- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375253 > ADD8702 (Analog Devices, Inc.) 12-Channel Gamma Buffers with Vcom Buffer PDF資料下載
參數(shù)資料
| 型號(hào)： | ADD8702 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Channel Gamma Buffers with Vcom Buffer |
| 中文描述： | 12通道伽馬緩沖器，具有VCOM緩沖器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 233K |
| 代理商： | ADD8702 |
REV. 0
ADD8702
–7–
APPLICATIONS
Figure 1 is a 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
COM
driver for LCD common node.
BUFFER
16V
R
NULL
C
T
R
L
Figure 2. Bandwidth Measurement Information
Panel size and resolution determine the number of gamma
reference voltages required. For a 256-grayscale level, 8-bit color
scheme, 6 2 external reference nodes should be sufficient to
match the characteristics of the LCD driver to the characteristics
of the actual LCD panel for improved picture quality. External
reference gamma correction voltages are often generated using
a simple resistor ladder. Using the ADD8702, the resistor
ladder is incorporated in the IC for reduced cost and number
of components.
BUFFER
16V
5V
33
1k
10V
5V
0V
0.1 s
V
TH
V
TH
Figure 3. Transient Load Regulation Test Circuit
The ADD8702 is designed to meet the rail-to-rail capability
needed by the application, yet offers the lowest cost per channel
solution. The ADD8702 gamma buffers offer 10 mA continuous
drive current capability. To be more competitive, the design
maximizes the die area by
allowing specific channels to swing to
the positive rail and negative rail. So it is imperative that the
channels swinging close to the supply rail be used for the posi-
tive gamma references and the channels swinging close to GND
be used for the negative gamma references. The V
COM
buffer can
handle up to 35 mA continuous output current and can drive up
to 1,000 pF pure capacitive load. Provision is available to adjust
the V
COM
voltage to a desired level. Refer to Figure 4 for an
example of an application circuit for adjusting the output of the
V
COM
buffer.
P
GMA 12
GMA 11
GMA 10
GMA 9
GMA 8
GMA 7
GMA 6
GMA 5
GMA 4
GMA 3
GMA 2
GMA 1
ADD8702
LCD SOURCE DRIVER
N
A1
LCD COMMON PLANE
V
COM
AMP
2k
32k
V
DD
GND
V
COM
ADJUST
A5
A4
A3
A2
A10
A8
A7
A6
A9
A12
A11
V
LOW
V
IN
5
V
IN
4
V
IN
3
V
IN
2
V
IN
10
V
IN
8
V
IN
7
V
IN
6
V
IN
9
V
HIGH
V
IN
11
Figure 4. Application Circuit
Table I. ADD8702 – 000 Mask Option, Resistor Tap Points
(0
≤
≤
500) V
DD
= 12.5 V, V
HIGH
= 12.5 V, and V
LOW
= GND
Tap Point ( )
Voltage
Unit
VGMA1
VGMA2
VGMA3
VGMA4
VGMA5
VGMA6
VGMA7
VGMA8
VGMA9
VGMA10
VGMA11
VGMA12
V
COM
8
57
84
115
139
194
218
298
371
418
442
488
200
0.2
1.43
2.11
2.89
3.48
4.86
5.45
7.45
9.29
10.45
11.04
12.2
5
V
V
V
V
V
V
V
V
V
V
V
V
V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADD8702ACP-REEL | 12-Channel Gamma Buffers with Vcom Buffer |
| ADD8702ACP-REEL7 | 12-Channel Gamma Buffers with Vcom Buffer |
| ADD8754 | LCD Panel Power, VCOM, and Gate Modulation |
| ADD8754ACPZ-REEL | LCD Panel Power, VCOM, and Gate Modulation |
| ADD8754ACPZ-REEL7 | LCD Panel Power, VCOM, and Gate Modulation |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADD8702ACP-R2 | 制造商:Analog Devices 功能描述:12-CHANNEL GAMMA BUFFERS WITH VCOM BUFFER 制造商:Rochester Electronics LLC 功能描述:13 CHANNEL BUFFER - Bulk |
| ADD8702ACP-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Channel Gamma Buffers with Vcom Buffer |
| ADD8702ACP-REEL7 | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADD8704 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16 V Quad Operational Amplifier |
| ADD8704ACPZ-R2 | 制造商:Rochester Electronics LLC 功能描述:16V QUAD OP AMP FOR LCD - Bulk 制造商:Analog Devices 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。