ADD8702ACP-REEL7 AD [Analog Devices], ADD8702ACP-REEL7 Datasheet

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ADD8702ACP-REEL7

Manufacturer Part Number
ADD8702ACP-REEL7
Description
12-Channel Gamma Buffers with Vcom Buffer
Manufacturer
AD [Analog Devices]
Datasheet
1.ADD8702ACP-REEL7.pdf (8 pages)
GENERAL DESCRIPTION
The ADD8702 is a low cost, mask programmable, 12-channel
gamma reference generator, plus an adjustable V
part is designed to provide gamma correction for high resolution
TFT LCD panels. The 12 gamma reference levels and V
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
high capacitive loads and can source or sink 250 mA peak cur-
rent. The V
trim-potentiometer or discrete resistors.
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.
FEATURES
Programmable 12-Channel Gamma Reference Generator
Mask Programmable Adjustable V
Upper/Lower Outputs Swing to V
Continuous Output Current: 10 mA
V
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
COM
Peak Output Current: 250 mA
COM
output level can be adjusted using an external
CONTROLLER
TIMING
PANEL
SCAN DRIVER CONTROL
DRIVERS
SCAN
TIMING AND CONTROL
COM
768
DD
COM
output is stable with
SOURCE DRIVER
R
Figure 1. Typical SVGA TFT LCD Application
/GND
G B
Buffer
NO. 1
384
COM
driver. This
COM
are
TFT COLOR PANEL
SOURCE DRIVER
1024
NO. 2
384
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
768
12-Channel Gamma Buffers
V
COM
V
V
V
HIGH
V
V
V
ADJ
V
IN
IN
IN
IN
IN
FUNCTIONAL BLOCK DIAGRAM
DD
11
10
9
8
7
SOURCE DRIVER
1
2
3
4
5
6
7
8
NO. 8
384
© 2003 Analog Devices, Inc. All rights reserved.
32
REFERENCE
9
VOLTAGES
GAMMA
31
10
30
11
26
12
with V
28
13
27
14
ADD8702
GAMMA
26
15
V
COM
ADD8702
25
16
COM
www.analog.com
24
23
22
21
20
19
18
17
GND
V
VGMA6
VGMA5
VGMA4
VGMA3
VGMA2
VGMA1
Buffer
DD

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ADD8702ACP-REEL7 Summary of contents

Page 1

FEATURES Programmable 12-Channel Gamma Reference Generator Mask Programmable Adjustable V Upper/Lower Outputs Swing to V Continuous Output Current Peak Output Current: 250 mA COM Outputs with Fast Settling Time for Load Change Output Pins Are Compatible with ...

Page 2

ADD8702–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter Symbol OUTPUT ACCURACY V ERROR V SYSTEM MASK PROGRAMMABLE RESISTOR STRING Total Resistor String R Resistor Matching R OUTPUT CHARACTERISTICS Output Voltage High V (VGMA11, VGMA12) Output Voltage Mid V (VGMA3 to VGMA10) Output Voltage Low ...

Page 3

... This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Model ADD8702ACP-R2 ADD8702ACP-REEL ADD8702ACP-REEL7 Pin No 4–13 14 16, 24, 31 17– ...

Page 4

ADD8702–Typical Performance Characteristics SUPPLY VOLTAGE (V) TPC 1. Supply Current vs. Supply Voltage 16V DD GAMMA ...

Page 5

V = 16V 10k 100pF L TIME (2 s/DIV) TPC 10. Large Signal Transient Response 16V DD 10 GAMMA = 120pF 7 320pF ...

Page 6

ADD8702 6,000 V = 16V 5,000 ALL CHANNELS 4,000 3,000 2,000 1,000 0 –22 –14 – OUTPUT VOLTAGE ERROR (mV) TPC 19. Output Voltage Error Distribution ...

Page 7

APPLICATIONS Figure block diagram of the configuration of an XGA- compatible (1024 768) TFT color panel with the ADD8702 providing gamma correction reference voltages to the source drivers and an integrated V driver for LCD common node. ...

Page 8

ADD8702 PIN 1 INDICATOR 12 MAX 1.00 0.90 0.80 SEATING PLANE OUTLINE DIMENSIONS 32-Lead Lead Frame Chip Scale Package [LFCSP] (CP-32) Dimensions shown in millimeters 5.00 BSC SQ 0.60 MAX 24 0.50 BSC 4.75 TOP BSC SQ VIEW 0.50 0.40 ...

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