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參數(shù)資料
| 型號(hào)： | ADD8701ACP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 12-Channel Gamma Buffers with VCOM Buffer |
| 中文描述： | 12 BUFFER AMPLIFIER, QCC32 |
| 封裝： | MO-220-VHHD-2, LFCSP-32 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 289K |
| 代理商： | ADD8701ACP |
REV. 0
ADD8701
–7–
V
V
= 16V
BUFFERS 10 TO 12
MARKER SET @ 10kHz
MARKER READING = 36.6nV/ Hz
FREQUENCY – Hz
0
5
10
15
20
25
–10
0
10
20
30
40
50
60
70
TPC 29. Voltage Noise Density
vs. Frequency
V
V
= 16V
VCOM AND BUFFERS 1 TO 9
MARKER SET @ 10kHz
MARKER READING = 25.7nV/ Hz
FREQUENCY – Hz
0
5
10
15
20
25
–10
0
10
20
30
40
50
60
70
TPC 28. Voltage Noise Density
vs. Frequency
APPLICATIONS
LCD Gamma Reference Buffers
In high resolution TFT-LCD displays, gamma correction must
be performed to correct the nonlinearity in the LCD panel’s
transmission characteristics. A typical TFT-LCD panel consisting
of 256 grayscale levels takes an 8-bit digital word to select an
appropriate gamma reference voltage. An 8-bit source driver may
use 12 analog voltages that match the characteristic gamma curve
for optimum panel picture quality. The ADD8701 is specifically
designed to generate analog reference voltages to meet the gamma
characteristics of an LCD panel used by the source driver. The
gamma reference buffers offer 10 mA drive capability.
The ADD8701 is designed to meet the rail-to-rail capability
needed by the application and yet offers a low cost-per-channel
solution. The design maximizes the die area by offering channels
to swing to the positive and negative rails. It is imperative that
the channels swinging close to the supply rail be used for the
positive gamma references and that the channels swinging close
to GND be used for the negative gamma references. See Figure 2
for an example of the application circuit.
LCD VCOM Buffer
The output of the VCOM buffer is designed to control the voltage
on the back plate of the LCD display. The buffer must be capable
of sinking and sourcing capacitive pulse current. The amplifier
stability is designed for high load capacitance. A high quality
ceramic capacitor is recommended to supply short duration current
pulses at the output. The VCOM buffer of the ADD8701 can
handle up to 35 mA of continuous output current and can drive
up to 1,000 nF of pure capacitive load.
Unused Buffers
Inputs of any unused buffer should be tied to the ground plane.
P
GMA
A12
GMA
A11
GMA
A10
GMA
A9
GMA
A8
GMA
A7
GMA
A6
GMA
A5
GMA
A4
GMA
A3
GMA
A2
GMA
A1
ADD8701
LCD SOURCE DRIVER
N
Figure 2. Application Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADD8702ACP-R2 | 12-Channel Gamma Buffers with Vcom Buffer |
| ADD8702 | 12-Channel Gamma Buffers with Vcom Buffer |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADD8701ACP-R2 | 制造商:Analog Devices 功能描述:Gamma Buffer 32-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:GAMMA BFFR 32LFCSP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:13 CHANNEL BUFFER - Bulk |
| ADD8701ACP-REEL7 | 制造商:Analog Devices 功能描述:Gamma Buffer 32-Pin LFCSP EP T/R 制造商:Rochester Electronics LLC 功能描述:13 CHANNEL BUFFER - Tape and Reel |
| ADD8702 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Channel Gamma Buffers with Vcom Buffer |
| 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 |
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