gamma Buffers with Vcom Buffer

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