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參數(shù)資料
| 型號(hào)： | LMC6009MTX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 緩沖放大器 |
| 英文描述： | 9 Channel Buffer Amplifier for TFT-LCD |
| 中文描述： | 9 BUFFER AMPLIFIER, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 115K |
| 代理商： | LMC6009MTX |
Applications
(Continued)
Example:
Below is a calculation of pixel charge time (for a
black to black transition) in a VGA display operating at a ver-
tical refresh rate of 60 Hz, with a panel capacitance of 50 pF
per sub-pixel:
A full black to black transition represents the maximum
charging time for the panel, since it requires that the panel
capacitance be driven by a 4V swing from node V
REF1
(Figure 7).
Total capacitive load presented to the LMC6009 is
C
L
= 50 pF x 3 x 640 = 96 nF
Output current of the LMC6009 is:
I
SC
= 80 mA
Hence, slew time t
SLEW
= (96 nF x 4V)/80 mA = 3.07 μs
The total line time for a VGA system is approximately 34 μs.
Therefore, the LMC6009 easily meets the drive require-
ments for the application. The input resistance seen between
the V
REFn
and V
REF(n+1)
inputs, (where n = 0 thru 8) of the
Column Driver (Figure 7) also draw current from the
LMC6009. Thus, the actual current available for charging the
panel capacitance is:
Ipx = 80 mA - (V
VREF1
–V
VREF2
)/R
CD
where
V
V REFn
= Voltage at node V
REFn
,
V
VREF(n+1)
= Voltage at node V
REF(n+1)
, and
R
CD
= Column driver input resistance between
VREFn and VREF(n+1)
Since the LMC6009 is capable of sourcing 80 mA, the pixel
charging time is primarily limited only by the length of the
R
. C
time constant. To implement a high quality display,
column drivers that allow the shortest possible time constant
(lower values of R
) are desirable. However, lower values
of R
result in increased system quiescent power dissipa-
tion. It is therefore important to optimize system performance
by carefully considering speed vs power tradeoffs.
DS012533-7
FIGURE 7.
www.national.com
6
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| LMC6022 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power CMOS Dual Operational Amplifier |
| LMC6022IM | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6022IM/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6022IMX | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6022IMX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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