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PDF ADD8701 Data sheet ( Hoja de datos )
| Número de pieza | ADD8701 | |
| Descripción | 12-Channel Gamma Buffers with VCOM Buffer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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12-Channel Gamma Buffers
with VCOM Buffer
ADD8701
FEATURES
Single-Supply Operation: 7 V to 16 V
Dual-Supply Operation: ؎3.5 V to ؎8 V
Supply Current: 13 mA Max
Upper/Lower Buffers Swing to VDD/GND
Continuous Output Current: 10 mA
VCOM Peak Output Current: 250 mA
Offset Voltage: 15 mV Max
Slew Rate: 6 V/s
Fast Settling Time with Large C-Load
APPLICATIONS
TFT LCD Panels
GENERAL DESCRIPTION
The ADD8701 is a low cost, 12-channel buffer amplifier and
VCOM driver that operates from a single supply. The part is
designed for high resolution TFT LCD panels, and is built on
an advanced, high voltage, CBCMOS process.
The buffers have high slew rate, 10 mA continuous output current,
and high capacitive load drive capability. The VCOM buffer has
increased drive of 35 mA and can drive large capacitive loads. The
ADD8701 offers wide supply range and offset voltages below 15 mV.
FUNCTIONAL BLOCK DIAGRAM
VDD 1
VCOM IN 2
IN12 3
IN11 4
IN10 5
IN9 6
IN8 7
IN7 8
32 31 30 26 28 27 26 25
24 GND
23 VDD
22 V6
21 V5
20 V4
19 V3
18 V2
17 V1
9 10 11 12 13 14 15 16
The ADD8701 is specified over the –40ºC to +85ºC tempera-
ture range and is available in a 32-lead lead frame chip scale
package (LFCSP).
All inputs and outputs incorporate internal ESD protection
circuits.
PANEL
TIMING
CONTROLLER
TIMING AND CONTROL
SCAN DRIVER CONTROL
GAMMA
REFERENCE
VOLTAGES
VDD
V12
SOURCE DRIVER
NO. 1
384
SOURCE DRIVER
NO. 2
384
SOURCE DRIVER
NO. 8
384
ADD8701
RESISTOR
LADDER
RGB
SCAN 768
DRIVERS
TFT COLOR PANEL
1024 ؋ 768
Figure 1. Typical SVGA TFT-LCD Application
VCOM OUT V1
VCOM IN
GND
VDD
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  
100
VDD = 16V
BUFFER 10
10
SINK
1
0.1
SOURCE
0.01
0.001
0.01
0.1 1
10
LOAD CURRENT – mA
100
TPC 10. Output Voltage to
Supply Rail vs. Load Current
100
VDD = 16V
BUFFERS 11, 12
10
SINK
1
0.1
SOURCE
0.01
0.001
0.01
0.1 1
10
LOAD CURRENT – mA
100
TPC 11. Output Voltage to
Supply Rail vs. Load Current
10
VDD = 16V
VCOM
1
0.1
0.01
ADD8701
SOURCE
SINK
0.001
0.0001
0.01
0.1 1 10
LOAD CURRENT – mA
100
TPC 12. Output Voltage to
Supply Rail vs. Load Current
12
VCM = 1/2 VDD
10
8
6
4
2
0
0 4 8 12 16
SUPPLY VOLTAGE – V
TPC 13. Supply Current vs.
Supply Voltage
12
VDD = 16V
10
8 VDD = 7V
6
4
2
0
–40
25
TEMPERATURE – ؇C
85
TPC 14. Supply Current vs.
Temperature
20
VDD = 16V
VCOM AND BUFFERS 1 TO 9
10
10k⍀
0 2k⍀
1k⍀
560⍀
–10
150⍀
–20
–30
100k
1M 10M 30M
FREQUENCY – Hz
TPC 15. Frequency Response
vs. Resistive Loading
20
VDD = 16V
BUFFERS 10 TO 12
10
0
–10
–20
10k⍀
2k⍀
1k⍀
560⍀
150⍀
–30
100k
1M 10M 30M
FREQUENCY – Hz
TPC 16. Frequency Response
vs. Resistive Loading
80
ALL CHANNELS
60 VDD = 8V
TA = +25؇C
40
20
0
–20
–40
PSRR
–60
–80
–100
–120
100
1k 10k 100k 1M
FREQUENCY – Hz
10M
TPC 17. Power Supply Rejection
Ratio vs. Frequency
20
VDD = 16V
10 VCOM, BUFFERS 1 TO 9
0
100pF
–10 50pF
540pF
–20
1040pF
–30
–40
–50
100k
1M 10M 30M
FREQUENCY – Hz
TPC 18. Frequency Response
vs. Capacitive Loading
REV. 0
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADD8701.PDF ] | |
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