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| 型号： | BUF20820AIDCPRE4 |
| 厂商： | Texas Instruments |
| 文件页数： | 8/29页 |
| 文件大小： | 0K |
| 描述： | IC 18CH PROG V-REF GEN 38-HTSSOP |
| 标准包装： | 2,000 |
| 应用： | TFT-LCD 面板：伽玛缓冲器，VCOM 驱动器 |
| 输出类型： | 满摆幅 |
| 电路数： | 18 |
| 电流 - 电源： | 18mA |
| 电流 - 输出 / 通道： | 100mA |
| 电压 - 电源，单路/双路(±)： | 7 V ~ 18 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP （0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 38-HTSSOP |
| 包装： | 带卷 (TR) |
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BUF20820
SBOS330E DECEMBER 2005 REVISED OCTOBER 2008
www.ti.com
16
REPLACEMENT OF TRADITIONAL GAMMA
BUFFER
Traditional gamma buffers rely on a resistor string (often
using expensive 0.1% resistors) to set the gamma
voltages. During development, the optimization of these
gamma voltages can be time consuming. Programming
these
gamma
voltages
with
the
BUF20820
can
significantly reduce the time required for gamma voltage
optimization. The final gamma values can be written into
the internal OTP memory to replace a traditional gamma
buffer solution. Figure 13a shows the traditional resistor
string approach; Figure 13b shows the more efficient
alternative method using the BUF20820.
The BUF20820 uses the most advanced high-voltage
CMOS process available today, which allows it to be
competitive with traditional gamma buffers.
Programmability offers the following advantages:
D It shortens development time significantly.
D It eliminates manufacturing variance between panels.
D It allows a single panel to be built for multiple
customers, with loading of customer-dependent
gamma
curves
during
final
production.
This
significantly lowers inventory cost and risk and
simplifies inventory management.
D It allows demonstration of various gamma curves to
LCD monitor makers by simply uploading a different
set of gamma values.
D It provides a simple means of adjusting gamma curves
during final production improve picture quality and
accommodate changes in the panel manufacturing
process or end-customer requirements.
D It decreases cost and space.
BUFxx704
a) Traditional
b) BUF20820 Solution
PC
SDA
SCL
SDA
SCL
Timing
Controller
LCD Panel Electronics
BUF20820
R
egi
s
te
r
Control Interface
Gamma
References
OUT1
OUT2
OUT17
OUT18
V
COM
V
COM OUT1
V
COM OUT2
Figure 13. Replacement of the Traditional Gamma Buffer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BUF20820EVM | 功能描述:放大器 IC 开发工具 BUF20800-BUF20820 Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| BUF22821 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory |
| BUF22821AIDCPR | 功能描述:LCD Gamma缓冲器 Prgrmbl Gam-Vltg Gen & Vcom Calibrator RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
| BUF22821EVM | 功能描述:放大器 IC 开发工具 BUF22821EVM Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| BUF22821EVM-USB | 功能描述:放大器 IC 开发工具 BUF22821 Eval board Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
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