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ADD8701 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADD8701
Beschreibung 12-Channel Gamma Buffers with VCOM Buffer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
ADD8701 Datasheet, Funktion
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.






ADD8701 Datasheet, Funktion
ADD8701
20
VDD = 16V
10 BUFFERS 10 TO 12
0
100pF
–10 50pF
–20 540pF
–30 1040pF
–40
–50
100k
1M 10M 30M
FREQUENCY – Hz
TPC 19. Frequency Response
vs. Capacitive Loading
180
VDD = 7V
160 RL = 2k
CHANNELS 11 AND 12
140
VCOM
CHANNELS 3 TO 9
120
CHANNELS 1 AND 2
100
80
60
40
0 200 400 600 800 1,000 1,200
CAPACITIVE LOAD – pF
TPC 20. Input-Output Phase
Shift vs. Capacitive Load
VDD = 16V
TIME – 2s/DIV
TPC 22. 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 23. Slew Rate vs. Temperature
100
90
VDD = 8V
VIN = 50mV
80 RL = 2k
TA = 25؇C
70
60
50
–OS +OS
40
30
20
10
0
10 100 1k
CAPACITIVE LOAD – pF
10k
TPC 25. Small-Signal Overshoot
vs. Capacitive Load
12
VCOM
VDD = 8V
8 RL = 5k
CL = 100pF
4
RNULL = 33
TA = 25؇C
0
+tS (0.1%)
–4
–tS (0.1%)
–8
–12
400
600 800 1,000 1,200 1,400
SETTLING TIME – ns
TPC 26. Settling Time vs. Step Size
180
VDD = 16V
160 RL = 2k
CHANNEL 11
140
VCOM
CHANNEL 3
120
CHANNEL 1
100
80
60
40
0 200 400 600 800 1,000 1,200
CAPACITIVE LOAD – pF
TPC 21. Input-Output Phase
Shift vs. Capacitive Load
7V < VDD < 16V
ROUT SERIES = 33
CLOAD = 0.1F
TIME – 20s/DIV
TPC 24. Small Signal Transient
Response
TIME – 40s/DIV
TPC 27. No Phase Reversal
–6– REV. 0

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