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PDF ADD8702 Data sheet ( Hoja de datos )
| Número de pieza | ADD8702 | |
| Descripción | 12-Channel Gamma Buffers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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12-Channel Gamma Buffers
with VCOM Buffer
ADD8702
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
www.DataSheet4US.cinomgle-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.
FUNCTIONAL BLOCK DIAGRAM
VDD
VCOM ADJ
VHIGH
VIN11
VIN10
VIN9
VIN8
VIN7
1
2
3
4
5
6
7
8
32 31 30 26 28 27 26 25
9 10 11 12 13 14 15 16
24 GND
23 VDD
22 VGMA6
21 VGMA5
20 VGMA4
19 VGMA3
18 VGMA2
17 VGMA1
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
TIMING AND CONTROL
SCAN DRIVER CONTROL
GAMMA
REFERENCE
VOLTAGES
SOURCE DRIVER
NO. 1
384
SCAN
DRIVERS
768
RGB
SOURCE DRIVER
NO. 2
384
TFT COLOR PANEL
1024 ؋ 768
SOURCE DRIVER
NO. 8
384
Figure 1. Typical SVGA TFT LCD Application
ADD8702
GAMMA
VCOM
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.
1 page  
VDD = 16V
RL = 10k⍀
CL = 100pF
TIME (2s/DIV)
www.DataSheet4UT.cPoCm10. Large Signal Transient
Response
16
VDD = 16V
14 RNULL = 33⍀
CL = 100pF
12
10
VCOM SLEW RATE FALLING
8
VCOM SLEW RATE RISING
6
4
2
0
–40
25
TEMPERATURE (؇C)
85
TPC 11. Slew Rate vs. Temperature
11
10
9
8
7
6
5
4
3
2
1
0
–200
120pF
320pF
520pF
VDD = 16V
GAMMA = 2
1F 10F
200 600 1,000 1,400 1,800
TIME (ns)
TPC 13. Transient Load
Response vs. Capacitive Load
11
10
VDD = 16V
GAMMA = 11
9
8
320pF
7
120pF
6
1F 10F
5
4 520pF
3
2
1
0
–200
200
600 1,000 1,400 1,800
TIME (ns)
TPC 14. Transient Load
Response vs. Capacitive Load
100
VDD = 16V
90 GAMMA 1 TO 9
80
70
60
50
SINK
40
30
SOURCE
20
10
0
0.001 0.01 0.1 1 10
LOAD CURRENT (mA)
TPC 16. Output Voltage
Error vs. Load Current
100
1,400
VDD = 16V
GAMMA 10 TO 12
1,200
1,000
SINK
800
600
400
200 SOURCE
0
0.001 0.01 0.1 1 10
LOAD CURRENT (mA)
TPC 17. Output Voltage
Error vs. Load Current
100
ADD8702
7V < V DD < 16V
RNULL = 33⍀
CL = 0.1F
TIME (20s/DIV)
TPC 12. Small Signal Transient
Response
11
10
9
8
7
6
5
4
3
2
1
0
–200
120pF
320pF
520pF
VDD = 16V
VCOM
1F 10F
200 600 1,000 1,400 1,800
TIME (ns)
TPC 15. Transient Load
Response vs. Capacitive Load
50
VDD = 16V
45 VCOM
40
35
30
25
20
SOURCE
15
10
SINK
5
0
0.001 0.01 0.1 1 10
LOAD CURRENT (mA)
100
TPC 18. Output Voltage
Error vs. Load Current
REV. 0
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADD8702.PDF ] | |
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